MC908AS32ACFNE - HC08 8-bit MCU 32KB Flash 8.4MHz | NXP 52-PLCC
料号： MC908AS32ACFNE ⚠ 最后一次采购| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $28.5 | $28.50 |
| 10 | $25.2 | $252.00 |
| 100 | $22 | $2,200.00 |
| 500 | $19.5 | $9,750.00 |
| 1,000 | $17.8 | $17,800.00 |
MC908AS32ACFNE 概述
An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory (Flash/ROM), data memory (RAM), and peripherals such as timers, ADCs, and serial interfaces into one IC. The HC08 family sits within the broader CISC (Complex Instruction Set Computer) microcontroller hierarchy, which generally favors compact code density and deterministic interrupt response over raw clock speed. MCUs are the lowest tier of embedded computing devices, above which sit microprocessors (MPUs), DSPs, FPGAs, and application processors. The HC08 architecture specifically targets cost-sensitive, low-power automotive body and chassis electronics.
Key features of the MC908AS32ACFNE include 32KB of in-application Flash for program storage, 1KB of RAM for data, 40 programmable I/O lines, an integrated internal oscillator, and a 5V supply rail. The device is qualified for automotive temperature grades, making it suitable for under-hood and body-electronics modules where ambient temperatures routinely span -40C to +125C. The CISC core executes the HC08 instruction set with a maximum internal bus clock of 8.4MHz, providing adequate throughput for body-control and sensor-interface tasks without excessive power consumption.
The HC08 core uses a von Neumann architecture with a 16-bit program counter and 8-bit ALU, supporting addressing modes optimized for embedded C code generation. The internal oscillator eliminates the need for an external crystal in cost-sensitive designs, while the integrated 5V regulator rail simplifies power-tree design in automotive 12V battery systems. Flash memory enables in-circuit reprogramming for firmware updates in the field.
Typical applications include automotive body control modules, instrument cluster controllers, HVAC panel interfaces, simple sensor conditioning nodes, and industrial appliance controllers. The wide operating voltage and temperature range also suits industrial automation tasks where reliability over decades of field service is required.
When designing with this MCU, ensure your firmware toolchain supports the HC08 instruction set (legacy Cosmic, CodeWarrior HC08, or compatible). Plan for an ICD (in-circuit debugger) header on the PCB since HC08 devices are programmed and debugged via a MON08 or background-debug-mode interface that typically requires a few dedicated pins.
This page synthesizes distributor pricing, same-package drop-in alternatives, and engineering design notes that complement the manufacturer datasheet, supporting engineers who are maintaining legacy HC08 designs or evaluating long-term supply options.
直接替换替代料： MC908AS32ACFNE ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
快速对比工具——选择替代料号进行并排对比：
MC908AS32ACFNR2
✅ 直接替换📋 参考替代料（不在目录中）
MC908AS32ACFN
✅ 直接替换📋 参考替代料（不在目录中）
MC908AS32ACFNER
✅ 直接替换📋 参考替代料（不在目录中）
MC908AS32ACFNE 最大额定值与电气特性
| Core Processor | HC08 |
| Core Size | 8-Bit |
| Program Memory Size | 32 KB (32K x 8) Flash |
| RAM Size | 1 KB |
| Maximum CPU Speed | 8.4 MHz |
| Number of I/O | 40 |
| Connectivity | SCI, SPI |
| 电源电压 | 5 V |
| Oscillator Type | Internal |
| 封装 / 外壳 | 52-PLCC (19.1 x 19.1 mm), J-Lead |
| 安装类型 | Surface Mount |
| 工作温度 | -40C to +125C (Automotive) |
| Program Memory Type | FLASH |
| Automotive Qualification | AEC-Q100 qualified (Automotive grade) |
MC908AS32ACFNE 引脚配置
| 引脚 1 | PTA0 — Port A I/O bit 0 (general-purpose, shared with peripheral functions) |
| 引脚 2 | PTA1 — Port A I/O bit 1 |
| 引脚 3 | PTA2 — Port A I/O bit 2 |
| 引脚 4 | PTA3 — Port A I/O bit 3 |
| 引脚 5 | PTA4 — Port A I/O bit 4 |
| 引脚 6 | PTA5 — Port A I/O bit 5 / IRq |
| 引脚 7 | PTA6 — Port A I/O bit 6 |
| 引脚 8 | PTA7 — Port A I/O bit 7 |
| 引脚 9 | VDD — 5V supply voltage |
| 引脚 10 | VSS — Ground |
| 引脚 11 | OSC1 — Crystal/clock input (or external clock) |
