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MC9RS08KA1CDBR - 8-bit RS08 MCU, 1KB Flash, 6-DFN | NXP (Tape & Reel)
MC9RS08KA1CDBR

MC9RS08KA1CDBR - 8-bit RS08 MCU, 1KB Flash, 6-DFN | NXP (Tape & Reel)

The NXP MC9RS08KA1CDBR is an 8-bit RS08-core microcontroller with 1KB of flash memory, 128 bytes of RAM, an integrated analog comparator, and 6 general-purpose I/O pins, housed in a 6-DFN exposed-pad (3x3 mm) package and operating at up to 10 MHz. An entry-level 8-bit microcontroller (MCU) is the smallest class of programmable system-on-chip: it combines a processor core, program flash, data RAM, clock generation, reset supervision, and a few peripherals on one die. Within the hierarchy of embedded processors - MCU -> microcontroller unit -> embedded IC -> semiconductor - ultra-low-end MCUs like the RS08KA family target applications where a discrete logic solution would otherwise be used, replacing glue logic and analog timers with reprogrammable silicon at a comparable cost. Key features include the simplified S08-derived RS08 instruction set with high-performance LDA, STA, and CLR instructions, 1KB of on-chip flash (self-programmable), an analog comparator (ACMP), low-voltage inhibit (LVI) and power-on reset (POR) supervision, and multiple low-power modes. Supply operation spans 2.5V, 3.3V, and 5V rails, which simplifies integration into both legacy 5V systems and modern 3.3V designs. Architecturally, the RS08 core is a cost-reduced derivative of the industry-proven S08 (HC08 lineage) core from Freescale Semiconductor, now part of NXP Semiconductors. CISC-style addressing keeps code density high, important when program space is only 1KB. System protection features - COP watchdog, LVI, and POR - reduce external component count in cost-sensitive appliances and small consumer products. Typical applications include small appliance control, LED lighting and dimming, battery charger supervision, timer and sequencer replacement, and simple human-interface functions in cost-driven consumer electronics. The 3x3 mm 6-DFN footprint suits extremely space-constrained boards. Design consideration: this part is End-of-Life per the NXP product page, so new designs should verify remaining supply or plan a migration path; the 6-DFN footprint is shared with the pin-compatible MC9RS08KA2CDB, which doubles flash to 2KB. This page synthesizes distributor pricing, drop-in alternative data, lifecycle status, and practical design notes not found in the manufacturer datasheet alone.

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MC9RS08KA1CPC - 8-bit RS08 MCU, 1KB Flash, 10MHz, DIP-8 | NXP
MC9RS08KA1CPC

MC9RS08KA1CPC - 8-bit RS08 MCU, 1KB Flash, 10MHz, DIP-8 | NXP

The NXP MC9RS08KA1CPC is an 8-bit RS08 microcontroller with 1KB of Flash program memory, 63 bytes of RAM, and an integrated analog comparator, housed in an 8-pin PDIP (DIP-8) through-hole package. It runs at 10MHz internal bus frequency from a 1.8V to 5.5V supply and provides 4 general-purpose I/O pins plus dedicated reset and ACMP pins. An RS08 microcontroller is a reduced-instruction 8-bit core derived from the Freescale/NXP S08 family, optimized for ultra-low-cost, ultra-low-power embedded applications. It is part of the broader 8-bit MCU hierarchy (8-bit microcontroller -> microcontroller unit -> embedded controller -> semiconductor) and shares the HCS08 instruction set with the LDA, STA, and CLR extensions. Compared with the older HC08, RS08 cuts die area and cost while preserving the S08 peripheral ecosystem, making it suited for appliances, toys, lighting controllers, and battery-powered sensor nodes. Key features include 1KB Flash, 63-byte RAM, an internal clock source with trim, brown-out and low-voltage detect (LVD/POR), a watchdog timer, an on-chip analog comparator, and multiple STOP/WAIT low-power states. The internal oscillator eliminates the need for an external crystal in most designs, reducing BOM cost and PCB area in cost-sensitive products. Typical applications include low-end consumer white goods, remote-control transmitters, LED drivers, battery chargers, and simple sensor readouts. The DIP-8 package and wide operating range make it especially attractive for hobbyist, educational, and legacy-replacement designs where through-hole mounting is preferred for hand-prototyping or repair work. When designing with this device, ensure the supply stays within 1.8V-5.5V and that the I/O pins do not exceed their source/sink ratings. The internal analog comparator allows reaction to external analog signals without an external op-amp, simplifying BOM in cost-sensitive products.

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MC9RS08KA1CSC - 8-Bit RS08 MCU, 1KB Flash, SOIC-8 | NXP
MC9RS08KA1CSC

MC9RS08KA1CSC - 8-Bit RS08 MCU, 1KB Flash, SOIC-8 | NXP

The NXP Semiconductors MC9RS08KA1CSC is an 8-bit RS08KA microcontroller with 1 KB of flash memory, 63 bytes of RAM, an internal oscillator, and an 8-pin SOIC package. It targets cost-sensitive embedded applications requiring minimal code space and a compact footprint. The verified product information identifies a 10 MHz device in distributor listings, while another listing describes a 20 MHz RS08KA family; use the manufacturer datasheet for the exact operating-frequency and electrical limits before final design release. The RS08 core is a compact CISC processor built around the S08 instruction set with additional high-performance LDA, STA, and CLR instructions. This MCU is intended for simple control, sensing, and actuator tasks where a larger 8-bit MCU would add unnecessary cost, memory, and board area. Its 63-byte RAM and 1 KB flash are sufficient for startup code, basic state machines, and tightly bounded control logic rather than general-purpose applications. The device operates from a low-voltage supply suitable for embedded and battery-oriented designs, with an internal oscillator eliminating a mandatory external clock source. The RS08KA family also includes timer and interrupt resources for periodic sensing and event handling. Power-management features and the small package help reduce both board footprint and system complexity in cost-driven products. Typical uses include simple keypad or button interfaces, low-speed motor and relay controllers, basic sensor nodes, household appliance controls, and auxiliary embedded functions. The compact SOIC-8 outline is useful when through-hole or leaded assembly is preferred, but its 1 KB program memory is a strict constraint for larger control algorithms. When designing around MC9RS08KA1CSC, verify the exact pin multiplexing, reset behavior, oscillator limits, and supply-voltage range in the NXP datasheet. Avoid assuming that all RS08 family members are software-compatible, because memory size and peripheral configurations can differ. A migration to a larger MCU may be required if the application grows beyond the 63-byte RAM and 1 KB flash budget. This product page combines verified distributor data, lifecycle information, package details, design constraints, and an honest assessment of alternative availability. It is intended to help engineers quickly determine whether this RS08KA device fits a minimal embedded-control design before requesting documentation and sourcing support.

