MC908GR32AMFUE - 8-bit HC08 MCU 32KB Flash 64-QFP | NXP
MPN: MC908GR32AMFUE ⚠ Last Time Buy| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $14.76 | $14.76 |
| 10 | $13.29 | $132.90 |
| 100 | $11.81 | $1,181.00 |
| 500 | $10.5 | $5,250.00 |
| 1,000 | $9.45 | $9,450.00 |
MC908GR32AMFUE Overview
A microcontroller (MCU) is a single-chip computer that integrates a CPU, non-volatile program memory (Flash or ROM), volatile working memory (RAM), and a set of peripheral blocks such as timers, ADCs, serial interfaces, and GPIO. Within the broader taxonomy, the MC908GR32AMFUE belongs to the class of embedded microcontrollers -> 8-bit microcontrollers -> HC08 family microcontrollers -> general-purpose MCUs -> microcontrollers and microprocessors -> semiconductors. Its 8-bit CISC architecture, on-chip Flash, and rich peripheral mix position it as a workhorse for cost-sensitive, deterministic control applications.
Key features include 32KB of in-application Flash (32K x 8), 1.5KB of RAM, an internal bus frequency up to 8 MHz, a 10-bit successive-approximation ADC, multiple timers (TIM1/TIM2 with PWM), an SCI serial interface, and an SPI-compatible interface. System protection features include a low-voltage inhibit (LVI), computer-operating-properly (COP) watchdog, illegal-address and illegal-opcode resets, and a Flash security feature for code protection. The device operates across 3.0V to 5.5V supply ranges, supporting both 3.3V and 5V system designs.
From an architectural standpoint, the CPU08 core combines a CISC instruction set with HC05-compatible addressing modes for easy migration of legacy code, while on-chip Flash allows field re-programmability for firmware updates. The peripheral set is mapped to dedicated I/O pins, with interrupt-driven I/O supported through a vectored interrupt controller. Compared with 16-bit and 32-bit MCUs of the same era, the GR32 trades raw MIPS for deterministic interrupt latency and a smaller, more predictable instruction pipeline.
Typical applications include consumer appliance control, industrial sensor-interface modules, automotive body controllers, motor-control sub-systems, and general-purpose embedded control boards. It is also commonly used in 5V and 3.3V mixed-voltage designs that need a low-cost Flash MCU with both analog and digital peripherals on chip. The 64-QFP footprint provides ample I/O for keypad scanning, LED or LCD drive, and multiple communication interfaces in parallel.
When designing with this part, note that it is now in NXP's End-of-Life (EOL) status, so new designs should evaluate the S08 family (Freescale/NXP) or compatible 8-bit Flash MCUs as active replacements. Existing designs should plan for last-time-buy inventory to bridge the gap. Always verify the temperature grade (-40C to +125C for the 'A' suffix, automotive) and package code (FUE = PQFP-64, tray) against your mechanical and environmental requirements.
This page synthesizes distributor stock levels, drop-in compatible parts from the same HC08 family, and practical design considerations that go beyond the manufacturer datasheet to support last-time-buy and migration decisions.
Drop-in alternatives for MC908GR32AMFUE — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with MC908GR32AMFUE (same form factor and footprint).
