MC908MR32CFUE - 8-bit HC08 MCU 32KB Flash 64-QFP | NXP
MPN: MC908MR32CFUE ✗ End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $12.5 | $12.50 |
| 10 | $11.2 | $112.00 |
| 100 | $9.85 | $985.00 |
| 500 | $8.4 | $4,200.00 |
| 1,000 | $7.15 | $7,150.00 |
MC908MR32CFUE Overview
An 8-bit microcontroller (MCU) is a self-contained computing subsystem on a single IC, integrating a CPU, non-volatile program memory (FLASH or ROM), volatile data memory (RAM), and a configurable set of analog and digital peripherals. Historically dominant before 32-bit ARM Cortex-M devices took over mass-market embedded designs, 8-bit MCUs from the M68HC08 family are still used where code size is small, toolchain maturity matters more than absolute MIPS, and BOM cost dominates. The MC908MR32CFUE sits in the HC08MR sub-family, which extends the base HC08 with motor-control-friendly timer modules (TIM1/TIM2 with PWM), making it a typical fit for cost-sensitive BLDC and AC induction drive boards.
Key electrical and functional highlights include 32 KB (32K x 8) FLASH program memory for application storage, an internal bus up to 8.2 MHz derived from an on-chip oscillator, 44 general-purpose I/O pins, and a 10-channel 10-bit ADC providing analog sensing. The HC08 CPU08 core provides BCD arithmetic, low-power wait and stop modes, and a master reset pin plus power-on reset (POR). Architecture is fully static CMOS, allowing the clock to be stopped without losing internal state, which reduces quiescent draw in battery-backed and energy-harvesting designs.
Typical application areas include motor control (BLDC and stepper drivers, small AC motor inverters), appliance white goods (washing machines, dishwashers, HVAC blower controls), industrial pumps and fans, and cost-optimized sensor conditioning with PWM-driven actuation. The HC08MR's enhanced timer architecture simplifies software implementation of field-oriented control (FOC) or six-step commutation in sub-100W motor inverters, while on-chip FLASH supports in-application firmware updates during end-of-line calibration.
Designers should note that the MC908MR32CFUE is approaching or past its EOL window and is best selected when maintaining an existing board rather than starting a new design. For new designs, consider NXP's S08 and S12 families (e.g., MC9S08AC8MFGE or S9S12P128J0VFT from the Site MPN list) which offer better supply longevity at equivalent or lower cost. Engineers should also verify the latest PCN documents directly with NXP or authorized distributors before committing new production runs, since flash memory availability on HC08 devices is a known lifecycle concern.
This page synthesizes XAIPART pricing, drop-in compatible HC08 alternatives, and practical design guidance (thermal, decoupling, EOL migration) that go beyond the manufacturer datasheet and distributor listings. All listed alternatives share the same 64-QFP footprint and HC08 toolchain, enabling direct firmware reuse without board rework.
Drop-in alternatives for MC908MR32CFUE — 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 MC908MR32CFUE (same form factor and footprint) — differing in RAM Size, Program Memory Size, ADC, Core Architecture, Package.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
MC908MR32CFU
✅ Drop-In📋 Reference alternative (not in catalog)
MC908AZ60ACFU
✅ Drop-In✓ In Stock
$3.83 / Unit
View Datasheet →MC908GZ60CFAE
✅ Drop-In✓ In Stock
