MC908GR48ACFAE - 8-bit HC08 MCU, 48KB Flash, 8MHz | NXP
MPN： MC908GR48ACFAE ✗ 停產MC908GR48ACFAE 概覽
An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, program memory (FLASH/ROM), data memory (RAM), and a set of peripherals such as timers, ADC, serial interfaces (SCI/SPI/IIC), and general-purpose I/O on a single die. The 8-bit HC08 family uses a CISC architecture with an accumulator-based programming model and is one of the longest-running 8-bit cores in the industry, still used today in cost-sensitive, deterministic control applications.
Key features of the MC908GR48ACFAE include 48KB of FLASH, 1.5KB of on-chip RAM, an 8-channel 8-bit ADC, multiple 16-bit timers, SCI, SPI, and IIC communication peripherals, and a wide operating voltage range of 3.3V/5V. The internal bus architecture is 8-bit, with CISC instruction execution at up to 8MHz, providing a good balance between code density, deterministic interrupt response, and ease of programming.
The HC08GR family uses a von Neumann memory architecture with FLASH as the program store and supports in-application programming through a ROM-resident monitor or background debug module. Its low-power modes (wait and stop) and integrated peripherals reduce the need for external components, enabling compact, low-BOM-count designs.
Typical applications include HVAC controllers, white goods motor control, security alarm panels, automotive body electronics (via the GR48A's operating temperature range), simple user-interface panels, and industrial sensor signal conditioning. The wide voltage tolerance and integrated peripherals also suit battery chargers and portable instrumentation.
A key design consideration is that this part belongs to an older generation; engineers evaluating new designs should weigh the HC08GR family against modern ARM Cortex-M0+ alternatives. However, for legacy system maintenance and long-life-cycle products (industrial, automotive), the MC908GR48ACFAE remains a proven, stable platform with mature toolchain support.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes for the MC908GR48ACFAE drawn from NXP/Freescale documentation and current authorized-distributor inventory, providing information not consolidated in the manufacturer datasheet.
直接替換替代品，適用於 MC908GR48ACFAE — 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： MC908GR48ACFAE （相同外形與佔位） — 差異在於 Package, RAM Size, RoHS Status, ADC, Core.
MC908GR48ACFUE
✅ 直接替換 ⚠️ 規格未經驗證聯絡詢價
查看資料表 →MC908GR48ACFAER
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
MC908GR48AVFAE
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
MC908GR48AMFAE
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
MC908AP32CFAE
✅ 直接替換聯絡詢價
查看資料表 →MC908GR48ACFAE 最大額定值與電氣特性
| Core | HC08 (8-bit CISC) |
| 資料匯流排寬度 | 8 bit |
| 最大時脈頻率 | 8 MHz |
| Program Memory Size | 48 KB FLASH |
| RAM Size | 1.5 KB |
| Program Memory Type | FLASH |
| 工作電源電壓 | 3.3 V / 5 V |
| 封裝 | 48-LQFP (7x7 mm) |
| 安裝類型 | Surface Mount |
| ADC | 8-channel 8-bit (per family datasheet, exact channels verify) |
| Timers | Multiple 16-bit timers (family-specific count) |
| Communication Interfaces | SCI, SPI, IIC |
| 工作溫度範圍 | -40C to +85C (industrial) |
| RoHS 狀態 | Compliant |
MC908GR48ACFAE 腳位配置
| 腳位 1 | IRQ — External interrupt request input |
| 腳位 2 | VSS — Ground |
| 腳位 3 | OSC1 — Crystal oscillator pin 1 |
| 腳位 4 | OSC2 — Crystal oscillator pin 2 |
| 腳位 5 | VDD — Supply voltage (3.3V/5V) |
| 腳位 6 | RESET — Reset input (active low) |
| 腳位 7 | PTD0 — General-purpose I/O / SCI TX |
| 腳位 8 | PTD1 — General-purpose I/O / SCI RX |
| 腳位 9 | PTD2 — General-purpose I/O |
| 腳位 10 | PTD3 — General-purpose I/O |
| 腳位 11 | PTD4 — General-purpose I/O / SPI |
| 腳位 12 | PTD5 — General-purpose I/O / SPI |
| 腳位 13 | PTD6 — General-purpose I/O / SPI |
| 腳位 14 | PTD7 — General-purpose I/O / SPI |
| 腳位 15 | PTE0 — General-purpose I/O / IIC SDA |
| 腳位 16 | PTE1 — General-purpose I/O / IIC SCL |
| 腳位 17 | PTE2 — General-purpose I/O |
| 腳位 18 | PTE3 — General-purpose I/O |
| 腳位 19 | PTE4 — General-purpose I/O / Timer |
| 腳位 20 | PTE5 — General-purpose I/O / Timer |
| 腳位 21 | PTE6 — General-purpose I/O / Timer |
| 腳位 22 | PTE7 — General-purpose I/O / Timer |
| 腳位 23 | PTA0 — General-purpose I/O / ADC |
| 腳位 24 | PTA1 — General-purpose I/O / ADC |
| 腳位 25 | PTA2 — General-purpose I/O / ADC |
| 腳位 26 | PTA3 — General-purpose I/O / ADC |
| 腳位 27 | PTA4 — General-purpose I/O / ADC |
| 腳位 28 | PTA5 — General-purpose I/O / ADC |
| 腳位 29 | PTA6 — General-purpose I/O / ADC |
| 腳位 30 | PTA7 — General-purpose I/O / ADC |
| 腳位 31 | PTB0 — General-purpose I/O |
| 腳位 32 | PTB1 — General-purpose I/O |