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
MC908GR32ACFUE
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$5.25 / Unit
View Datasheet →MC908GR32VFUER
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
MC908GR32CFUE
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
MC908GR32AMFUE Maximum Ratings & Electrical Characteristics
| Core Architecture | M68HC08 (CPU08), 8-bit CISC |
| Program Memory | 32 KB Flash (32K x 8) |
| RAM | 1.5 KB |
| Internal Bus Frequency | Up to 8 MHz |
| Supply Voltage Range | 3.0 V to 5.5 V (3.3 V / 5 V systems) |
| Package | 64-pin QFP / PQFP-64 (14 x 14 mm) |
| Mounting Type | Surface Mount |
| Operating Temperature Range | -40 C to +125 C (automotive 'A' suffix) |
| ADC | 10-bit successive-approximation |
| Timers | TIM1, TIM2 with PWM channels |
| Serial Interfaces | SCI (UART) and SPI |
| Watchdog | COP (computer-operating-properly) watchdog |
| System Protection | LVI, illegal-address reset, illegal-opcode reset, Flash security |
| I/O Count | Up to 53 general-purpose I/O pins |
MC908GR32AMFUE Pin Configuration
| Pin 1 | IRQ — External interrupt request input |
| Pin 2 | RST — Reset input (active low) |
| Pin 3 | TCLK — Timer clock input |
| Pin 4 | PTA0 — Port A bit 0 / KBI0 |
| Pin 5 | PTA1 — Port A bit 1 / KBI1 |
| Pin 6 | PTA2 — Port A bit 2 / KBI2 |
| Pin 7 | PTA3 — Port A bit 3 / KBI3 |
| Pin 8 | PTA4 — Port A bit 4 / KBI4 |
| Pin 9 | PTA5 — Port A bit 5 / KBI5 |
| Pin 10 | PTA6 — Port A bit 6 / KBI6 |
| Pin 11 | PTA7 — Port A bit 7 / KBI7 |
| Pin 12 | PTB0 — Port B bit 0 / ADC channel |
| Pin 13 | PTB1 — Port B bit 1 / ADC channel |
| Pin 14 | VDD — Positive supply voltage (3.0V-5.5V) |
| Pin 15 | VSS — Ground reference |
| Pin 16 | PTB2 — Port B bit 2 / ADC channel |
| Pin 17 | PTB3 — Port B bit 3 / ADC channel |
| Pin 18 | PTB4 — Port B bit 4 / ADC channel |
| Pin 19 | PTB5 — Port B bit 5 / ADC channel |
| Pin 20 | PTB6 — Port B bit 6 / ADC channel |
| Pin 21 | PTB7 — Port B bit 7 / ADC channel |
| Pin 22 | PTC0 — Port C bit 0 / Timer channel |
| Pin 23 | PTC1 — Port C bit 1 / Timer channel |
| Pin 24 | PTC2 — Port C bit 2 / Timer channel |
| Pin 25 | PTC3 — Port C bit 3 / Timer channel |
| Pin 26 | PTC4 — Port C bit 4 / SPI SCK |
| Pin 27 | PTC5 — Port C bit 5 / SPI MOSI |
| Pin 28 | PTC6 — Port C bit 6 / SPI MISO |
| Pin 29 | PTC7 — Port C bit 7 / SPI SS |
| Pin 30 | PTD0 — Port D bit 0 / SCI TXD |
| Pin 31 | PTD1 — Port D bit 1 / SCI RXD |
| Pin 32 | PTD2 — Port D bit 2 |
| Pin 33 | PTD3 — Port D bit 3 |
| Pin 34 | PTD4 — Port D bit 4 |
| Pin 35 | PTD5 — Port D bit 5 |
| Pin 36 | PTD6 — Port D bit 6 |
| Pin 37 | PTD7 — Port D bit 7 |
| Pin 38 | PTE0 — Port E bit 0 / Timer channel |
| Pin 39 | PTE1 — Port E bit 1 / Timer channel |
| Pin 40 | PTE2 — Port E bit 2 / Timer channel |
| Pin 41 | PTE3 — Port E bit 3 / Timer channel |
| Pin 42 | PTE4 — Port E bit 4 |
| Pin 43 | PTE5 — Port E bit 5 |
| Pin 44 | PTE6 — Port E bit 6 |
| Pin 45 | PTE7 — Port E bit 7 |
| Pin 46 | PTF0 — Port F bit 0 |
| Pin 47 | PTF1 — Port F bit 1 |
| Pin 48 | PTF2 — Port F bit 2 |
| Pin 49 | PTF3 — Port F bit 3 |
| Pin 50 | PTF4 — Port F bit 4 |
| Pin 51 | PTF5 — Port F bit 5 |
| Pin 52 | PTF6 — Port F bit 6 |
| Pin 53 | PTF7 — Port F bit 7 |
| Pin 54 | PTG0 — Port G bit 0 |
| Pin 55 | PTG1 — Port G bit 1 |
| Pin 56 | PTG2 — Port G bit 2 |
| Pin 57 | VDDA — Analog supply voltage for ADC |
| Pin 58 | VSSA — Analog ground for ADC |
| Pin 59 | PTG3 — Port G bit 3 |
| Pin 60 | PTG4 — Port G bit 4 |
| Pin 61 | PTG5 — Port G bit 5 |
| Pin 62 | PTG6 — Port G bit 6 |
| Pin 63 | PTG7 — Port G bit 7 |
| Pin 64 | OSC1 — Crystal oscillator input |
Typical Applications
MC908GR32AMFUE is suitable for 6 applications: Industrial Sensor Interface Module, Consumer Appliance Control Board, Automotive Body Controller, Motor Control Subsystem, Embedded Control Development Platform, Point-of-Sale Terminal Peripherals.