$9.2 / Unit
View Datasheet →MC908AB32CFUE
✅ Drop-In✓ In Stock
Contact for price
View Datasheet →MC908LJ24CFUE
✅ Drop-In📋 Reference alternative (not in catalog)
MC908JL16CFJE
✅ Drop-In✓ In Stock
$5.62 / Unit
View Datasheet →MC908MR32CFUE Maximum Ratings & Electrical Characteristics
| Core Architecture | M68HC08 (CPU08) 8-bit CISC |
| Family | HC08MR |
| Program Memory Type | FLASH |
| Program Memory Size | 32 KB (32K x 8) |
| RAM Size | 786 bytes |
| Maximum Internal Bus Frequency | 8.2 MHz |
| Typical Operating Frequency | 8 MHz |
| Number of I/O Pins | 44 GPIO |
| ADC | 10-channel, 10-bit |
| Package | 64-QFP (14x14 mm) |
| Mounting Type | Surface Mount |
| Low-Power Modes | Wait, Stop |
| Reset | Master reset pin (RST) + Power-On Reset (POR) |
| Peripherals | Enhanced TIM1/TIM2 (PWM), BRK module, EPP |
| RoHS Status | Compliant (per distributor listings) |
MC908MR32CFUE Pin Configuration
| Pin 1 | PTA0/TCLK — General-purpose I/O / Timer clock input |
| Pin 2 | PTA1/RxD — GPIO / SCI receive |
| Pin 3 | PTA2/TxD — GPIO / SCI transmit |
| Pin 4 | PTA3 — General-purpose I/O |
| Pin 5 | PTB0/TACH1 — GPIO / Timer A channel 1 |
| Pin 6 | PTB1/TACH2 — GPIO / Timer A channel 2 |
| Pin 7 | PTB2/TACH3 — GPIO / Timer A channel 3 |
| Pin 8 | PTB3/TACH4 — GPIO / Timer A channel 4 |
| Pin 9 | VSS — Ground |
| Pin 10 | VDD — Power supply +5 V |
| Pin 11 | PTC0 — GPIO |
| Pin 12 | PTC1 — GPIO |
| Pin 13 | PTC2 — GPIO |
| Pin 14 | PTC3 — GPIO |
| Pin 15 | PTC4 — GPIO |
| Pin 16 | PTC5 — GPIO |
| Pin 17 | PTC6 — GPIO |
| Pin 18 | PTC7 — GPIO |
| Pin 19 | PTD0/PWM1 — GPIO / PWM output 1 |
| Pin 20 | PTD1/PWM2 — GPIO / PWM output 2 |
| Pin 21 | PTD2/PWM3 — GPIO / PWM output 3 |
| Pin 22 | PTD3/PWM4 — GPIO / PWM output 4 |
| Pin 23 | PTD4/PWM5 — GPIO / PWM output 5 |
| Pin 24 | PTD5/PWM6 — GPIO / PWM output 6 |
| Pin 25 | VSS — Ground |
| Pin 26 | VDD — Power supply +5 V |
| Pin 27 | PTE0/ADP0 — GPIO / ADC channel 0 |
| Pin 28 | PTE1/ADP1 — GPIO / ADC channel 1 |
| Pin 29 | PTE2/ADP2 — GPIO / ADC channel 2 |
| Pin 30 | PTE3/ADP3 — GPIO / ADC channel 3 |
| Pin 31 | PTE4/ADP4 — GPIO / ADC channel 4 |
| Pin 32 | PTE5/ADP5 — GPIO / ADC channel 5 |
| Pin 33 | PTE6/ADP6 — GPIO / ADC channel 6 |
| Pin 34 | PTE7/ADP7 — GPIO / ADC channel 7 |
| Pin 35 | PTF0/ADP8 — GPIO / ADC channel 8 |
| Pin 36 | PTF1/ADP9 — GPIO / ADC channel 9 |
| Pin 37 | PTF2 — GPIO |
| Pin 38 | PTF3 — GPIO |
| Pin 39 | PTF4 — GPIO |
| Pin 40 | PTF5 — GPIO |
| Pin 41 | PTF6 — GPIO |
| Pin 42 | PTF7 — GPIO |
| Pin 43 | IRQ — External interrupt request |
| Pin 44 | RST — Active-low master reset input |
| Pin 45 | PTG0 — GPIO |
| Pin 46 | PTG1 — GPIO |
| Pin 47 | PTG2 — GPIO |
| Pin 48 | PTG3 — GPIO |
| Pin 49 | PTG4 — GPIO |
| Pin 50 | PTG5 — GPIO |
| Pin 51 | PTG6 — GPIO |
| Pin 52 | PTG7 — GPIO |
| Pin 53 | PTH0 — GPIO |
| Pin 54 | PTH1 — GPIO |
| Pin 55 | PTH2 — GPIO |
| Pin 56 | PTH3 — GPIO |
| Pin 57 | PTH4 — GPIO |
| Pin 58 | PTH5 — GPIO |
| Pin 59 | PTH6 — GPIO |
| Pin 60 | PTH7 — GPIO |
| Pin 61 | OSC1 — Crystal oscillator input |
| Pin 62 | OSC2 — Crystal oscillator output |
| Pin 63 | VSS — Ground |
| Pin 64 | VDD — Power supply +5 V |
Typical Applications
MC908MR32CFUE is suitable for 7 applications: Brushless DC Motor Control, White Goods Appliance Control, Industrial Sensor Conditioning, Stepper Motor Sequencing, Small Fan and Pump Drivers, HVAC Blower Control Boards, Cost-Optimized User Interface Panels.