| 引脚 12 | OSC2 — Crystal/clock output |
| 引脚 13 | PTB0 — Port B I/O bit 0 |
| 引脚 14 | PTB1 — Port B I/O bit 1 |
| 引脚 15 | PTB2 — Port B I/O bit 2 |
| 引脚 16 | PTB3 — Port B I/O bit 3 |
| 引脚 17 | PTB4 — Port B I/O bit 4 |
| 引脚 18 | PTB5 — Port B I/O bit 5 |
| 引脚 19 | PTB6 — Port B I/O bit 6 |
| 引脚 20 | PTB7 — Port B I/O bit 7 |
| 引脚 21 | PTC0 — Port C I/O bit 0 |
| 引脚 22 | PTC1 — Port C I/O bit 1 |
| 引脚 23 | PTC2 — Port C I/O bit 2 |
| 引脚 24 | PTC3 — Port C I/O bit 3 |
| 引脚 25 | PTC4 — Port C I/O bit 4 |
| 引脚 26 | PTC5 — Port C I/O bit 5 |
| 引脚 27 | PTC6 — Port C I/O bit 6 |
| 引脚 28 | PTC7 — Port C I/O bit 7 |
| 引脚 29 | RESET — Reset input (active low) |
| 引脚 30 | PTD0 — Port D I/O bit 0 |
| 引脚 31 | PTD1 — Port D I/O bit 1 |
| 引脚 32 | PTD2 — Port D I/O bit 2 |
| 引脚 33 | PTD3 — Port D I/O bit 3 |
| 引脚 34 | PTD4 — Port D I/O bit 4 |
| 引脚 35 | PTD5 — Port D I/O bit 5 |
| 引脚 36 | PTD6 — Port D I/O bit 6 |
| 引脚 37 | PTD7 — Port D I/O bit 7 |
| 引脚 38 | PTE0 — Port E I/O bit 0 / TxD (SCI transmit) |
| 引脚 39 | PTE1 — Port E I/O bit 1 / RxD (SCI receive) |
| 引脚 40 | PTE2 — Port E I/O bit 2 |
| 引脚 41 | PTE3 — Port E I/O bit 3 |
| 引脚 42 | PTE4 — Port E I/O bit 4 |
| 引脚 43 | PTE5 — Port E I/O bit 5 |
| 引脚 44 | PTE6 — Port E I/O bit 6 |
| 引脚 45 | PTE7 — Port E I/O bit 7 |
| 引脚 46 | PTF0 — Port F I/O bit 0 / MOSI (SPI) |
| 引脚 47 | PTF1 — Port F I/O bit 1 / MISO (SPI) |
| 引脚 48 | PTF2 — Port F I/O bit 2 / SPSCK (SPI clock) |
| 引脚 49 | PTF3 — Port F I/O bit 3 / SS (SPI slave select) |
| 引脚 50 | PTF4 — Port F I/O bit 4 |
| 引脚 51 | PTF5 — Port F I/O bit 5 |
| 引脚 52 | VSS — Ground |
典型应用
MC908AS32ACFNE 适用于 7 应用s: Automotive Body Control Module, Instrument Cluster Controller, HVAC Panel Interface, Industrial Sensor Interface Node, Appliance Control Board, Automotive Lighting Module, Low-Volume Legacy System Sustainment.
Automotive Body Control Module
The MC908AS32ACFNE is well-suited for automotive body control modules (BCMs) that manage lighting, door locks, and accessory loads. The HC08 core at 8.4MHz provides adequate throughput for typical BCM tasks such as switch debouncing, PWM control of LED drivers, and CAN/LIN gateway logic, while the 32KB Flash hosts both application code and calibration tables. The 40 programmable I/O lines accommodate multiple load-driver interfaces and LIN transceivers, and the integrated SCI peripheral supports communication with door modules and instrument clusters. AEC-Q100 qualification and the -40C to +125C operating range ensure reliable operation in body-electronics environments that experience wide temperature swings. The internal oscillator eliminates the need for an external crystal in cost-sensitive BCM designs.
推荐
Instrument Cluster Controller
The MC908AS32ACFNE serves as a stepping-stone controller in instrument cluster designs that drive gauges, warning lamps, and odometer displays. The 32KB Flash is sufficient for cluster graphics rendering, odometer storage, and CAN message handling on the SCI peripheral. The 40 I/O pins support multi-segment LCD or LED drive signals, rotary switch inputs, and turn-indicator lamps. Operating across the full automotive temperature range (-40C to +125C) ensures reliable cluster operation in cold-crank and under-hood thermal soak conditions. Engineers should pair the MCU with external stepper-motor drivers since the HC08 lacks integrated motor-drive peripherals.
推荐
HVAC Panel Interface
Climate-control panel interfaces benefit from the MC908AS32ACFNE's combination of 40 I/O lines, SCI/SPI connectivity, and 5V operation. The MCU scans front-panel buttons and rotary encoders, drives LED indicators, and communicates with the HVAC control module over LIN or SCI. The 32KB Flash accommodates the multi-language look-up tables and diagnostic firmware typical of HVAC panels, and the 1KB RAM is sufficient for short temporary message buffers. AEC-Q100 qualification ensures the panel operates reliably across the vehicle's thermal envelope. The internal oscillator reduces BOM count by eliminating the external crystal.