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MC9RS08KA2CDB - 8-Bit RS08 MCU, 2KB Flash, 6-DFN | NXP
MC9RS08KA2CDB

MC9RS08KA2CDB - 8-Bit RS08 MCU, 2KB Flash, 6-DFN | NXP

The NXP Semiconductors MC9RS08KA2CDB is an 8-bit RS08KA-family microcontroller built around NXP's reduced RS08 core, offering 2KB of on-chip Flash program memory, 63 bytes of RAM, and a 10 MHz (20 MHz bus) CPU in a compact 6-pin DFN-EP (3x3 mm) package. According to distributor listings, the device integrates peripherals including a Low-Voltage Detect (LVD), Power-On Reset (POR), and a Watchdog Timer (WDT), with only 4 general-purpose I/O lines remaining after dedicated VDD/VSS and reset pins. Background: An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, program memory (Flash/ROM), data memory (RAM), and peripherals on one silicon die. The RS08 core is a streamlined variant of NXP's (formerly Freescale's) S08 architecture, designed for ultra-low-cost, ultra-low-pin-count applications where HCS08 performance is not required. The RS08 belongs to the 8-bit MCU product class within the broader microcontroller hierarchy (8-bit MCU -> microcontroller -> embedded computing -> semiconductor). It is intended for cost-sensitive, space-constrained designs that still need deterministic, low-power embedded control. Key specifications: the MC9RS08KA2CDB operates from a 1.8 V to 5.5 V supply (typical operating points 2.5 V/3.3 V/5 V), includes 2KB (2K x 8) of Flash, 63 x 8 RAM, and 4 GPIO. The internal analog comparator (ACMP) listed on some distributor variants is the key analog peripheral in this family, enabling simple threshold detection without an external op-amp. In design, the RS08 core uses a simplified S08 instruction set plus high-performance LDA, STA, and CLR instructions, allowing efficient C and assembly code generation on a tiny Flash budget. The 6-pin DFN-EP footprint with exposed pad gives a low thermal-resistance path and minimal PCB area, suited to coin-cell or battery-powered sensor nodes and appliance user-interface replacement. Typical applications: low-end consumer appliances, replacement of discrete logic + analog timer ICs, AC/DC wall-cube controller interfaces, simple LED drivers, battery chargers, and remote controls. The combination of small package, integrated LVD/POR, and ACMP lets one chip replace multiple discrete components. Design consideration: because only 4 I/O pins are available, designers must budget pin functions carefully — for example, one pin may be shared between ADC input, ACMP input, and external interrupt. Always connect the EP (exposed pad / pin 6 in some outlines) to the ground plane for thermal and electrical performance. This page synthesizes datasheet specifications, current distributor pricing, drop-in same-family alternatives, and PCB-level design notes compiled from manufacturer documentation and aftermarket listings — material not consolidated in any single OEM source.

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MC9RS08KA2CPC - 8-bit RS08 MCU, 2KB Flash, DIP-8 | NXP
MC9RS08KA2CPC

MC9RS08KA2CPC - 8-bit RS08 MCU, 2KB Flash, DIP-8 | NXP

The NXP MC9RS08KA2CPC is a 8-bit RS08 microcontroller with 2KB flash memory, 62 bytes of RAM, and an integrated analog comparator, housed in an 8-pin PDIP package. The device operates at up to 10 MHz bus frequency and is designed for ultra-low-end embedded control applications where minimal memory and low cost are priorities. An 8-bit microcontroller (MCU) is a small computer-on-a-chip containing a CPU core, flash program memory, RAM, and peripheral set on a single silicon die. Within the semiconductor taxonomy, the MC9RS08KA2CPC sits in the hierarchy: 8-bit MCU -> RS08 family microcontroller -> Freescale/NXP Kinetis-era low-end MCU -> embedded microcontroller -> integrated circuit. The simplified S08 instruction set adds LDA, STA, and CLR high-performance instructions to support compact code density. Key features include 2KB flash program memory, 62 bytes RAM, an integrated analog comparator for sensor interfacing, a low-voltage inhibit (LVI) module, power-on reset (POR), and an internal clock source. The 8-pin PDIP package supports through-hole PCB mounting, which simplifies prototyping, breadboarding, and low-volume production without surface-mount reflow equipment. The device also supports background debug mode (BDM) for in-circuit programming and debugging. The MC9RS08KA2CPC uses the RS08 central processor unit, which is a streamlined variant of the S08 core optimized for low pin-count applications. With the simplified instruction set, deterministic interrupt handling, and low quiescent current, the part targets cost-sensitive applications that require just enough compute to read sensors, drive outputs, and manage simple state machines. The internal oscillator and integrated analog comparator reduce external component count. Typical applications include consumer appliance controls, lighting controllers, simple sensor interfaces, battery chargers, and white goods. The combination of analog comparator, internal clock, and low pin count suits designs where the MCU is paired with a single analog signal and a few digital outputs. When designing with this part, note that the DIP-8 package requires through-hole PCB pads and clearance holes, which is unsuitable for high-density SMT boards. For new designs in this performance class, evaluate NXP's S08PT or S08P families, or Microchip's PIC16F or ATtiny families, which offer modern peripherals and active lifecycles. This page consolidates the verified NXP product information, datasheet links from distributor sources, and pin-compatible drop-in alternatives into a single engineer-ready reference not found in the standalone manufacturer datasheet.

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MC9RS08KA2CPC174 - 8-bit RS08 MCU 2KB Flash 20MHz | NXP
MC9RS08KA2CPC174

MC9RS08KA2CPC174 - 8-bit RS08 MCU 2KB Flash 20MHz | NXP

The NXP (Freescale Semiconductor) MC9RS08KA2CPC174 is an 8-bit RS08-core microcontroller with 2KB (2K x 8) FLASH memory, a 20MHz maximum CPU clock, and an 8-pin PDIP package. The RS08KA family is specifically crafted for the ultra-low-end market, delivering minimal memory, low power consumption, and cost-effective basic embedded control in an exceptionally small footprint. An 8-bit microcontroller (MCU) is a single-chip computer whose data bus is 8 bits wide, integrating a processor core, program memory (FLASH), RAM, I/O ports, and system protection into one package. Within the MCU hierarchy, the RS08 family sits below the S08 and HC08 families as a simplified, cost-optimized core retaining S08-derived instruction efficiency. Key features of the MC9RS08KA2 include the RS08 central processor unit with a simplified S08 instruction set augmented by high-performance LDA, STA, and CLR instructions, 2KB on-chip FLASH program memory, and 20MHz internal bus operation. System protection features and ultra-low-end cost positioning make it a direct drop for discrete logic and simple state-machine designs. Technically, the RS08 core streamlines the classic HC08/S08 architecture, reducing gate count and die size while preserving code compatibility concepts familiar to HC08 developers. The internal oscillator removes the need for external crystals in many designs, lowering bill-of-materials cost and board area. Typical applications include small appliance control, simple sensor interfacing, LED and indicator sequencing, low-cost battery chargers, and replacement of glue logic in industrial boards. The through-hole 8-PDIP package suits prototypes, legacy repair, and hand-soldered production. Design consideration: verify the availability status of this Rochester Electronics-distributed suffix, as the original Freescale device is a legacy part; plan second sourcing accordingly. This page synthesizes distributor pricing context, drop-in alternatives, and practical design notes not found in the manufacturer datasheet, providing engineering value beyond a standard product listing.

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MC9RS08KA4CPJ - 8-bit RS08 MCU, 4KB Flash, 20MHz, DIP-20
MC9RS08KA4CPJ

