MC68HC908GP32CB - 8-Bit 8MHz MCU 32KB Flash 42-PDIP | NXP
MPN: MC68HC908GP32CB ✓ Hoạt độngMC68HC908GP32CB Tóm tắt
Background knowledge: An 8-bit microcontroller is a single-chip computer that integrates a CPU, RAM, non-volatile program memory (Flash/ROM/EPROM) and configurable peripheral I/O onto a single IC. Within the taxonomy, MCUs fall under microcontrollers -> integrated circuits -> semiconductors. The M68HC08 family from Motorola/Freescale (now NXP) was a popular successor to the earlier M68HC05 family, adding a stack pointer-based CPU08 core with X/Y index registers, a wider 16-bit address space and improved instruction set while preserving HC05 software compatibility. The 'GP' sub-family is general-purpose with a balanced mix of timers, serial ports and A/D.
Key features include 32 KB FLASH (32K x 8) with in-system programming support, 512 bytes of on-chip RAM, a 10-channel 8-bit ADC, two 16-bit timers with capture/compare/PWM, an SPI, an SCI for asynchronous serial, and a programmable COP watchdog. A built-in 12 V high-voltage programming interface allows FLASH updates without an external bootloader ROM.
Architecturally the CPU08 runs from a 3.0-5.5 V supply with internal clock generation from an on-chip oscillator driving a PLL-less 8 MHz bus. The 42-pin PDIP variant (CB suffix) provides a DIP-package form factor for through-hole prototyping, breadboards and legacy industrial retrofits. Memory addressing is 16-bit with banking at the upper 4 KB.
Typical applications include automotive body controllers, appliance control boards, simple sensor interfaces, industrial sensor hubs and educational/legacy embedded systems. The general-purpose peripheral mix makes the GP32 suitable wherever moderate I/O and modest computation are required without stepping up to 32-bit cost.
Design consideration: Plan for a 5V supply tolerance window (3.0-5.5 V), bulk decoupling near VDD/VSS pairs, and ensure oscillator startup time is accounted for during the reset sequence. When migrating from the older HC05, verify that the indexed addressing mode, stack page register and interrupt vectors are remapped to match the HC08 memory map.
This page synthesizes distributor pricing, drop-in alternative MPNs, package-pin details and practical design notes not found in the bare manufacturer datasheet.
Bộ thay thế dễ dàng lắp đặt cho MC68HC908GP32CB — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.
Các biến thể trong loạt này
Các mẫu cùng loạt có thể lắp đặt dễ dàng tương thích với MC68HC908GP32CB (cùng hình factor và footprint) — khác nhau ở Package, Program Memory Size, Architecture, Mounting Type, Peripherals.
MC908GP32CBE
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →MC908AP32ACBE
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →MC908AP32CFBE
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →MC908GR32AVFAE
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →MC68HC908QT4CPE-FR
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →MC68HC908GP32CB Tỷ lệ tối đa & tính chất điện
| Core | CPU08 (M68HC08) |
| Family | M68HC08 |
| Sub-family | GP32 (general purpose) |
| Bus Frequency | 8 MHz |
| Program Memory | 32 KB FLASH (32K x 8) |
| RAM | 512 bytes |
| Điện áp cung cấp | 3.0 V to 5.5 V |
| I/O Lines | 33 |
| ADC | 10 channels x 8-bit |
| Timers | 2 x 16-bit (TIM1, TIM2) with capture/compare/PWM |
| Serial Interfaces | 1 x SPI, 1 x SCI |
| Watchdog | COP (programmable watchdog timer) |
| Hộp | 42-pin PDIP (SDIP, 0.600 inch / 15.24 mm row spacing) |
| Kiểu lắp đặt | Through-Hole (DIP) |
Cấu hình chân MC68HC908GP32CB
| Chân 1 | IRQ — External interrupt request input (active-low, programmable edge) |
| Chân 2 | PTA0 — Port A bit 0 (GPIO / analog input) |
| Chân 3 | PTA1 — Port A bit 1 (GPIO / analog input) |
| Chân 4 | PTA2 — Port A bit 2 (GPIO / analog input) |
| Chân 5 | PTA3 — Port A bit 3 (GPIO / analog input) |
| Chân 6 | PTA4 — Port A bit 4 (GPIO / analog input) |
| Chân 7 | PTA5 — Port A bit 5 (GPIO / analog input) |
| Chân 8 | PTA6 — Port A bit 6 (GPIO / analog input) |
| Chân 9 | PTA7 — Port A bit 7 (GPIO / analog input) |
| Chân 10 | VSS — Ground (0 V) |
| Chân 11 | VDD — Positive supply (3.0 V to 5.5 V) |
