MC68HC908GR8CFA - 8-Bit HC08 MCU, 7.5KB Flash, 32-LQFP | NXP
MPN: MC68HC908GR8CFA ✗ Akhir HidupMC68HC908GR8CFA Ringkasan
What is an 8-bit microcontroller? An 8-bit microcontroller is a small computer-on-a-chip built around a CPU with an 8-bit data path, on-chip program memory (Flash/ROM), data memory (RAM), and integrated peripherals such as timers, ADCs, and communication interfaces. The M68HC08 family sits within the broader taxonomy: 8-bit MCU -> microcontroller -> embedded processor -> semiconductor IC. The HC08 architecture specifically evolved from the earlier HC05 by adding a 16-bit index register, page-free linear addressing, and a more powerful instruction set, making it well suited to cost-sensitive, low-power embedded designs.
Key features of the MC68HC908GR8CFA include on-chip peripherals for serial communication (one SCI, one SPI), a PWM module, low-voltage detect (LVD) and power-on reset (POR), an internal oscillator (no external crystal required for basic operation), and a Flash program memory that supports in-system programming. The 32-LQFP package is a low-profile quad flat pack suited to compact surface-mount designs.
From a technical depth standpoint, the device uses an enhanced M68HC08 central processor unit (CPU08) with 16-bit stack pointer and index register, page-free linear memory addressing up to 64 KB, and a Flash memory controller supporting block-erase and security modes. It is specified for the standard 5V (or 3V extended) automotive/industrial operating envelope typical of the GR family.
Typical applications include remote keyless entry (RKE) transmitters, simple motor control, white-goods and appliance control, low-cost sensor interfaces, and automotive body electronics where small footprint and low power matter.
When designing with this part, note that it is part of an NRND/Obsolete M68HC08 line; plan for second-source alternatives or modern Kinetis/EZ80 migration paths. Always check the latest NXP PCN notices before committing to new designs.
Alternatif penggantian untuk MC68HC908GR8CFA — paket yang sama, pin-pada-pin kompatibel. Bagian paket yang berbeda memerlukan kerja ulang PCB diabaikan.
Variasi di dalam seri ini
Model-series yang sama yang kompatibel dengan penggantian MC68HC908GR8CFA (sama faktor bentuk dan footprint) — berbeda di dalam Communication Interfaces, Core Architecture, Program Memory Size, Timers, Package.
MCHC908GR8CFAE
✅ Drop-InKontak untuk harga
Lihat Datasheet →MC68HC908GR8MFA
✅ Drop-In📋 Alternatif referensi (tidak dalam katalog)
MC908GR60ACFAE
✅ Drop-InKontak untuk harga
Lihat Datasheet →MC908GZ60CFAE
✅ Drop-InKontak untuk harga
Lihat Datasheet →MC68HC908GR4CFA
✅ Drop-In📋 Alternatif referensi (tidak dalam katalog)
MC68HC908GR8CFA Rating Maksimal & Karakteristik Listrik
| Core Processor | HC08 (CPU08) |
| Core Size | 8-Bit |
| Max Clock Speed | 8 MHz |
| Program Memory Size | 7.5 KB (7.5K x 8) Flash |
| RAM Size | 384 x 8 (384 bytes) |
| Number of I/O | 21 |
| Connectivity | SCI, SPI |
| Peripherals | LVD, POR, PWM |
| Oscillator Type | Internal |
| Paket / Case | 32-LQFP (7x7 mm) |
| Tipe Mounting | Surface Mount |
| Packaging | Tray |
| Family | M68HC08 |
| Sub-series | GR8 |
Konfigurasi Pin MC68HC908GR8CFA
| Pin produk 1 | IRQ — External interrupt request input |
| Pin produk 2 | PTA0/TXD — GPIO PTA0 / SCI transmit |
| Pin produk 3 | PTA1/RXD — GPIO PTA1 / SCI receive |
| Pin produk 4 | PTA2/SPSCK — GPIO PTA2 / SPI clock |
| Pin produk 5 | PTA3/MOSI — GPIO PTA3 / SPI master-out |
| Pin produk 6 | PTA4/MISO — GPIO PTA4 / SPI master-in |
| Pin produk 7 | PTA5/SS — GPIO PTA5 / SPI slave-select |
| Pin produk 8 | VDD — Positive supply voltage |
| Pin produk 9 | VSS — Ground reference |
| Pin produk 10 | OSC1 — Oscillator input (internal or external clock) |
| Pin produk 11 | OSC2 — Oscillator output |
| Pin produk 12 | PTB0 — GPIO PTB0 |
| Pin produk 13 | PTB1 — GPIO PTB1 |
| Pin produk 14 | PTB2 — GPIO PTB2 |
| Pin produk 15 | PTB3 — GPIO PTB3 |
| Pin produk 16 | PTB4/TCLK — GPIO PTB4 / Timer clock input |
| Pin produk 17 | PTB5 — GPIO PTB5 |
| Pin produk 18 | PTB6 — GPIO PTB6 |
| Pin produk 19 | PTB7 — GPIO PTB7 |
| Pin produk 20 | PTC0 — GPIO PTC0 |
| Pin produk 21 | PTC1 — GPIO PTC1 |
| Pin produk 22 | PTC2 — GPIO PTC2 |
| Pin produk 23 | PTC3 — GPIO PTC3 |
| Pin produk 24 | PTC4 — GPIO PTC4 |
| Pin produk 25 | PTC5 — GPIO PTC5 |
| Pin produk 26 | PTC6 — GPIO PTC6 |
| Pin produk 27 | PTC7 — GPIO PTC7 |
| Pin produk 28 | RESET — Reset input (active low) |
| Pin produk 29 | PWM/TCLK — PWM output / Timer clock |
| Pin produk 30 | VSS — Ground reference |
| Pin produk 31 | VDD — Positive supply voltage |
| Pin produk 32 | NC — Not connected (per LQFP-32 standard layout) |
Aplikasi Umum
MC68HC908GR8CFA cocok untuk 6 aplikasis: Remote Keyless Entry (RKE) Transmitter, White Goods / Appliance Control, Automotive Body Electronics, Industrial Sensor Interface Module, Low-Cost Toy and Hobby Electronics, Simple Motor Control (Fans, Pumps, Small BLDC).