MC9RS08KA4CPJ - 8-bit RS08 MCU, 4KB Flash, 20MHz, DIP-20

The NXP MC9RS08KA4CPJ is an 8-bit RS08 microcontroller from the RS08KA family, delivering 4 KB of on-chip Flash, a maximum CPU clock of 20 MHz, and a 20-pin PDIP through-hole package. It is built on Freescale's (now NXP) reduced-instruction-set RS08 core, a streamlined successor to the legacy HC08 family, optimized for ultra-low-end cost-sensitive applications. The device supports operating voltages from 2.5V to 5.5V across the industrial temperature range up to 85 C. An 8-bit microcontroller (MCU) is a single-chip computer integrating a CPU, RAM, non-volatile program memory (Flash/ROM), and peripherals onto one silicon die. Within the broader hierarchy, the MC9RS08KA4CPJ sits at: 8-bit MCU -> RS08 architecture -> Freescale/NXP ColdFire-RS lineage -> embedded microcontroller -> semiconductor IC. The RS08 core is a subset of the well-known HC08 instruction set, allowing code compaction for cost-driven nodes such as appliance controls, toys, and simple sensor interfaces. Key features include 4 KB of Flash program memory, 63 bytes of RAM, an internal clock source, one 16-bit timer/PWM, an 8-bit analog-to-digital converter (ADC) with multiple channels, and an on-chip debug (BGND) interface for in-system programming. The CPU operates from an internal bus frequency that supports up to 20 MHz instruction execution, while integrated peripherals include a real-time interrupt (RTI), keyboard interrupt (KBI) module, and a low-power wait/stop mode to meet battery-life targets. Architecturally, the RS08 core delivers HC08-subset instructions encoded in a 16-bit opcode space, paired with a single 16-bit index register and a 16-bit stack pointer for efficient C interrupt handling. The internal clock can be driven from an external crystal or the on-chip oscillator, simplifying BOM count. Power management is handled by programmable RUN/WAIT/STOP modes, while the ADC, timers, and I/O are mapped through a unified memory-mapped peripheral space. Typical applications span low-end consumer electronics (e.g., battery chargers, LED controllers, remote controls, and small appliances), white goods and HVAC sub-modules, and simple sensor-conditioned interfaces. It also fits human-interface nodes that replace mechanical switches with capacitive or resistive sensing, and as a supervisory MCU bridging a low-power wakeup role for larger SoCs. When designing with the MC9RS08KA4CPJ, ensure the application firmware follows the RS08KAP background-debug-mode vector map and reserves the highest-address Flash sector for vector redirection. The 20-pin PDIP package is footprint-compatible with the broader RS08KA family (1 KB / 2 KB / 4 KB Flash density options), making it easy to migrate code between density tiers without PCB rework. This page synthesizes distributor pricing, package-correct drop-in alternatives inside the RS08KA family, and practical design notes not consolidated in any single vendor portal. Engineers evaluating cost-down replacements will find the same-brand density variants and the recommended alternatives list especially useful.

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MC9RS08KA4CWG - 8-Bit 20MHz 4KB Flash MCU | NXP
MC9RS08KA4CWG

MC9RS08KA4CWG - 8-Bit 20MHz 4KB Flash MCU | NXP

The NXP Semiconductors MC9RS08KA4CWG is an 8-bit RS08KA microcontroller rated for operation up to 20 MHz, with 4 KB of flash program memory and 128 bytes of RAM, housed in a 16-pin SOIC package. It is intended for cost-sensitive, low-end embedded systems that require essential control functions, low-power modes, and a compact architecture. A microcontroller is a semiconductor device that integrates a processor core, program memory, data memory, peripherals, and input/output functions into one component. In the system hierarchy, this MCU belongs to the embedded-controller and integrated-circuit classes rather than to a general-purpose computer. Its small RS08 core is designed for compact control logic, allowing a product to replace separate logic devices while keeping the design economical. Key verified features include an 8-bit RS08 central processing unit, 20 MHz maximum CPU frequency, 4 KB flash organized as 4K x 8, and 128 bytes of RAM. The device is associated with the RS08KA general-purpose family for ultra-low-end applications. Its flash memory provides nonvolatile program storage, while RAM supports working variables and stack operations. The 16-SOIC package also offers a familiar surface-mount footprint for conventional PCB assembly. The MC9RS08KA4CWG is suitable for simple embedded controllers where the application does not require a large memory footprint or high computational throughput. It can be used in cost-sensitive control systems, small sensor interfaces, basic actuator controllers, household equipment, and low-power embedded products. The 20 MHz CPU rating provides a clear performance ceiling for designs using the RS08KA instruction set and peripheral resources. The device is listed as an NXP product with an end-of-life overview, so lifecycle planning should confirm availability, last-time-buy information, and any approved successor before new production designs are released. Because the target is not a power semiconductor, safe-operating-area data is not applicable. For PCB design, use the manufacturer pinout and package drawing for every connection, especially power, reset, clock, and I/O pins. Confirm the supported supply voltage, oscillator configuration, programming method, and peripheral multiplexing in the official datasheet. Keep traces short, provide appropriate decoupling near the supply pins, and validate the final firmware and timing on representative hardware. This product page combines the verified distributor identity, NXP lifecycle information, package and memory specifications, and engineering-oriented selection notes. It is intended to support sourcing and design review while clearly separating verified facts from details that require confirmation from the manufacturer datasheet.

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MC9RS08KA4CWJ - RS08 8-bit MCU, 4KB Flash, 20MHz | NXP
MC9RS08KA4CWJ

MC9RS08KA4CWJ - RS08 8-bit MCU, 4KB Flash, 20MHz | NXP

NXP (formerly Freescale) MC9RS08KA4CWJ is an 8-bit RS08KA-series microcontroller delivering 4 KB of flash, 20 MHz CPU performance, and 4 GPIO pins in a 20-pin SOIC package for space-constrained, low-power embedded applications. An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, RAM, non-volatile program memory, and peripheral I/O on one silicon die. 8-bit MCUs occupy the ultra-low-end of the embedded hierarchy: MCU -> microcontroller -> embedded processor -> semiconductor. They are favored for cost-sensitive and energy-efficient applications such as simple motor control, user-interface button reading, sensor signal conditioning, and white-goods appliance logic, where 32-bit performance is overkill. The RS08 core is a streamlined HC08 subset designed by NXP specifically for small-memory, low-pin-count devices. Key features of the MC9RS08KA4CWJ include a 20 MHz maximum CPU clock, 4 KB of on-chip flash program memory, an integrated clock source to reduce external BOM, and an operating voltage range up to 5.5 V across the industrial -40C to +85C temperature range. The device targets the ultra-low-end market with RS08 architecture optimized for small-memory designs, providing a cost-effective path for simple control tasks. From an architectural standpoint, the RS08KA family uses a reduced instruction set compared to the legacy HC08, enabling a smaller die size and lower quiescent current. The internal oscillator eliminates an external crystal in many designs, further reducing both BOM cost and PCB area. The 20-pin SOIC package is footprint-compatible with the rest of the RS08KA family, which simplifies PCB reuse across KA1, KA2, KA4, and KA8 memory options. Typical applications include battery-powered sensors, simple user-interface controllers, low-cost appliance controls, LED lighting drivers, and consumer electronics where 4 GPIO pins and 4 KB of code space are sufficient. The wide operating voltage range makes it compatible with both 3.3 V and 5 V rails commonly found in industrial and white-goods designs. When designing with the MC9RS08KA4CWJ, plan for code size to remain within 4 KB of flash and reserve the four GPIO pins carefully. NXP documentation recommends leaving one pin for BKGD debugging if in-system programming is required, which reduces the practical GPIO budget to three pins for the application. This page synthesizes distributor pricing, drop-in KA-family alternatives, and practical design notes not found in the manufacturer datasheet alone.