Industrial Sensor Interface Module
The MC908GR32AMFUE fits industrial 4-20 mA / 0-10V sensor-interface modules because its 10-bit ADC and 8 MHz CPU08 core deliver adequate conversion throughput for thermocouple, RTD, and strain-gauge front ends. With 32KB Flash and 1.5KB RAM the device holds typical linearization lookup tables and small protocol stacks (Modbus RTU slave) without external memory. The SCI (UART) port talks directly to RS-485 transceivers at 9600-115200 baud, while the SPI bus drives a front-end DAC for re-transmission. Operating from a 24V bus regulated to 5V or 3.3V, the wide supply range (3.0V-5.5V) and integrated LVI/COOP watchdog protect against brown-out events common in industrial cabinets. The automotive-grade -40C to +125C range also supports outdoor cabinet installations.
Recommended
Consumer Appliance Control Board
The MC908GR32AMFUE is widely used in washing-machine, dishwasher, and microwave-oven control boards where cost, deterministic timing, and proven code-reuse from the HC05 family matter most. Its 53 GPIO pins drive 7-segment / LCD displays, keypad matrices, and triac-fired relays directly, while the two PWM-capable timers generate motor control signals for universal motors and BLDC fans. The 32KB Flash stores menu logic and fault diagnostics, and the COP watchdog plus illegal-opcode reset prevent lock-up in unattended home environments. Operating from a 5V rail derived from the appliance SMPS, the MCU handles 3.0V-5.5V supply variation without regulation rework.
Recommended
Automotive Body Controller
MC908GR32AMFUE's automotive 'A' temperature grade (-40C to +125C) and on-chip CAN-friendly timers (with external CAN controller) make it a fit for body controllers in older vehicle platforms - door modules, seat controllers, and lighting ECUs. The 32KB Flash holds door-lock sequencing, mirror-position memory, and PWM dimming maps for ambient lighting, while the 10-bit ADC reads battery voltage, switch positions, and thermistor inputs. The COP watchdog and LVI provide ASIL-friendly fault detection at MCU level, and the SCI port links to a LIN transceiver for sub-network communication with the BCM. Designers migrating off this part should consider the NXP S08GR family or modern S12Z devices for new platforms.
Recommended
Motor Control Subsystem
The MC908GR32AMFUE suits brushed-DC and small universal-motor control sub-systems thanks to its two timer modules with PWM outputs and its fast ADC sampling for current feedback. At 8 MHz bus the MCU computes commutation tables and PI loops with sub-100 microsecond cycle times, sufficient for small pumps, fans, and valve actuators. The 32KB Flash holds sensorless back-EMF zero-cross tables or Hall-sensor decoding maps, while the SPI port drives external gate drivers or digital potentiometers for closed-loop setpoint control. PWM frequency up to several kHz combined with hardware dead-time capability (via timer channels) avoids shoot-through in H-bridge power stages.