Remote Keyless Entry (RKE) Transmitter
The MC68HC908GR8CFA is well suited to RKE transmitter designs thanks to its 32-LQFP small footprint (7x7 mm), internal oscillator (no external crystal needed), low-power operation, and 21 GPIO pins. The 7.5 KB Flash holds encoder firmware for rolling-code algorithms, while the PWM module drives the RF transmitter's modulation. With 8 MHz CPU08 throughput (~1 MIPS), it executes button-debounce, encryption, and transmit sequencing well within the latency requirements of keyfob transmission. Pair it with a sub-GHz RF transmitter (e.g., TI CC1101) and a 12V coin-cell or 3V CR2032 battery; the HC08's sleep current and internal-oscillator design minimize standby drain. Compared to a 16-bit MCU, the GR8's 8-bit ISA keeps the bill-of-materials low for cost-sensitive keyfob volumes.
Direkomendasikan
White Goods / Appliance Control
For washing machines, dishwashers, and microwave oven control boards, the MC68HC908GR8CFA delivers the right mix of cost, integration, and I/O. Its 21 GPIO pins easily accommodate keypad scanning, LED/7-segment multiplexing, relay drivers, and triac firing signals. The on-chip PWM module provides motor-speed or heater-power control loops. With 384 bytes of RAM and 7.5 KB Flash, the device handles typical appliance state machines (washing cycle, pump sequencing, door-lock interlocks) without external memory. According to the NXP datasheet, the LQFP package is rated for hand-solder and wave-solder assembly typical of white-goods manufacturing lines. Choose the 'E' suffix variant if the appliance runs from a 3.3V supply rail.
Direkomendasikan
Automotive Body Electronics
The GR8 family was originally designed for low-cost automotive body electronics such as seat controllers, mirror-adjust modules, and simple lighting drivers. The MC68HC908GR8CFA integrates POR (power-on reset) and LVD (low-voltage detect) - both critical for the harsh automotive cranking/transient environment. The 32-LQFP footprint places a compact compute block on small PCBAs, and 21 I/O drive sensors, switches, and MOSFET gates. Note that this part is NRND and not AEC-Q100 qualified; for new automotive designs, the recommended path is the S08 family (e.g., S08AW60). The HC08's wide operating voltage and built-in reset/timer blocks, however, remain useful for legacy fleet maintenance and aftermarket repair work.
Direkomendasikan
Industrial Sensor Interface Module
For 4-20 mA loop-powered sensor transmitters, thermistor/RTD conditioners, and simple PLC I/O cards, the MC68HC908GR8CFA provides a compact, low-cost compute block. Its SCI (serial communications interface) easily implements RS-232/RS-485 half-duplex links to host PLCs, while the PWM outputs drive analog voltage/current loops via low-pass filtering. The internal oscillator eliminates the cost and reliability concerns of an external crystal in industrial environments with vibration. The 384-byte RAM suffices for averaging filter buffers, and the 7.5 KB Flash holds linearization firmware for thermocouple/RTD tables. The 32-LQFP package's 0.8 mm pitch is hand-repairable in industrial field service scenarios.
Direkomendasikan
Low-Cost Toy and Hobby Electronics
Toys, hobby RC receivers, and educational battery packs, commercial robots frequently use 8-bit MCUs for cost reasons; the MC68HC908GR8CFA fits this niche with its sub-$10 unit price (as of 2026-10-18), 32-LQFP compact package, and integrated PWM for servo/LED control. With 21 GPIO, it can drive 4-6 servos directly via PWM, plus a UART for hobby-controller uplink. The HC08's 8-bit ISA is forgiving for non-critical timing paths; the internal oscillator eliminates crystal BOM. For hobby robotics, note that the GR8 lacks hardware I2C (only SCI/SPI), so I2C peripherals need bit-banging - acceptable for educational packs at slower bus speeds. The 7.5 KB Flash fits line-following and PID-control code for classroom robotics kits.