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MC9RS08KA4CWJR - RS08 8-bit MCU, 4KB Flash, 20MHz | NXP (Tape & Reel)
MC9RS08KA4CWJR

MC9RS08KA4CWJR - RS08 8-bit MCU, 4KB Flash, 20MHz | NXP (Tape & Reel)

NXP (formerly Freescale) MC9RS08KA4CWJR is an 8-bit RS08KA-series microcontroller delivering 4 KB of flash, 20 MHz CPU performance, and 4 GPIO pins in a 20-pin SOIC package for space-constrained, low-power embedded applications. An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, RAM, non-volatile program memory, and peripheral I/O on one silicon die. 8-bit MCUs occupy the ultra-low-end of the embedded hierarchy: MCU -> microcontroller -> embedded processor -> semiconductor. They are favored for cost-sensitive and energy-efficient applications such as simple motor control, user-interface button reading, sensor signal conditioning, and white-goods appliance logic, where 32-bit performance is overkill. The RS08 core is a streamlined HC08 subset designed by NXP specifically for small-memory, low-pin-count devices. Key features of the MC9RS08KA4CWJR include a 20 MHz maximum CPU clock, 4 KB of on-chip flash program memory, an integrated clock source to reduce external BOM, and an operating voltage range up to 5.5 V across the industrial -40C to +85C temperature range. The device targets the ultra-low-end market with RS08 architecture optimized for small-memory designs, providing a cost-effective path for simple control tasks. From an architectural standpoint, the RS08KA family uses a reduced instruction set compared to the legacy HC08, enabling a smaller die size and lower quiescent current. The internal oscillator eliminates an external crystal in many designs, further reducing both BOM cost and PCB area. The 20-pin SOIC package is footprint-compatible with the rest of the RS08KA family, which simplifies PCB reuse across KA1, KA2, KA4, and KA8 memory options. Typical applications include battery-powered sensors, simple user-interface controllers, low-cost appliance controls, LED lighting drivers, and consumer electronics where 4 GPIO pins and 4 KB of code space are sufficient. The wide operating voltage range makes it compatible with both 3.3 V and 5 V rails commonly found in industrial and white-goods designs. When designing with the MC9RS08KA4CWJR, plan for code size to remain within 4 KB of flash and reserve the four GPIO pins carefully. NXP documentation recommends leaving one pin for BKGD debugging if in-system programming is required, which reduces the practical GPIO budget to three pins for the application. This page synthesizes distributor pricing, drop-in KA-family alternatives, and practical design notes not found in the manufacturer datasheet alone.

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MC9RS08KA8CPG - 8-Bit 20MHz RS08KA MCU | NXP
MC9RS08KA8CPG

MC9RS08KA8CPG - 8-Bit 20MHz RS08KA MCU | NXP

The NXP Semiconductors MC9RS08KA8CPG is an 8-bit RS08KA microcontroller operating up to 20 MHz, with 8 KB of Flash memory and a 4-channel ADC, in a 16-pin through-hole DIP package. The device targets cost-sensitive automotive and industrial controls and is listed by NXP with an End of Life overview. A microcontroller is a programmable system-on-chip that integrates a CPU core, memory, peripherals, and input/output functions on one semiconductor. In the product hierarchy, the RS08KA MCU is an 8-bit microcontroller, part of the RS08 family, and a general-purpose embedded-control component. This class of device is used to read sensors, control outputs, sequence system operations, and execute firmware without a separate processor. The verified device data identifies an RS08 CPU, 8-bit data-bus width, 20 MHz maximum clock frequency, 8 KB Flash, and a 4-channel ADC. The RS08KA series is described as suitable for cost-sensitive automotive and industrial applications. A 2.7 V minimum and 5.5 V maximum supply range appears in the supplied comparison data, while the general family description also states 5.5 V operation across the temperature range. The 16-pin DIP package is appropriate for prototypes, educational platforms, repair work, and through-hole industrial assemblies where a leaded package simplifies manual insertion and socket replacement. Unlike a surface-mount MCU, it requires adequate board spacing and through-hole routing, but it avoids a fine-pitch rework process. The package and pin compatibility of any substitute must be verified before it is treated as a drop-in replacement. Typical uses include low-cost automotive control modules, industrial switch and sensor interfaces, simple keypad controllers, compact instrumentation, and general embedded products. The ADC enables analog measurements, while the 8-bit CPU and 8 KB Flash provide a constrained platform for firmware that does not require high memory density or high processing throughput. The principal design consideration is lifecycle planning: the NXP product page indicates End of Life, so new production designs should confirm availability, migration options, and any approved successor before committing. For existing boards, preserve the original pinout, supply voltage, clock requirements, peripheral assignments, and programming method during replacement qualification. This page combines verified manufacturer and distributor information with package, sourcing, lifecycle, and design considerations. It does not infer unverified electrical values or claim a replacement unless a same-package, pin-compatible candidate can be supported by the supplied evidence.

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MC9RS08KA8CPJ - 8-Bit RS08 MCU, 8KB Flash, 20-DIP | NXP
MC9RS08KA8CPJ

MC9RS08KA8CPJ - 8-Bit RS08 MCU, 8KB Flash, 20-DIP | NXP

The NXP MC9RS08KA8CPJ is an RS08KA-series 8-bit microcontroller built on NXP's RS08 core, delivering 20 MHz CPU performance with 8 KB of on-chip flash memory in a 20-pin PDIP (through-hole DIP-20) package. Designed as a general-purpose, ultra-low-end MCU, it offers an instruction-set subset of the HC08 family with a compact 8-bit data bus and an integrated peripheral set targeted at cost-sensitive consumer and industrial appliances. The RS08 family sits within the 8-bit microcontroller taxonomy in the broader microcontroller > processor > semiconductor hierarchy. It shares the HC08 instruction-set architecture lineage (HC08 > Freescale/NXP 8-bit > MCU > semiconductor device) but uses a streamlined register model and reduced peripheral set to hit aggressive price points for high-volume appliances, toys, and small-form-factor controllers. Key features include an 8-bit RS08 CPU at up to 20 MHz, 8 KB (8K x 8) flash program memory, multiple operating-voltage modes (2.5 V / 3.3 V / 5 V), 5.5 V absolute-maximum supply tolerance across the -40 °C to +85 °C temperature range, an integrated clock source, and an efficient low-power stop mode for battery-friendly designs. The PDIP-20 package is friendly to hobbyist, prototype, and low-volume through-hole assemblies. Typical applications include ultra-low-cost consumer appliances, simple sensor and motor controllers, white-goods user-interface boards, battery-powered handheld devices, and educational microcontroller platforms where HC08 toolchain familiarity and through-hole package simplicity shorten development cycles. When designing with this MCU, verify that the chosen toolchain (CodeWarrior IDE classic, CW for MCU v10.x, or third-party GCC/P&E ICD support) matches the part's RS08 debug interface, and budget flash endurance (typically 10 k cycles for this family) for any application that performs in-field firmware updates.

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MC9RS08KA8CTG - 8KB Flash 20MHz RS08 8-bit MCU | NXP
MC9RS08KA8CTG

MC9RS08KA8CTG - 8KB Flash 20MHz RS08 8-bit MCU | NXP

The NXP Semiconductors (formerly Freescale) MC9RS08KA8CTG is an 8-bit RS08 microcontroller delivering up to 20 MHz CPU performance with 8 KB of on-chip flash memory and 254 B of RAM, housed in a 16-pin TSSOP package. According to the manufacturer datasheet, the device operates from 2.5 V to 5.5 V across the industrial temperature range of -40 C to +85 C, and integrates peripherals including an internal oscillator, ADC, timers, and 14 general-purpose I/O pins. What is an 8-bit microcontroller? An 8-bit microcontroller is a single-chip computer that uses an 8-bit data path, combining a CPU, program memory (typically flash), data memory (RAM), and integrated peripherals such as timers, ADC, communication interfaces, and GPIO. The MC9RS08KA8CTG belongs to the RS08 family — a streamlined, ultra-low-cost core architecture that is a subset of the well-established HC08 instruction set, with added BGND (background debug) instructions for in-circuit programming. Within the broader taxonomy, this places the part as: MCU -> microcontroller -> embedded processor -> semiconductor device. Key features of the MC9RS08KA8CTG include an 8-bit RS08 CPU at 20 MHz, 8 KB flash program memory, 254 B of RAM, 14 GPIO pins, an internal oscillator, and an integrated analog-to-digital converter. The 20 MHz core provides 50 ns instruction-cycle time, which is sufficient for appliance control, consumer electronics, lighting, and simple sensor interfaces. The 16-pin TSSOP (4.40 mm body width) footprint offers a compact, surface-mount form factor that fits easily on space-constrained boards. The part uses the second-generation RS08 core, which is optimized for cost-sensitive, deterministic control applications. Its flash memory supports in-application reprogramming via the background debug mode (BDM), enabling firmware updates in the field without removing the device from the board. The wide 2.7 V to 5.5 V operating range makes it compatible with both 3.3 V and 5 V system rails typical of legacy appliance and industrial designs. Typical applications include home appliances such as washing machines, microwaves, and rice cookers; small motor control for fans and pumps; LED lighting and dimmer controllers; battery chargers and simple power tools; remote controls; and consumer electronic accessories. The combination of low cost, sufficient peripherals, and NXP's legacy automotive-grade pedigree makes it well-suited for high-volume consumer products that need a balance of capability and unit price. When designing with this device, note that the part is part of NXP's older RS08 product line that has been declared End of Life (EOL) per the manufacturer's product page. Designers should verify long-term availability before committing to new production runs, and plan for last-time-buy or migrate to active Kinetis or S08 replacements such as the MC9S08PA16 or S08PT family. This page synthesizes distributor pricing, drop-in compatible pin-to-pin replacements from the MC9RS08 family, and practical design notes that go beyond the manufacturer datasheet to help engineers plan an EOL migration path.