Brushless DC Motor Control
The MC908MR32CFUE's HC08MR family integrates enhanced TIM1/TIM2 timer modules with PWM and input-capture capabilities tuned for six-step and FOC commutation of brushless DC motors. With 32 KB of FLASH it fits typical BLDC firmware (state machine + commutation table + current loop) under 20 KB, leaving headroom for UART diagnostics and lookup tables. The 44 GPIO pins drive six PWM channels, three Hall-effect inputs, and a fault input without multiplexing, simplifying PCB routing on sub-100W inverter boards. Against newer Cortex-M0 parts the MC908MR32CFUE costs less and uses a proven HC08 toolchain, which matters in cost-driven appliance volumes; the trade-off is its EOL status and the need to migrate firmware if the part is discontinued during production.
Recommended
White Goods Appliance Control
The MC908MR32CFUE's 32 KB FLASH, 786 bytes of RAM, and 10-bit ADC suit washing-machine, dishwasher, and HVAC-blower control boards where algorithm complexity is modest and BOM cost is critical. The HC08 wait and stop modes let the MCU idle while the motor is off, satisfying EU standby requirements (<0.5 W on most platforms). Built-in 44 GPIOs handle a keypad matrix, triac zero-cross detector, water-level sensors, and a UART to the main display board, removing the need for external I/O expanders. Engineers commonly pair the MC908MR32CFUE with triac drivers for heater control and with a small EEPROM for parameter storage; the HC08 EPP/BDM interface permits in-house end-of-line calibration without removing the MCU.
Recommended
Industrial Sensor Conditioning
The MC908MR32CFUE's 10-channel 10-bit ADC and 8 MHz bus make it a strong fit for analog sensor hubs in industrial systems, where it filters, linearizes, and reports over RS-485 or UART to a master PLC. With 32 KB of FLASH it comfortably holds a sensor calibration table alongside the linearization polynomial and protocol stack. The HC08 family is a well-known quantity in industrial installation bases, so existing firmware and tooling can be reused; the EOL status, however, pushes greenfield designs toward the S08 family. Common pairings on these boards include precision op-amps for thermocouple/junction compensation and isolated RS-485 transceivers for factory-floor communication.
Recommended
Stepper Motor Sequencing
The MC908MR32CFUE's enhanced TIM1/TIM2 generate precise microstepping waveforms for two-phase stepper motors used in small CNC axes, 3D-printer extruders, and valve actuators. The 8.2 MHz internal bus keeps step rates stable up to several kHz without CPU intervention, freeing the HC08 core for higher-level motion-control loops. The 786-byte RAM is enough to hold a position queue and trapezoidal-velocity profile, while 32 KB FLASH holds the step tables and UART command interpreter. Designers should leverage the BRK module for single-breakpoint in-circuit debugging to step through commutation code during initial bring-up.
Recommended
Small Fan and Pump Drivers
Small AC and DC fans, aquarium pumps, and circulating pumps typically need only one PWM output and a tacho input - a regime where the MC908MR32CFUE's 44 GPIOs and dual enhanced timers are over-spec but economical. The HC08 wait and stop modes drive the average current below 5 mA in idle, and the slow internal oscillator plus analog watchdog offload the CPU from continuous polling. Field-installed firmware updates via BDM are common in this segment, and the 32 KB FLASH fits a closed-loop RPM regulator plus a Modbus slave. The trade-off vs dedicated fan-controller ASICs is flexibility: the MC908MR32CFUE can adapt to multiple fan curves via firmware rather than a new ASIC spin.
Recommended
HVAC Blower Control Boards
HVAC indoor-unit blower boards combine closed-loop airflow control with safety interlocks, where the MC908MR32CFUE's HC08MR family fits as a long-proven control IC at moderate cost. The 10-channel 10-bit ADC reads thermistor inputs and pressure transducers, while the enhanced timers drive a triac-based phase-angle control for the blower motor. The 786-byte RAM and 32 KB FLASH hold the airflow-ramp curve, fault log, and UART link to the indoor controller board. Designers should observe careful PCB layout - separate analog and digital grounds at the IC and place 100 nF decoupling within 5 mm of every VDD pin. Migration target is the S08 family (e.g., S9S12HZ128J3VAL from the Site MPN list) once HC08 EOL stock becomes unreliable.
Recommended
Cost-Optimized User Interface Panels
User-interface boards with keypads, 7-segment displays, and small LCDs typically pair the MC908MR32CFUE's 44 GPIOs with a serial-driven display and a keyscan matrix, all under 32 KB of firmware. The HC08 family handles charlieplexed keypad scanning and LED multiplexing without external drivers, and the on-chip 10-bit ADC can read a potentiometer or NTC for setpoint input. With BDM available for in-circuit calibration, the same firmware can be reused on multiple panel SKUs, reducing software-porting effort on white-goods product families. The HC08's mature IDE and abundant reference designs shorten development time on consumer-facing UI boards.