| 腳位 33 | PTB2 — General-purpose I/O |
| 腳位 34 | PTB3 — General-purpose I/O |
| 腳位 35 | PTB4 — General-purpose I/O |
| 腳位 36 | PTB5 — General-purpose I/O |
| 腳位 37 | PTB6 — General-purpose I/O |
| 腳位 38 | PTB7 — General-purpose I/O |
| 腳位 39 | PTC0 — General-purpose I/O |
| 腳位 40 | PTC1 — General-purpose I/O |
| 腳位 41 | PTC2 — General-purpose I/O |
| 腳位 42 | PTC3 — General-purpose I/O |
| 腳位 43 | PTC4 — General-purpose I/O |
| 腳位 44 | PTC5 — General-purpose I/O |
| 腳位 45 | PTC6 — General-purpose I/O |
| 腳位 46 | PTC7 — General-purpose I/O |
| 腳位 47 | VDD — Supply voltage (3.3V/5V) |
| 腳位 48 | VSS — Ground |
典型應用
MC908GR48ACFAE 適用於 7 應用s: HVAC Climate Control, White Goods Motor Drive, Security Alarm Panels, Automotive Body Electronics, Industrial Sensor Conditioning, User Interface / Keypad Panels, Battery Chargers (Small Format).
HVAC Climate Control
The MC908GR48ACFAE fits HVAC control boards where deterministic 8-bit processing is sufficient for thermostat loops, fan-speed PWM, and lcd-mode keypad scan. The HC08GR48A's 48KB FLASH holds full state-machine control code with room for sensor linearization tables, while the integrated 8-bit ADC reads thermistor inputs and the 16-bit timers drive TRIAC phase-angle control. At 5V operation it interfaces directly to legacy triac-driver circuits without level shifters, reducing BOM cost. Compared with switching to a Cortex-M0+ MCU, the HC08GR48A avoids firmware-rewrite risk on long-life HVAC platforms that may ship for 10-15 years.
推薦
White Goods Motor Drive
Washing machines, dishwashers, and dryers use the MC908GR48ACFAE for brushed/induction motor commutation, water-level sensing, and user-interface handling. The HC08GR48A's 16-bit timer channels generate center-aligned PWM at frequencies well-suited to IGBT/MOSFET motor bridges, and the SCI fast-mode channels interface to inverter-display modules. The 48KB FLASH allows the full motor-control state machine plus UI code to coexist in a single chip. Its 3.3V/5V dual-supply tolerance lets it coexist with both modern LCD modules and legacy 5V sensor rails, simplifying mixed-voltage designs common in white goods.
推薦
Security Alarm Panels
Alarm panels benefit from the MC908GR48ACFAE's low-power wait/stop modes combined with its ability to wake on external interrupts to scan wired sensor loops. The 48KB FLASH stores zone-configuration tables and event-log buffers, while the SPI fast-mode peripheral connects to LCD keypads and the SCI peripheral dials out via modem. Compared to a Cortex-M0+ upgrade, the HC08GR48A's mature firmware base and long-term availability through NXP/Rochester Electronics make it attractive for life-safety products that require predictable, decade-long silicon support.
推薦
Automotive Body Electronics
Body controllers for door modules, seat controllers, and mirror-adjustment units use the MC908GR48ACFAE because of its HC08GR core's deterministic interrupt response and integrated LIN-compatible SCI. The 48KB FLASH supports CAN/LIN stack plus body-control logic, while the wide operating temperature range suits under-dash environments. Compared with switching to S32K, the HC08GR48A allows reuse of legacy firmware libraries and proven automotive software baselines. The 48-LQFP package is widely accepted by automotive EMS providers with mature inspection processes.
推薦
Industrial Sensor Conditioning
Industrial 4-20mA loop-powered transmitters and RTD/thermocouple signal conditioners use the MC908GR48ACFAE for ADC sampling, linearization math, and HART or serial output. The 8-bit ADC combined with oversampling firmware in 48KB FLASH provides 12-bit effective resolution for temperature/pressure measurement, while the SCI peripheral talks to HART modems. Its 3.3V/5V dual-supply operation and low-power stop mode are well-suited to loop-powered applications where quiescent current must stay below 3.5mA. The HC08GR48A's proven long-term NXP support matters in industrial process plants with 20+ year service intervals.
推薦
User Interface / Keypad Panels
Elevator panels, building-automation keypads, and access-control readers use the MC908GR48ACFAE for button-matrix scanning, LED/PWM backlight control, and LCD character-display driving. The HC08GR48A's 16-bit timer channels handle debounce and backlight-dimming PWM, while the SPI port drives character-HDLC modules. With 48KB FLASH, full UI state machines plus password tables fit comfortably in a single MCU. Compared to a modern Cortex-M0+ part, the HC08GR48A remains attractive where existing UI firmware and keypad-scan libraries are certified for life-safety or regulated industries.