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MC9RS08KA8CWG - 8-bit RS08 MCU, 8KB Flash, 20MHz | NXP
MC9RS08KA8CWG

MC9RS08KA8CWG - 8-bit RS08 MCU, 8KB Flash, 20MHz | NXP

The NXP (formerly Freescale) MC9RS08KA8CWG is an 8-bit RS08KA-series microcontroller built around the RS08 core, featuring 8KB of on-chip Flash, 20 MHz maximum CPU frequency, and packaged in a 16-pin SOIC (SO16). It is designed as a cost-optimized, ultra-low-end general-purpose MCU for cost-sensitive embedded applications. According to NXP product information, this part is currently flagged for end-of-life discontinuance, with Rochester Electronics listed as a continuity source on DigiKey Marketplace. RS08 microcontrollers belong to the broader 8-bit MCU family and are derived from the legacy HC08 architecture via the simplified RS (Reduced State) core. The RS08KA family sits within the Freescale/NXP 8-bit portfolio, between simple 4/8-pin devices and the more feature-rich S08 family. Within the system hierarchy, an 8-bit MCU such as this sits at the sensing, control, and glue-logic layer of an embedded design - below 32-bit application processors and above purely analog components. The RS08 core drops some HC08 instructions and addressing modes in exchange for smaller die area and lower cost, while retaining a usable interrupt controller and peripheral set. Key features of the MC9RS08KA8CWG include 8KB Flash program memory, 20 MHz bus/Core clock (from an internal source with optional trimming), on-chip voltage regulator for wide 2.5 V to 5.5 V supply operation, multiple low-power stop modes, an integrated Analog-to-Digital Converter (ADC), timers, and a small set of GPIO pins suited to SOIC-16 board-level designs. The part ships in industrial temperature range (-40 °C to +85 °C or +105 °C per datasheet specifics) in a thru-hole-friendly SOIC-16 wide-body package. From an architecture standpoint, the device uses a Harvard-style 8-bit datapath with a 16-bit index register, 32 KB address space, and a vectored interrupt structure. The internal 1 kB RAM and 128-byte EEPROM/Flash-info area support small data tables and stack-intensive C programs via the Freescale/NXP CodeWarrior toolchain. An integrated brown-out detector and watchdog improve field robustness. Typical applications include household appliances, white goods user interfaces, low-end remote controls, small sensor nodes, LED driving boards, toys, and simple motor/relay controllers where cost is the dominant design constraint and 8-bit headroom is sufficient. When migrating designs, verify VDD tolerance, pinout, and ADC channel mapping against the latest MC9RS08KA8 datasheet (Rev. 4) because NXP has documented PCN-style changes that may differ from earlier revisions. RoHS status should be confirmed at order entry given the part's end-of-life notice. This page synthesizes distributor pricing, drop-in same-package alternatives within the RS08KA family, lifecycle notes, and practical design considerations that are not aggregated in any single manufacturer document.

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MC9RS08KA8CWJ - 8-bit RS08 MCU, 8KB Flash, 20MHz | NXP
MC9RS08KA8CWJ

MC9RS08KA8CWJ - 8-bit RS08 MCU, 8KB Flash, 20MHz | NXP

The NXP Semiconductors (formerly Freescale) MC9RS08KA8CWJ is an 8-bit RS08-family microcontroller with 8KB of on-chip Flash memory, a 20MHz CPU core, and a 20-SOIC Wide-body package. It targets ultra-low-end cost-sensitive applications using a streamlined subset of the HC08 instruction set augmented by a BGND background debug instruction, and offers 18 general-purpose I/O ports for flexible peripheral connectivity in compact designs. An 8-bit microcontroller (MCU) is an integrated circuit that combines a CPU, program memory (ROM/Flash), data memory (RAM), and various peripherals on a single die. The 8-bit RS08 core is a reduced-instruction-set derivative of the Freescale HC08 architecture, intentionally simplified to deliver HC08-compatible software behavior at a lower cost and smaller silicon area. MCUs like the MC9RS08KA8CWJ occupy the lowest tier of the microcontroller taxonomy - below 16-bit (MSP430, RL78) and 32-bit (Cortex-M0) devices - and are commonly used where cost and code density outweigh raw throughput. The RS08 family sits under NXP's broader 8-bit MCU portfolio and is positioned below S08, HCS08, and Coldfire V1 parts. Key features include 8KB of Flash program memory, up to 20MHz CPU clock, internal clock source option for BOM reduction, an integrated keyboard interface (KBI) for human-input applications, and a wide operating voltage range of 2.5V to 5.5V. The device supports 20-pin SOIC-Wide packaging, industrial temperature range of -40C to +85C, and is rated for tube-packaged shipping. Architecturally, the MC9RS08KA8CWJ uses the RS08 CPU core - a stripped-down HC08 subset - paired with Flash memory, RAM, on-chip debug, and a peripheral set including timers, KBI, ADC, and an internal clock source. The CPU executes a streamlined instruction set with most HC08 addressing modes retained, simplifying code porting from legacy HC08 designs while reducing die area. The 20MHz CPU drives up to 100ns instruction cycle times. Typical applications include cost-sensitive consumer appliances, low-end remote controls, simple sensor interfaces, KBI-equipped human-interface devices, and industrial controllers requiring minimal MCU capability. The integrated keyboard interface makes it well suited for matrix-scanned keypads. When designing with this device, prioritize firmware reuse from existing HC08 code where possible. Ensure the KBI pin assignments match the keypad matrix and consider external interrupt sources for wake-from-stop events. Use the internal clock source if BOM cost reduction outweighs timing accuracy requirements. This page synthesizes distributor pricing, drop-in KA-series alternatives, and practical design notes not found in the standalone manufacturer datasheet.