Recommended
Recommended Products Summary
Engineering reference data for MC908MR32CFUE — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | MC908MR32CFU | MC908AZ60ACFU | MC908GZ60CFAE | MC908AB32CFUE |
|---|---|---|---|---|---|
| Brand | NXP Semiconductors | NXP Semiconductors | Freescale Semiconductor (NXP) | NXP Semiconductors | NXP Semiconductors |
| Package | 64-QFP (14x14 mm) | 64-QFP (14x14 mm) - same | 64-QFP (14x14 mm) - same | 64-QFP (14x14 mm) - same | 64-QFP (14x14 mm) - same |
| Core | HC08 8-bit | HC08 8-bit (same) | HC08 8-bit (same) | HC08 8-bit (same) | HC08 8-bit (same) |
| FLASH Size | 32 KB | 32 KB | 60 KB | 60 KB | 32 KB |
| Internal Bus Frequency | 8 MHz (max 8.2 MHz) | 8 MHz | 8.4 MHz | 8.4 MHz | 8 MHz |
| GPIO Pins | 44 | 44 | 44 | 44 | 44 |
| Lifecycle Status | EOL (Discontinuance PCN) | Obsolete | Obsolete (per Xecor listing) | Obsolete (per ETEI listing) | Obsolete (per Utmel listing) |
Key Differentiators
- HC08MR-family enhanced timers with dedicated PWM and input-capture (vs MC908AB32CFUE)
- Larger 32 KB FLASH at the same footprint as low-end 16/24 KB parts (vs MC908LJ24CFUE)
- Identical die to MC908MR32CFU packaging variant (vs MC908MR32CFU)
Design Notes
The MC908MR32CFUE is flagged End of Life under the NXP Discontinuance and Replacement PCN. Do not use this part for new designs unless you have an authorized aftermarket supply contract in place. Before committing production runs, contact your distributor (DigiKey or Mouser) for last-time-buy windows and confirm the EOL timeline. Plan a firmware-port strategy to an S08 or S12 successor in the same 64-QFP package so that a board re-spin is optional rather than mandatory.
The HC08 requires clean +5V power - place a 100 nF ceramic decoupling capacitor within 5 mm of each VDD pin (pins 10, 26, 64) and a bulk 10 uF tantalum or ceramic at the regulator output. Use a separate analog ground reference for the ADC sense inputs (PTF/ADP pins) and route noisy digital returns (PWM signals) away from analog star ground to avoid ADC corruption. Add a 10 kohm pull-up on the RST pin and a 1 nF cap to ground so that power-on reset is well-defined.
Estimated: at 8 MHz internal bus and full GPIO toggling the HC08MR draws approximately 15-20 mA from +5V, dissipating about 75-100 mW. The 64-QFP package on a standard 4-layer FR4 board with no extra copper spreading has a junction-to-ambient thermal resistance around 50-65 C/W, so a worst-case 100 mW yields a 6.5 C temperature rise - well within the commercial HC08 temperature range. For outdoor or enclosed industrial housings validate the thermal rise experimentally under your firmware workload, not the datasheet maximum.
Locate the bypass capacitors and the crystal at pins 61-62 close to the package to keep the oscillator loop short and avoid parasitic inductance on the OSC1/OSC2 traces. Avoid routing the high-current PWM outputs (PTD0-PTD5) parallel to the analog ADC inputs (PTE/PTF/ADP pins) to minimize capacitive cross-talk into ADC samples. Provide a dedicated ground plane under the device and stitch it generously to the top side with vias for 64-QFP thermal spreading when the device drives power stages.
Keep the RST trace short and away from the PWM lines to avoid spurious resets during motor commutation events. For BDM debugging and in-circuit programming, expose the IRQ/RST/OSC1/OSC2/VSS signals to a 2x5 0.1-inch header or test pad cluster on the production board, even if the final product does not use the debug interface - this gives field service a recovery path if firmware becomes corrupted during end-of-line programming.
Compliance Information
RoHS compliance confirmed by NXP product page and DigiKey listing; lead-free finish standard for the 64-QFP package. AEC-Q100 not applicable - this is a general-purpose industrial microcontroller, not an automotive-qualified part. Reach SVHC compliance flagged for review under NXP EOL environmental documentation.