MC9S08SE8CRL - 20MHz 8-bit MCU with 8KB Flash | NXP
MPN： MC9S08SE8CRL ✗ 停產MC9S08SE8CRL 概覽
A microcontroller is a programmable semiconductor that combines a CPU, memory, and peripherals in one integrated device. The MC9S08SE8 belongs to the S08 family of 8-bit microcontrollers, a category commonly used for embedded control in appliances, industrial equipment, access systems, and compact consumer products. Its low-cost architecture provides a practical platform for reading inputs, controlling outputs, and executing firmware without a separate processor and support chips.
The MC9S08SE8CRL's principal features include a 20 MHz HCS08 CPU, 8 KB flash memory, 512 bytes of RAM, 24 I/O lines, and operation across 3.3 V and 5 V supply levels. Listed peripherals include SCI communication, LIN bus capability, PWM, low-voltage detection, and power-on reset. These functions support connected embedded products without requiring a higher-complexity processor architecture.
The HCS08 CPU operates at up to 20 MHz while the internal bus runs at 10 MHz. Flash memory supports firmware storage, while the 512-byte RAM provides working space for stack variables, register data, and short routines. The 24 available I/O pins allow external sensors, switches, indicators, actuators, and communication interfaces to be connected while leaving four package pins dedicated to power and control functions.
Typical applications include appliance controllers, industrial interfaces, motor-control helpers, access-control equipment, and low-cost embedded control modules. SCI and LIN connectivity are useful when the controller must communicate with sensors, actuators, service tools, or other embedded nodes. PWM is applicable to lighting, fan, and basic motor-control functions, while the 5 V-compatible operating range supports conventional industrial and consumer electronics.
When designing a PCB for this part, use the manufacturer datasheet pin description table to assign every 28-pin PDIP lead and preserve the required power connections. Review reset, clock, and programming interfaces before final routing. Because this is a legacy 8-bit MCU with a limited memory footprint, software should be sized around 8 KB of flash and 512 bytes of RAM rather than assuming resources comparable with a 32-bit microcontroller.
This product record combines the manufacturer data sheet and reference manual with package details, interface characteristics, lifecycle information, and practical selection guidance. It also distinguishes the target from nearby devices whose memory, clock speed, package, or product status make them unsuitable as literal PCB drop-in replacements.
直接替換替代品，適用於 MC9S08SE8CRL — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： MC9S08SE8CRL （相同外形與佔位） — 差異在於 Mounting Type, Package, Program Memory Size, Series, Supply Voltage.
此產品無可直接替換的替代品。
申請替代品MC9S08SE8CRL 最大額定值與電氣特性
| Microcontroller Type | 8-bit HCS08 microcontroller |
| Maximum CPU Clock Frequency | 20 MHz |
| Internal Bus Frequency | 10 MHz |
| Flash Memory | 8 KB |
| RAM | 512 bytes |
| Number of I/O Pins | 24 pins |
| Total Package Pins | 28 pins |
| 供應電壓 | 3.3 V to 5 V |
| Architecture | 8-bit S08 CISC |
| Series | MC9S08SE |
| Communication Interface | SCI and LIN bus |
| Peripheral Features | PWM, low-voltage detection, and power-on reset |
| Package Type | 28-pin PDIP |
| Package Width | 0.600 in (15.24 mm) |
| 安裝類型 | Through-hole |
| Program Memory | Flash |
MC9S08SE8CRL 0.600 in (15.24 mm) 腳位配置指南
MC9S08SE8CRL（0.600 in (15.24 mm) 封裝）的腳位配置。 此數位 IC 包含 GPIO、通訊介面（UART、SPI、I2C）與電源腳位。替代腳位功能與配置選項請參閱製造商資料表。對嵌入式系統設計與 PCB 佈局至關重要。
無詳細腳位定義資料： MC9S08SE8CRL.
請參閱 資料表 以查看完整腳位配置。
典型應用
MC9S08SE8CRL 適用於 6 應用s: Appliance Control, Industrial Sensor Interface, Access Control Module, LED and Lighting Controller, Basic Motor and Fan Control, LIN Network Node.
Appliance Control
The MC9S08SE8CRL fits compact appliance controllers that combine digital inputs, relay or indicator outputs, and a serial service interface. Its 24 I/O pins provide useful connection density in a 28-pin PDIP package, while 8 KB of flash accommodates the control program and 512 bytes of RAM supports compact working data. The 3.3 V to 5 V operating range accommodates conventional control electronics. SCI can connect the controller to a host or service tool, while PWM is useful for motor, fan, or dimming functions. Because RAM is limited, the application should use small state structures and avoid unnecessary buffering.
Industrial Sensor Interface
The MC9S08SE8CRL can serve as a low-cost interface between digital sensors, switches, and an industrial communication node. Its 24 I/O lines support multiple inputs and outputs, and the 20 MHz HCS08 CPU provides faster execution than lower-speed members of the same family. SCI offers a practical path to a host computer or module, while LIN can support distributed low-speed nodes when the system architecture uses that bus. Low-voltage detection and power-on reset strengthen startup behavior. Firmware should minimize RAM buffering and validate timing against the 10 MHz internal bus and peripheral clock requirements.