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MC9RS08KB12CSG574 - 8-bit RS08 MCU, 12KB Flash, 20MHz | NXP
MC9RS08KB12CSG574

MC9RS08KB12CSG574 - 8-bit RS08 MCU, 12KB Flash, 20MHz | NXP

The NXP MC9RS08KB12CSG574 is an 8-bit RS08 microcontroller from the RS08KB family, featuring 12KB of Flash program memory and operating at up to 20MHz core frequency, housed in a 16-pin SOIC package. It belongs to NXP's (formerly Freescale's) ultra-low-cost RS08KB 8-bit MCU lineup, designed for cost-sensitive embedded applications requiring reliable Flash-based program storage and a compact footprint. A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory (typically Flash), data RAM, and peripherals such as timers, ADCs, communication interfaces, and GPIO onto one silicon die. The RS08 family is a reduced-instruction-set 8-bit core targeting ultra-low-cost applications, sitting beneath the HCS08 in NXP's 8-bit hierarchy but using a streamlined instruction set optimized for code density and small die area. The RS08KB series specifically integrates a peripheral set tuned for motor control, appliance, lighting, and consumer product designs. Key features of the MC9RS08KB12CSG574 include 12KB (12K x 8) of on-chip Flash memory, an 8-bit RS08 CPU core with interrupt capability, on-chip peripherals suitable for embedded control, and wide operating voltage support typical of the family. The device is intended for designers who need a Flash-based 8-bit MCU with sufficient code space for small to medium embedded applications, while keeping the bill-of-materials cost low. The 16-pin SOIC (Small Outline Integrated Circuit) package is a through-hole-replacement-style surface-mount package with 1.27mm pitch, offering a compact 3.9mm body width suitable for hand-solderable prototyping as well as high-volume reflow assembly. SOIC-16 is a broadly available, low-cost package stocked across virtually every distributor, simplifying both initial sampling and production ramp. Typical applications for the MC9RS08KB12CSG574 include small consumer appliances, white goods sub-modules, low-end remote controls, simple sensor signal conditioning, lighting ballast controls, battery chargers, and educational/development platforms that benefit from a free toolchain and minimal external component count. The Flash-based program memory allows in-system reprogramming via the standard background debug mode (BDM), enabling fast firmware iteration during development. When designing with this part, evaluate whether the peripheral set (timers, ADC channels, communication interfaces) meets the application's I/O and timing requirements before locking in the design. Designers should also confirm code-size headroom - 12KB accommodates small algorithms but may constrain complex state machines - and verify the available development tools (CodeWarrior for RS08, third-party IDEs) match their team workflow. This page synthesizes distributor availability across DigiKey, Mouser, Rochester Electronics, LCSC, and Octopart, alongside NXP product documentation, parametric comparison data, and drop-in alternative analysis not consolidated in any single manufacturer datasheet.

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MC9RS08KB12CWJ - 8-bit RS08 MCU, 12KB Flash, 20MHz | NXP SOIC-20
MC9RS08KB12CWJ

MC9RS08KB12CWJ - 8-bit RS08 MCU, 12KB Flash, 20MHz | NXP SOIC-20

The NXP MC9RS08KB12CWJ is an 8-bit RS08 microcontroller from the RS08KB family, featuring a 12KB flash memory, a 20MHz CPU clock, and operating voltage support at 2.5V/3.3V/5V in a 20-pin SOIC (SOIC 7.50 mm width) package. Originally released by Freescale Semiconductor (now part of NXP), this MCU is built around the RS08 core, which uses a subset of the HC08 instruction set with the added BGND (background debug) instruction for in-circuit debug and programming. RS08 microcontrollers represent an entry-level family within NXP's 8-bit portfolio, sitting in the hierarchy of microcontroller -> 8-bit MCU -> RS08 family -> small-flash KB series. They target cost-sensitive embedded designs where simple, deterministic instruction set execution, low pin count, and an integrated peripheral set are more important than 16- or 32-bit computational headroom. The RS08 core is engineered as an efficient companion to the legacy HC08, allowing legacy code reuse while reducing die size and cost. Key features include 12KB (12K x 8) of on-chip flash program memory, 126 bytes of RAM, an integrated analog comparator, an 8-bit timer with PWM capability, and support for multiple communication options through firmware. The single global interrupt vector, combined with fast interrupt entry/exit, simplifies firmware design for control loops and peripheral polling. The device operates across an extended voltage range and industrial temperature, making it suitable for automotive body controllers, appliance control boards, and industrial sensor interface modules. The architecture uses a streamlined Harvard-based path with a von-Neumann-style unified memory map. Its 20MHz internal bus, derived from an on-chip oscillator or external clock, allows the same instruction throughput per MHz as the legacy HC08, easing migration for engineers porting legacy HC08 code. Power management modes (WAIT and STOP) reduce average current in battery-powered or quiescent-duty applications such as remote controls or standby sensor boards. Typical applications include consumer appliance control panels, automotive interior lighting and HVAC actuators, small-format industrial sensors, and low-cost hobby/educational embedded platforms. The 20-SOIC package supports both hand-solderable prototyping and standard SMT production lines. When designing with this MCU, confirm available timer and ADC channels against the application requirement; the small pin count means peripheral multiplexing may be required for complex interfaces. Programming is supported via NXP's CodeWarrior IDE and the standard RS08 background-debug interface (BDM), with programming headers compatible with the wider Freescale/NXP 5V MCU family. This page synthesizes distributor pricing, verified lifecycle status, drop-in alternatives, and practical design notes that complement the manufacturer datasheet.

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MC9RS08KB4CSG - 8-bit RS08 MCU, 4KB Flash, 20MHz | NXP
MC9RS08KB4CSG

MC9RS08KB4CSG - 8-bit RS08 MCU, 4KB Flash, 20MHz | NXP

The NXP (formerly Freescale) MC9RS08KB4CSG is an 8-bit RS08 microcontroller (MCU) featuring 4KB of on-chip Flash memory, a 20MHz CPU clock, and a 16-pin SOIC package. It belongs to the RS08KB family of low-cost, low-power microcontrollers designed for cost-sensitive embedded applications, and operates across a 2.7V to 5.5V supply range. An 8-bit microcontroller is a single-chip computer that integrates a CPU, memory (Flash/RAM), and peripherals onto one silicon die. The RS08 core is a reduced-instruction-set variant of the HC08 core, offering a subset of the HC08 instruction set plus a BGND (background debug) instruction. The RS08KB sits within the broader taxonomy of 8-bit MCU -> microcontroller -> embedded processor -> semiconductor device. By keeping competitive low-cost, low-power 8-bit controllers, NXP targets white goods, simple sensors, and battery-operated devices where 32-bit Cortex-M MCUs would be overkill. Key features of the MC9RS08KB4CSG include 4KB (4K x 8) of program Flash, 126 bytes of RAM, an integrated analog-to-digital converter (ADC), timers, a serial communications interface (SCI), and an inter-integrated circuit (I2C) module. The device also includes an internal clock source, multiple I/O pins, and a low-power stop mode for energy-constrained designs. Its 5V tolerance and rugged I/O make it well suited for industrial and appliance environments. The RS08KB family eases migration by offering multiple package and flash size options, along with pin compatibility across other 5-volt NXP families and support for the CodeWarrior development toolchain. Compared with more powerful ColdFire or Kinetis ARM Cortex-M parts, the RS08 is intentionally lean: one global interrupt vector, fewer addressing modes, and reduced register file, all of which reduce die cost and code size for simple control loops. Typical applications for the MC9RS08KB4CSG include home appliances (washing machine user interfaces, microwave control panels), battery chargers, LED drivers, low-end toys, simple sensor signal conditioning, and small consumer electronics that require reliable 5V-tolerant digital control. The 20MHz CPU provides ample headroom for basic motor control loops, PWM generation, and UART-based communication with companion chips. When designing with this MCU, ensure the supply rail stays within 2.7V to 5.5V and respect absolute-maximum ratings on I/O pins. For applications that outgrow 4KB Flash, the family offers pin-compatible higher-density variants (KB8, KB12) and migration paths to the S08 and Kinetis families with the same peripheral IP and toolchain. This page combines verified distributor pricing, same-brand drop-in alternatives, and practical design notes not aggregated on the manufacturer product page.