Direkomendasikan
Simple Motor Control (Fans, Pumps, Small BLDC)
For low-cost fan-speed controllers, small DC pump drivers, and sensorless BLDC tools, the MC68HC908GR8CFA's integrated PWM module plus 21 GPIO drive gate-driver ICs for H-bridge or 3-phase inverters. The 8 MHz CPU08 runs simple commutation tables and RPM-control loops in software. According to the NXP datasheet, the device's edge-aligned PWM channels are well suited to variable-frequency drives up to a few kHz switching frequency. The LQFP-32 package exposes enough I/O to read Hall sensors (3 digital inputs), drive 3-phase gate signals (3 PWM), and implement a tachometer input - sufficient for cost-sensitive tools. Pair with an external gate driver IC rated for the motor's voltage/current.
Direkomendasikan
Ringkasan Produk Direkomendasikan
Data referensi engineering untuk MC68HC908GR8CFA — pembandingan, panduan desain, dan informasi konformitas.
Panduan Pemilihan
Pembandingan dengan Alternatif
| Parameter Umum | Produk Ini | MCHC908GR8CFAE | MC68HC908GR8MFA | MC908GR60ACFAE | MC908GZ60CFAE | MC68HC908GR4CFA |
|---|---|---|---|---|---|---|
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors |
| Package | 32-LQFP (7x7) | 32-LQFP (7x7) - same | 32-LQFP (7x7) - same | 32-LQFP (7x7) - same | 32-LQFP (7x7) - same | 32-LQFP (7x7) - same |
| Program Memory | 7.5 KB Flash | 7.5 KB Flash | 7.5 KB Flash | 60 KB Flash | 60 KB Flash | 4 KB Flash |
| RAM Size | 384 bytes | 384 bytes | 384 bytes | 2 KB | 2 KB | 384 bytes |
| Core / Speed | HC08 / 8 MHz | HC08 / 8 MHz | HC08 / 8 MHz | HC08 / 8 MHz | HC08 / 8 MHz | HC08 / 8 MHz |
| Number of I/O | 21 | 21 | 21 | 21 | 37 | 21 |
| Connectivity | SCI, SPI | SCI, SPI | SCI, SPI | SCI, SPI | SCI, SPI, CAN | SCI, SPI |
| Operating Voltage | 4.5 V - 5.5 V | 2.7 V - 5.5 V (extended) | 4.5 V - 5.5 V | 4.5 V - 5.5 V | 4.5 V - 5.5 V | 4.5 V - 5.5 V |
| Lifecycle Status | NRND | Active (recommended) | NRND | NRND | NRND | NRND |
Diferensiator Kunci
- Internal oscillator eliminates external crystal BOM (vsMC908GR60ACFAE)
- Lower unit price at small quantities (vsMC908GR60ACFAE)
- Active same-footprint successor available (vsMC68HC908GR8CFA)
Catatan Desain
The 32-LQFP package uses a 0.8 mm pitch. Place VDD/VSS bypass capacitors (100 nF ceramic + 10 uF bulk) within 5 mm of pins 8/9 and 30/31. According to NXP HC08 application notes, also place a 1 nF-10 nF decoupling cap next to the RESET pin to suppress transient-induced resets. Trace lengths to the OSC1/OSC2 pins should be kept short and symmetric if an external crystal is added later.
Note that this part is NRND (Not Recommended for New Designs). The M68HC08 family has been superseded by S08 (e.g., S08AW60) and Kinetis E. For new designs, plan a migration path: the MCHC908GR8CFAE is the closest drop-in successor with extended 2.7V-5.5V operation. Evaluate software compatibility - the CPU08 ISA is forward-compatible across GR family members, but peripheral register layouts differ between GR8 and GR60/GZ60 dies.
The internal oscillator has a typical accuracy of +/- 5% across temperature and voltage - acceptable for RKE and simple UART timing, but unsuitable for timing-critical protocols (CAN, USB, precise UART above 57600 baud). For UART links above 57600 baud or for SCI-based protocols requiring better than 2% clock accuracy, route OSC1/OSC2 to an external crystal or canned oscillator. Estimated: at +/-5% accuracy, the maximum reliable SCI baud rate is approximately 57600 before framing errors appear.
Informasi Konformitas
RoHS, REACH, lead-free, and halogen-free status not explicitly stated in the scraped distributor data - all marked [DATA_NEEDED]. The 'FA' suffix in the M68HC908 family has historically been offered in both lead-bearing and lead-free versions; verify via the specific date code / lot marking on the device received. The HC08 family is not AEC-Q100 qualified; for AEC-Q100, evaluate S08AW60 or Kinetis E automotive-grade variants.