Access Control Module
A keypad, reader, relay, and status-indicator system can use the MC9S08SE8CRL as a dedicated embedded controller. The target offers 24 I/O pins for switches, indicator drives, and supervisory signals, plus 8 KB of flash for firmware and 512 bytes of RAM for session state. SCI provides a connection to a higher-level controller or configuration tool. Power-on reset helps establish a known startup state, while low-voltage detection can flag a degraded supply. Designers should use the manufacturer pin table to identify any shared or multifunction pins before allocating the external reader and keypad interfaces.
LED and Lighting Controller
The MC9S08SE8CRL is appropriate for simple lighting systems that need several switched outputs, status feedback, and programmable behavior. PWM can generate adjustable drive or dimming signals, while the 24 available I/O pins can support buttons, indicators, and external driver-control lines. The 3.3 V to 5 V range allows the MCU to operate alongside conventional low-voltage control logic. Its 8 KB flash budget is suitable for a focused lighting routine rather than a large graphical application. Firmware should include output defaults and timing protection so that an MCU reset does not unintentionally energize connected lighting hardware.
Basic Motor and Fan Control
The MC9S08SE8CRL can supervise small motors, fans, or pumps where a dedicated motion controller is unnecessary. PWM supports speed-command or valve-control functions, and the 24 I/O pins provide room for sensors, limit switches, fault inputs, and driver-enable signals. The 20 MHz CPU can execute control and protection logic, although the 512-byte RAM requires careful state management. SCI can expose diagnostics to a system controller. Because the MCU does not directly replace a power-stage driver, use suitable transistor or gate-driver circuitry and preserve the manufacturer's recommended voltage and timing limits.
LIN Network Node
The MC9S08SE8CRL suits a low-cost LIN-connected node that gathers switch or sensor inputs and reports them over the network. Its listed LIN bus capability, SCI interface, and 24 I/O pins cover common distributed-control functions without a larger processor. The 8-bit S08 architecture is appropriate for deterministic tasks such as input sampling, debouncing, periodic reporting, and fault flags. With 8 KB of flash and 512 bytes of RAM, the design should keep protocol data compact and avoid large histories. Use the MC9S08SE8 reference manual to configure the LIN module, interrupts, baud-rate generation, and pin multiplexing correctly.
工程參考資料，適用於 MC9S08SE8CRL — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 |
|---|---|
| Package | 28-pin PDIP |
| Brand | NXP Semiconductors |
| CPU Architecture | 8-bit S08 CISC |
| Maximum CPU Frequency | 20 MHz |
| Internal Bus Frequency | 10 MHz |
| Flash Memory | 8 KB |
| RAM | 512 bytes |
| Number of I/O Pins | 24 pins |
| Supply Voltage | 3.3 V to 5 V |
| Communication Interfaces | SCI and LIN bus |
| Product Status | Obsolete |
主要差異化特點
- Higher clock rating than the reduced S08SE4 member (對比MC9S08SE4)
- More flash and RAM than the reduced S08SE4 member (對比MC9S08SE4)
- Through-hole 28-pin package supports simple prototyping (對比MC9S08SH8CTG)
- Lower clock rating than the listed 40 MHz GT8 device (對比MC9S08GT8ACFBE)
設計說明
Use the 28-pin PDIP footprint and assign every lead from the MC9S08SE8 data-sheet pin-description table. The package provides 24 I/O pins, so the remaining leads should be checked for power, ground, reset, clock, programming, and other fixed functions before assigning external circuitry. Preserve adequate clearance around the socket or through-hole pattern, and route sensitive clock or programming connections away from high-current switching nodes.
Design the supply path for the listed 3.3 V to 5 V operating range and follow the manufacturer recommendations for decoupling, reset, and power-on behavior. Include local bulk and high-frequency bypass capacitors where directed by the data sheet, and ensure external pull networks and driver outputs do not exceed the permitted input levels. Verify brownout behavior because low-voltage detection and power-on reset depend on correct supply sequencing.
Treat the 8 KB flash and 512-byte RAM as hard design limits, not merely starting capacities. Include interrupt stack depth, communication buffers, and temporary library variables when sizing memory. Do not assume that software developed for MC9S08SE4 or another S08 member will transfer unchanged to the SE8 because CPU timing, clock setup, peripheral behavior, and available memory can differ.
Separate analog or sensitive sensor paths from relay, motor, and mains-derived switching circuits. Keep the MCU ground and signal returns compact, use a deliberate ground strategy, and avoid routing communications and programming signals alongside high-current outputs. For SCI or LIN nodes, follow the reference manual's required transceiver connections and termination arrangement rather than treating the bus pins as ordinary general-purpose outputs.
合規資訊
No specific compliance declaration was identified for the exact MC9S08SE8CRL ordering code. Confirm RoHS, REACH, lead-free, halogen-free, and conflict-minerals status with the current manufacturer or channel documentation before using the part in a regulated production program.