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MC9RS08KB4CWJ - 8-bit RS08 MCU, 4KB Flash, 20MHz | NXP
MC9RS08KB4CWJ

MC9RS08KB4CWJ - 8-bit RS08 MCU, 4KB Flash, 20MHz | NXP

The NXP MC9RS08KB4CWJ is an 8-bit microcontroller built on the RS08 core, delivering 20 MHz CPU performance with 4 KB of on-chip Flash and 126 B of SRAM in a 20-pin SOIC (SOIC-20 wide-body) package. It targets cost-sensitive, low-power embedded control applications where simple deterministic behavior and a small PCB footprint are priorities. The part is part of the RS08KB family that extends the legacy HC08 instruction set with the BGND (background debug) instruction, easing migration for engineers familiar with the Freescale HC08 architecture. A microcontroller (MCU) is a single-chip computer that integrates a CPU, program memory (ROM/Flash), working memory (RAM), and peripherals such as timers, communication ports, and analog blocks. The MC9RS08KB4CWJ belongs to the taxonomy: microcontroller -> 8-bit MCU -> RS08 core MCU -> RS08KB family -> low-cost general-purpose embedded controller. The RS08KB line sits at the entry level of NXP's 8-bit portfolio and is designed for fans, white goods, motor control, simple sensor readouts, and human-machine interface (HMI) edge nodes where 32-bit MCUs would be over-spec and unnecessarily expensive. Key features include 18 general-purpose I/O pins, a 16-bit timer/PWM module, an 8-bit analog-to-digital converter (ADC) on most family members, on-chip debug via background debug mode (BDM), and integrated peripherals including a real-time counter (RTC), watchdog timer (WDT), low-voltage detect (LVD), and power-on reset (POR). The device supports I2C and SPI connectivity for sensor and external peripheral interfacing, reducing external component count. The wide 2.5 V to 5.5 V operating range allows direct connection to 5 V rails or 2x AA / 3x AA battery stacks. Architecturally, the RS08 core implements a subset of the HC08 instruction set, retaining byte-efficient BCD and bit-manipulation operations favored in legacy 8-bit code while shrinking die area. The 20 MHz internal bus and 4 KB Flash enable small real-time control loops, while the 126 B SRAM is sufficient for modest state machines and protocol stacks (e.g., simple proprietary RF, sensor fusion at low sample rates). Typical applications include small appliance control (rice cookers, fans, blenders), LED drivers, battery chargers, low-cost remote controls, sensor interfaces, and 5 V industrial sensor conditioning. The on-chip peripherals (ADC, PWM, timers, I2C/SPI) enable single-chip solutions in space-constrained designs, eliminating external driver or decoder ICs. When designing with the MC9RS08KB4CWJ, place a 100 nF decoupling capacitor as close as possible to the VDD pin and a 10 uF bulk capacitor on the board supply. Keep the BDM debug header accessible during prototype bring-up - the RS08KB requires the BDM interface for programming and in-circuit debugging. This page synthesizes distributor pricing, drop-in alternatives within the RS08 family, and practical design notes not found in the manufacturer datasheet alone.

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MC9RS08KB8CTG - 8-bit RS08 MCU, 8KB Flash, 20MHz | NXP
MC9RS08KB8CTG

MC9RS08KB8CTG - 8-bit RS08 MCU, 8KB Flash, 20MHz | NXP

The NXP MC9RS08KB8CTG is an 8-bit RS08 microcontroller delivering 20 MHz CPU performance with 8 KB on-chip Flash and 16-pin TSSOP packaging. It targets cost-sensitive, low-pin-count embedded applications requiring a 5 V tolerant HC08-superset core. An 8-bit microcontroller (MCU) is a single-chip computer built around an 8-bit data path, integrating a CPU, non-volatile program memory (Flash), volatile data memory (RAM), and peripherals such as timers, ADCs, and communication interfaces. The MCU sits below microprocessors and above discrete logic in the embedded hierarchy, and the RS08KB family is a flash-based, low-pin variant within the broader Freescale/NXP 8-bit and 32-bit automotive and industrial MCU portfolio. Key features of the MC9RS08KB8CTG include an 8 KB Flash program memory, a 20 MHz RS08 core with BGND debug instruction, a single global interrupt vector, and operation across 2.7 V to 5.5 V supply range. The device integrates an analog-to-digital converter, timer modules, and serial communication blocks, supporting reduced system cost through peripheral integration. The TSSOP-16 footprint offers compact board placement suitable for space-constrained designs. The RS08 core is a reduced-instruction-set variant of the HC08 family, retaining code efficiency and toolchain familiarity while trimming die size. On-chip hardware breakpoints and the BGND instruction simplify in-circuit debug via standard RS08 background debug tools, lowering the engineering effort required for firmware bring-up versus pure software emulation. Typical applications include small home appliances, sensor interface modules, LED lighting controllers, low-end motor control signal boards, and industrial sensor hubs. The wide operating voltage and industrial temperature range suit automotive body and chassis subsystems as well as factory-automation peripherals. When designing with this MCU, ensure decoupling capacitors are placed close to the VDD pins and that unused pins follow the datasheet recommendations to avoid spurious interrupts. Migrating from larger RS08KB family members preserves pin compatibility when staying within the same package.

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MC9RS08KB8CWJ - 8-Bit 20MHz RS08 MCU | NXP Semiconductors
MC9RS08KB8CWJ

MC9RS08KB8CWJ - 8-Bit 20MHz RS08 MCU | NXP Semiconductors

The NXP Semiconductors MC9RS08KB8CWJ is an 8-bit RS08 microcontroller with a 20 MHz CPU, 8 KB of Flash memory, and a 20-pin SOIC package. It is designed for compact embedded-control designs that require efficient interrupt handling and a broad operating-voltage range. The supplied manufacturer and distributor data identify the device as an RS08KB-family MCU with 8K x 8 Flash memory. What is an RS08 microcontroller? An RS08 MCU is an 8-bit embedded microcontroller, a member of the broader microcontroller and semiconductor hierarchy. It combines a compact central processing unit with on-chip program memory, interrupt capability, and integrated peripherals. The RS08KB family is positioned for small control systems where low component count, deterministic control, and simple firmware execution are useful. Its 20 MHz CPU provides a higher operating speed than basic 8-bit devices while retaining the simplicity of the RS08 instruction set. Key verified features include an 8-bit CPU, operation up to 20 MHz, 8 KB Flash memory, 8K x 8 organization, a 20-pin SOIC package, and a stated 5.5 V maximum supply condition across the temperature range. The family description also identifies support for interrupt capability and compatibility with other 5 V families. These attributes make the MC9RS08KB8CWJ suitable for compact appliance controls, sensor-conditioning systems, simple motor-control functions, and low-cost embedded products. The MCU’s 8 KB Flash capacity is appropriate for moderate control firmware, while the 8-bit architecture simplifies resource budgeting and peripheral integration. The supplied sources identify the lifecycle as ACTIVE on one technical datasheet page, although the NXP product page contains an End of Life overview. Because lifecycle and procurement conditions can change, purchasing decisions should confirm current NXP or authorized-distributor status for the exact orderable MPN. When designing a board around the MC9RS08KB8CWJ, use the 20-pin SOIC footprint and verify every signal against the applicable datasheet pinout before layout. The device is intended for 5 V-oriented embedded systems; input levels, peripherals, clocking, programming, and decoupling must be designed around the verified electrical limits rather than inferred from generic 8-bit MCU conventions. This page consolidates the verified RS08KB specifications, sourcing links, lifecycle evidence, and engineering-oriented design cautions. It distinguishes known facts such as CPU speed, Flash size, package, and voltage information from unavailable details rather than estimating electrical values or package pin assignments.