推薦
Battery Chargers (Small Format)
Small-format lead-acid and NiMH chargers for emergency lighting, scooters, and test gear use the MC908GR48ACFAE to implement CC/CV charge profiles with temperature-compensated voltage setpoints. The HC08GR48A's 8-bit ADC monitors charge current and battery voltage, while the 16-bit timer drives PWM into the buck converter. The 48KB FLASH allows multi-stage charge profiles plus logging, and the wide operating voltage allows direct connection to 12V battery stacks via a small LDO. Compared with newer Cortex-M0+ chargers, the HC08GR48A retains support for legacy firmware on long-life industrial battery products.
推薦
推薦產品摘要
工程參考資料，適用於 MC908GR48ACFAE — 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 | MC908GR48ACFUE | MC908GR48ACFAER | MC908GR48AVFAE | MC908GR48AMFAE | MC908AP32CFAE |
|---|---|---|---|---|---|---|
| Package | 48-LQFP (7x7) | 48-LQFP (7x7) - same | 48-LQFP (7x7) - same | 48-LQFP (7x7) - same | 48-LQFP (7x7) - same | 48-LQFP (7x7) - same |
| Brand | NXP Semiconductors | NXP Semiconductors - same | NXP Semiconductors - same | NXP Semiconductors - same | NXP Semiconductors - same | NXP Semiconductors - same |
| Core | HC08 (8-bit CISC) | HC08 (8-bit CISC) - same | HC08 (8-bit CISC) - same | HC08 (8-bit CISC) - same | HC08 (8-bit CISC) - same | HC08 (8-bit CISC) - same |
| FLASH Memory | 48 KB | 48 KB - same | 48 KB - same | 48 KB - same | 48 KB - same | 32 KB (-33%) |
| RAM Memory | 1.5 KB | 1.5 KB - same | 1.5 KB - same | 1.5 KB - same | 1.5 KB - same | 1 KB (-33%) |
| Max Clock Frequency | 8 MHz | 8 MHz - same | 8 MHz - same | 8 MHz - same | 8 MHz - same | 8 MHz - same |
| Operating Voltage | 3.3V / 5V | 3.3V / 5V - same | 3.3V / 5V - same | 3.3V / 5V - same | 3.0V / 3.3V (lower) | 3.3V / 5V - same |
| Operating Temperature | -40C to +85C | -40C to +85C - same | -40C to +85C - same | -40C to +105C (automotive) | -40C to +85C - same | -40C to +85C - same |
主要差異化特點
- Mature HC08GR architecture with 48KB FLASH in 48-LQFP (對比MC908AP32CFAE)
- Wide operating voltage (3.3V/5V dual-supply) (對比MC908GR48AMFAE)
- Industrial temperature grade vs automotive temperature (對比MC908GR48AVFAE)
設計說明
The MC908GR48ACFAE accepts 3.3V or 5V supply. Place a 100nF decoupling capacitor as close as possible to each VDD pin (the part has two VDD pins on the LQFP-48 package). Add a bulk 10uF tantalum or ceramic cap on the main supply rail near the MCU. Avoid routing high-current switching traces (motor drivers, relays) directly under the MCU's VDD pins to prevent supply noise coupling.
The 48-LQFP (7x7 mm) package has a 0.5mm pitch and benefits from generous copper pours under the exposed pad area on the top layer for thermal dissipation. Although the HC08GR48A's typical power dissipation is below 100mW, the exposed center pad (if present) should be soldered to a 5x5 mm copper island connected to VSS to maintain long-term reliability under industrial temperature cycling. Route all I/O signals on outer layers and avoid vias on signal traces entering the LQFP footprint.
Do not assume that the MC908GR48ACFAE's 48KB FLASH is byte-erasable; the HC08GR family typically uses block-erase FLASH segments, which means firmware updates must be designed around block boundaries. Also note that the part is NRND - if you are starting a new design, qualify a second-source NXP HC08GR variant or evaluate the Kinetis E-series for long-term supply security. Finally, the RESET pin requires a minimum 32-cycle low pulse; a too-short reset (e.g., from an RC with too low an RC constant) can cause intermittent boot failures.
The HC08GR48A's SCI, SPI, and IIC peripherals share I/O pins with general-purpose GPIO. When using these peripherals, ensure the firmware initializes the associated GPIO data-direction registers correctly before enabling the peripheral - a common bug is leaving GPIO set as output while the SCI/SPI peripheral is driving the same pin, causing line contention. For SPI at clock rates above 1MHz, keep SPI traces under 50mm and add a 33R series resistor near the master for ringing control.
合規資訊
RoHS and REACH compliant per manufacturer product page. Not AEC-Q100 qualified - automotive customers should use the MC908GR48AVFAE automotive-grade variant. Lead-free LQFP-48 package supports standard 260C peak reflow profiles per JEDEC J-STD-020.