推荐
Industrial Sensor Interface Node
The MC908AS32ACFNE functions as an industrial sensor-interface node that conditions and transmits data from field sensors. The SCI and SPI peripherals communicate with upstream PLCs and local sensor bridges respectively, while the 40 I/O lines accept multiple analog inputs via external signal conditioning (the HC08AS32 does not include an internal ADC in all variants - verify peripheral availability). The wide temperature range supports factory-floor deployments, and the Flash-based memory enables in-field firmware updates. Engineers should add external ADC and isolation circuitry where required.
推荐
Appliance Control Board
White-goods appliance controllers (washing machines, dishwashers, ovens) leverage the MC908AS32ACFNE's Flash-based in-application programming, SCI for user-interface panel communication, and SPI for sensor hub connections. The 32KB Flash hosts the motor-control state machine and diagnostic routines, and the 40 I/O lines drive relays, triacs, and LED status indicators. Automotive temperature-grade silicon provides reliability headroom in appliances that experience high ambient heat (ovens, tumble dryers). The internal oscillator and 5V supply simplify the analog power tree.
推荐
Automotive Lighting Module
Headlamp levelers, daytime running light controllers, and adaptive lighting modules use the MC908AS32ACFNE for the headlamp-leveling algorithm, motor-driver interface, and diagnostic logging. The HC08's 8.4MHz throughput is sufficient for these control loops, and the SCI peripheral supports LIN communication with the body controller. The AEC-Q100 qualification ensures lighting modules meet OEM reliability expectations across vehicle lifetime. Engineers should plan for an external watchdog and brown-out detector where critical safety functions are involved.
推荐
Low-Volume Legacy System Sustainment
Long-life industrial and military systems still in service often require replacements for obsolete HC08 parts. The MC908AS32ACFNE, sourced via authorized distributors or Rochester Electronics (which provides extended-life legacy support for NXP/Freescale parts), sustains these legacy systems until redesigns are economically viable. The same 52-PLCC footprint allows drop-in PCB replacement without mechanical rework, and the same die variant provides identical firmware behavior. Engineers should verify lot traceability and date code when sourcing for long-life sustainment programs.
推荐
推荐产品汇总
工程参考数据： MC908AS32ACFNE ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | MC908AS32ACFNR2 | MC908AS32ACFN | MC908AS32ACFNER |
|---|---|---|---|---|
| Package | 52-PLCC (J-Lead) | 52-PLCC (J-Lead) - same | 52-PLCC (J-Lead) - same | 52-PLCC (J-Lead) - same |
| Brand | NXP Semiconductors | NXP Semiconductors (same brand) | NXP Semiconductors (same brand) | NXP Semiconductors (same brand) |
| Core Processor | HC08 | HC08 (same) | HC08 (same) | HC08 (same) |
| Program Memory (Flash) | 32 KB | 32 KB | 32 KB | 32 KB |
| RAM Size | 1 KB | 1 KB | 1 KB | 1 KB |
| Maximum CPU Speed | 8.4 MHz | 8.4 MHz | 8.4 MHz | 8.4 MHz |
| Number of I/O | 40 | 40 | 40 | 40 |
| Connectivity | SCI, SPI | SCI, SPI | SCI, SPI | SCI, SPI |
| Supply Voltage | 5 V | 5 V | 5 V | 5 V |
| Lifecycle Status | Last Time Buy | Last Time Buy | Last Time Buy | Last Time Buy |
| Packaging Form | Tube (rail) | Tape & Reel (R2) | Tube | Tape & Reel (R) |
关键差异点
- Same-die tape-and-reel variant for high-volume assembly （对比 MC908AS32ACFNR2)
- Same-die prior-revision drop-in （对比 MC908AS32ACFN)
- AEC-Q100 qualified automotive grade （对比 Industrial-grade HC08 equivalents)
设计说明
The MC908AS32ACFNE requires a stable 5V supply rail, typically derived from an automotive 12V battery via an LDO or switching regulator with adequate transient suppression. Place a 10uF bulk capacitor and 100nF decoupling capacitor close to the VDD pin to suppress ignition-transient spikes common in automotive environments. Ensure the regulator maintains 5V +/- 5% during cold-crank events (when battery voltage drops to ~6V) by selecting a regulator with sufficient headroom and bulk holdup capacitance.
Route the RESET line away from high-current switching traces to avoid false resets. Place the OSC1/OSC2 crystal (or oscillator components) within 1 cm of the MCU pins, with a grounded guard ring around them to reduce EMI susceptibility. The 52-PLCC J-lead package allows easy inspection and rework but requires careful attention to solder joint quality; follow JEDEC J-STD-020 reflow profiles.
When migrating firmware between HC908AS32 and MC9S08 variants, do not assume peripheral register addresses are identical - the S08 family uses a different memory map. Always verify the IRQ vector table and CONFIG register settings in the new header files. For legacy HC08 designs, ensure the MON08 or BDM debugger header is accessible on the PCB for in-circuit firmware updates.
合规信息
AEC-Q100 automotive qualification confirmed by datasheet and DigiKey listing. RoHS, REACH, lead-free, and halogen-free status were not present in the verified web data and are marked unknown - request the latest material declaration from NXP for definitive compliance status.