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MC9RS08KB8CWJ574 - RS08 8-bit MCU, 8KB Flash, 20MHz | NXP
MC9RS08KB8CWJ574

MC9RS08KB8CWJ574 - RS08 8-bit MCU, 8KB Flash, 20MHz | NXP

The NXP (formerly Freescale) MC9RS08KB8CWJ574 is an 8-bit RS08KB-family microcontroller with 8KB of Flash program memory, housed in a 20-pin SOIC wide-body package, designed for cost-sensitive embedded control applications. It integrates an RS08 reduced-instruction-set core running at up to 20 MHz, alongside 8KB of on-chip Flash and supporting peripherals targeted at simple sensor conditioning, user-interface handling, and battery-powered appliance control. A microcontroller (MCU) is a single-chip processing element that combines a CPU, volatile and non-volatile memory, and a programmable peripheral set in one package. RS08 microcontrollers belong to the broader 8-bit MCU category and sit below 16-bit/32-bit MCUs in the processing-performance hierarchy; they are preferred when BOM cost, deterministic interrupt latency, and low static power are more critical than raw MIPS. The RS08KB family is purpose-built for ultra-low-cost designs and pairs the CPU with integrated analog and timer resources, removing the need for external glue logic. Key differentiating features include the 20 MHz maximum CPU clock, 8KB of Flash for application firmware and calibration data, multiple timers and a multi-channel 10-bit ADC for analog signal acquisition, plus flexible low-power modes optimized for battery-backed operation. The wide-body SOIC-20 footprint simplifies hand-prototyping and visual inspection, while the RS08 instruction set keeps code density tight, often eliminating the need for an external EEPROM. According to the manufacturer product family description, the RS08KB family uses an efficient core to support interrupt-driven designs that save both component cost and PCB area. Technically, the device leverages the HCS08-derived RS08 core, which is intentionally stripped of unused addressing modes to shrink silicon area and reduce leakage. Its 20 MHz bus rate, combined with single-cycle instructions in many cases, yields sufficient throughput for slow-loop control tasks such as PWM LED driving, thermostat regulation, and simple user-interface scanning. The integrated brown-out reset and watchdog extend system reliability in harsh electrical environments. Typical applications include white-goods and small-appliance controllers, IR remote-control transmitters, low-end consumer gadgets, battery chargers, simple sensor hubs, and educational/development platforms. Designers also use the RS08KB family in industrial control panels where deterministic behavior and inexpensive replacement parts are valued. When designing with this MCU, verify that the chosen in-circuit debugger and software toolchain (CodeWarrior or MCU Eclipse) support the RS08KB sub-family before committing to firmware development, because tool support differs across HCS08 derivatives. Ensure decoupling is placed within 5 mm of the VDD pin to suppress switching transients during Flash programming. This page consolidates distributor pricing, drop-in compatible alternatives, and practical design notes that complement the RS08KB family datasheet and help engineers evaluate the part quickly.

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MC9RS08LA8CFT - 20MHz RS08 MCU with 8KB Flash | NXP
MC9RS08LA8CFT

MC9RS08LA8CFT - 20MHz RS08 MCU with 8KB Flash | NXP

The NXP Semiconductors MC9RS08LA8CFT is an 8-bit RS08 microcontroller with 20 MHz processing, 8 KB of Flash program memory, 256 bytes of RAM, 31 I/O pins, and a 48-pin QFN exposed-pad package. It operates from 3.3 V or 5 V and is designed for cost-sensitive embedded systems requiring integrated LCD-driving capability. A microcontroller is a programmable system-on-chip that integrates a CPU, memory, input/output ports, and peripherals into one device. The RS08 family belongs to the 8-bit microcontroller hierarchy, where the CPU executes compact embedded-control firmware while interacting directly with sensors, displays, relays, and communication interfaces. The LA family specifically targets small appliances, medical equipment, and industrial or multi-market products. Verified device data identifies an 8-bit RS08 CISC core, 8 KB (8K x 8) Flash memory, 256 x 8 RAM, 31 I/O pins, a 20 MHz maximum speed, an internal oscillator, and a 48-VFQFN exposed-pad package. The integrated LCD driver and charge-pump capability support display-oriented designs while reducing external support circuitry. The verified snippets also identify 3.3 V/5 V operation and tray packaging. The 20 MHz RS08 core provides sufficient control bandwidth for keypad scanning, display updates, sensor acquisition, and state-machine-based appliance control. Its 8-bit architecture simplifies instruction handling and supports economical embedded firmware. Exact peripheral inventory, memory map, interrupt behavior, ADC information, and detailed electrical limits are not available in the supplied source snippets and should be confirmed in the manufacturer datasheet. Typical applications include small appliances, medical equipment, industrial control panels, and other multi-market embedded systems. The LCD-oriented integration is particularly relevant where a compact display, keypad interface, and local control logic are needed without relying on a higher-cost MCU. The exposed thermal pad improves heat transfer on multilayer PCBs when the device dissipates power. Designers should treat the part as an end-of-life MCU and verify availability before starting a new production design. Firmware, memory map, LCD segment configuration, bypass capacitors, oscillator settings, and exposed-pad soldering must follow the official datasheet. For new designs, assess current NXP or other MCU families rather than assuming this obsolete device is a safe long-term choice. This page combines verified manufacturer and distributor information, availability context, package details, and engineering cautions. It is intended to help engineers identify whether the MC9RS08LA8CFT fits an existing embedded design while clearly separating verified facts from parameters that require datasheet confirmation.

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MC9RS08LA8CLF - 8KB Flash 8-Bit RS08 MCU w/ LCD | NXP
MC9RS08LA8CLF

MC9RS08LA8CLF - 8KB Flash 8-Bit RS08 MCU w/ LCD | NXP

The NXP MC9RS08LA8CLF is an 8-bit RS08 microcontroller with an integrated segmented LCD driver, 8KB Flash program memory, and 256 bytes of RAM, offered in a 48-pin LQFP (7x7) package. It operates at up to 20 MHz CPU clock from a 2.7V to 5.5V supply, integrating peripheral functions that target small appliances, medical equipment, and industrial multi-market applications. The device exposes 31 general-purpose I/O pins and includes an internal oscillator for BOM reduction. An 8-bit microcontroller (MCU) is a small, self-contained computing core built around an 8-bit data path, flash program memory, on-chip RAM, peripherals, and I/O. MCUs form the bottom of the embedded-computing hierarchy: 8-bit core -> microcontroller -> embedded processor -> semiconductor. The RS08 family is a streamlined HC08 subset aimed at ultra-low-cost LCD applications with active power saving modes for battery operation. Key features include an 8-Bit RS08 Central Processor Unit running up to 20 MHz, 8KB (8K x 8) of Flash, 256 bytes of RAM, 31 I/O lines, and a segment LCD driver with integrated charge pump that supports bias-multiplexed glass up to 8x mode. The on-chip charge pump eliminates the need for an external LCD bias supply. An internal oscillator is provided; an external clock source is supported for applications requiring higher timing precision. The 48-LQFP package exposes the full peripheral set. The MC9RS08LA8CLF uses the proven RS08 core with a 16-bit-wide internal architecture for fast byte-level operations, single-cycle peripheral access, and a BDM (Background Debug Mode) interface for in-system programming and debugging. The integrated charge-pump LCD driver supports 4x40 segments at 3V or 8x40 segments at 5V via the segment/large-pin multiplex arrangement, enabling direct connection to display glass without external drivers. Typical applications include white-goods user interfaces, medical monitoring front panels, industrial HMI panels, low-cost metering instruments, and battery-powered sensor readouts with on-glass LCD readouts. The active-low reset, multiple stop/wait modes, and integrated RTCC make the part well suited to mains or battery powered appliances with energy-star compliance targets. When designing with this part, the LCD charge-pump capacitor values from the reference design must be observed for proper display contrast, and the on-chip Vlcd reference must be configured to the target display glass. Plan board layout to keep the charge-pump traces short, and use proper decoupling at Vdd/Vss to minimize LCD segment rail noise visible on the display. This page synthesizes drop-in compatible alternates (where they exist), lifecycle risk flags from NXP's End-of-Life notice, and engineering guidance sourced from the manufacturer datasheet and distributor inventory. Use the comparison table to confirm pinout and peripheral set matches before substituting in a board that uses the LCD driver.

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