Recommended
Embedded Control Development Platform
The MC908GR32AMFUE serves as the central controller in low-cost 8-bit teaching kits and hobby embedded platforms because of its simple CISC instruction set, well-documented register map, and upward compatibility with the M68HC05 object code. Engineering curricula use the part to teach timer/PWM, ADC, and serial-port fundamentals without the complexity of 32-bit ARM cores. The 32KB Flash is large enough to host a real RTOS-like scheduler, while the 64-QFP package is hand-solderable with care on breakout boards. Although EOL, the device remains popular in legacy academic and prototype environments.
Recommended
Point-of-Sale Terminal Peripherals
MC908GR32AMFUE fits cost-sensitive POS peripherals such as barcode scanners, receipt printers, and customer displays where its Flash and RAM are sufficient for simple character-based protocols and keypad input handling. The SPI port drives character LCDs, the SCI talks to the terminal host, and the GPIO matrix scans 4x4 keypads. Operating from a regulated 5V or 3.3V rail, the part tolerates the wide-supply environment typical of retail back-office equipment with poor power conditioning.
Recommended
Recommended Products Summary
Engineering reference data for MC908GR32AMFUE — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | MC908GR32ACFUE | MC908GR32VFUER | MC908GR32CFUE |
|---|---|---|---|---|
| Package | 64-pin QFP (PQFP-64, 14x14 mm) | 64-QFP (PQFP-64) - same | 64-QFP (PQFP-64) - same | 64-QFP (PQFP-64) - same |
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors |
| Core | M68HC08 (CPU08) 8-bit CISC | M68HC08 (CPU08) - same | M68HC08 (CPU08) - same | M68HC08 (CPU08) - same |
| Flash Memory | 32 KB | 32 KB - same | 32 KB - same | 32 KB - same |
| RAM | 1.5 KB | 1.5 KB - same | 1.5 KB - same | 1.5 KB - same |
| Internal Bus Frequency | Up to 8 MHz | Up to 8 MHz - same | Up to 8 MHz - same | Up to 8 MHz - same |
| Supply Voltage | 3.0 V to 5.5 V | 3.0 V to 5.5 V - same | 3.0 V to 5.5 V - same | 3.0 V to 5.5 V - same |
| Temperature Grade | Automotive -40C to +125C (AM) | Industrial -40C to +85C (A) | Automotive -40C to +125C (V) | Commercial 0C to +70C (C) |
| Pin Count | 64 | 64 - same | 64 - same | 64 - same |
| Lifecycle Status | Last-Time-Buy / EOL | Last-Time-Buy / EOL | Last-Time-Buy / EOL | Last-Time-Buy / EOL |
Key Differentiators
- Same die with broader automotive temperature window (vs MC908GR32ACFUE)
- Tray packaging versus tape-and-reel (vs MC908GR32VFUER)
- Wider temperature range than commercial variant (vs MC908GR32CFUE)
Design Notes
MC908GR32AMFUE requires a regulated 3.0V-5.5V supply with adequate decoupling: 100 nF ceramic + 10 uF bulk within 5 mm of VDD/VSS pins, plus separate analog supply filtering (ferrite bead + 100 nF) on VDDA/VSSA if ADC accuracy matters. The on-chip LVI should be enabled to prevent code corruption during brown-out events common in industrial 24V-bus powered systems.
The 64-QFP (14x14 mm) package has 0.8 mm pitch leads - a 4-layer PCB with continuous ground plane is recommended to keep lead-impedance low for the 8 MHz bus and the PWM outputs. Route the crystal traces (OSC1/OSC2) short and shield them with a ground guard ring to avoid noise injection into the ADC reference.
Because this MCU is in last-time-buy, do not specify it for new designs - migrate to the NXP S08GR32 or S08GR60 family, which is in active production and uses the same HC08 instruction set with newer peripherals. If the design must use the GR32, place a last-time-buy order large enough to cover the expected production lifetime and qualify a secondary source (S08 or compatible 8-bit Flash MCU) for fallback.
Compliance Information
AEC-Q100 is not formally listed in the verified distributor data for this part; automotive grade is indicated only by the 'A' temperature suffix (-40C to +125C). RoHS and halogen-free status were not present in the provided web data and are marked unknown. Lead-free is implied by the 64-QFP tray packaging and standard NXP ordering scheme.