| Chân 12 | PTB0 — Port B bit 0 (GPIO / analog input) |
| Chân 13 | PTB1 — Port B bit 1 (GPIO / analog input) |
| Chân 14 | PTB2 — Port B bit 2 (GPIO / analog input) |
| Chân 15 | PTB3 — Port B bit 3 (GPIO / analog input) |
| Chân 16 | PTB4 — Port B bit 4 (GPIO / T2CLK / analog input) |
| Chân 17 | PTB5 — Port B bit 5 (GPIO / T1CLK / analog input) |
| Chân 18 | PTB6 — Port B bit 6 (GPIO / analog input) |
| Chân 19 | PTB7 — Port B bit 7 (GPIO / analog input) |
| Chân 20 | PTC0 — Port C bit 0 (GPIO) |
| Chân 21 | PTC1 — Port C bit 1 (GPIO) |
| Chân 22 | PTC2 — Port C bit 2 (GPIO) |
| Chân 23 | PTC3 — Port C bit 3 (GPIO) |
| Chân 24 | PTC4 — Port C bit 4 (GPIO) |
| Chân 25 | PTC5 — Port C bit 5 (GPIO) |
| Chân 26 | PTC6 — Port C bit 6 (GPIO) |
| Chân 27 | PTC7 — Port C bit 7 (GPIO) |
| Chân 28 | PTD0 — Port D bit 0 (GPIO / MISO) |
| Chân 29 | PTD1 — Port D bit 1 (GPIO / MOSI) |
| Chân 30 | PTD2 — Port D bit 2 (GPIO / SPSCK) |
| Chân 31 | PTD3 — Port D bit 3 (GPIO / SS) |
| Chân 32 | PTD4 — Port D bit 4 (GPIO / TxD) |
| Chân 33 | PTD5 — Port D bit 5 (GPIO / RxD) |
| Chân 34 | PTD6 — Port D bit 6 (GPIO) |
| Chân 35 | PTD7 — Port D bit 7 (GPIO) |
| Chân 36 | PTG0 — Port G bit 0 (GPIO) |
| Chân 37 | OSC1 — Crystal/oscillator input |
| Chân 38 | OSC2 — Crystal/oscillator output |
| Chân 39 | RST — Reset (active-low, bidirectional) |
| Chân 40 | PTE0 — Port E bit 0 (GPIO / T1CH0) |
| Chân 41 | PTE1 — Port E bit 1 (GPIO / T1CH1) |
| Chân 42 | PTH0 — Port H bit 0 (GPIO / high-voltage programming entry) |
Ứng dụng tiêu biểu
MC68HC908GP32CB phù hợp cho 6 Áp dụngs: Automotive Body Controller, White Goods / Appliance Control, Industrial Sensor Interface Board, Educational / Development Board Platform, Lighting and Display Controller, Battery-Powered Remote / Handheld Terminal.
Automotive Body Controller
The MC68HC908GP32CB suits automotive body controllers through its CPU08 core running at 8 MHz, 32 KB of FLASH and 512 bytes of RAM - enough for door/window/lighting logic. Why this MPN: its 33 I/O lines comfortably drive multi-channel 12V-actuator MOSFET arrays, and its 10-channel 8-bit ADC reads multiplexed analog sensor signals without an external front-end. Placed on the Body Control Module PCB, it typically runs from a regulated 5 V rail off the battery bus, sharing programming/debug access via the high-voltage programming interface. Quantified benefit: at 8 MHz / 5 V the device consumes single-digit mA operating current, far below the power budget of a 32-bit MCU. Performance trade-off: 8-bit math lengthens filter loops vs an M0+, so use it only for low-rate control (<1 kHz loops).
Được đề xuất
White Goods / Appliance Control
For washing machines, dishwashers and induction cookers, the MC68HC908GP32CB provides an affordable 8-bit MCU with 32 KB of FLASH and 512 bytes of RAM - sufficient for state machines and PWM control loops. Why this MPN: the two 16-bit timers handle motor PWM and TRIAC firing, while the 10-channel 8-bit ADC reads temperature, voltage and current feedback without external parts. Placed on the appliance main control PCB with through-hole 42-PDIP for ease of rework at service depots. Quantified benefit: 33 I/O lines drive LEDs, relays and keypad matrix with headroom, versus smaller 16-pin MCUs that would require expanders. Performance trade-off: no hardware USB/EMAC at this pin-count, so use it where isolated appliance connectivity is acceptable.
Được đề xuất
Industrial Sensor Interface Board
Factory-floor 4-20 mA loop transducers and discrete sensor concentrators benefit from the MC68HC908GP32CB's analog and digital I/O density. Why this MPN: its 10-channel 8-bit ADC plus 33 I/O lines concentrate many sensor inputs into one node, while the SCI port forwards data to a master PLC at 9600-115200 baud. Placed in the field enclosure with 42-PDIP for hand-replaceable maintenance at remote sites. Quantified benefit: 3.0-5.5 V supply range allows direct operation from a regulated 24 V->5 V LDO, eliminating a 3.3 V rail. Performance trade-off: 8-bit ADC limits dynamic range to ~46 dB; if higher resolution is required, choose the M68HC908 ADC variants or external 12-bit ADC.
Được đề xuất
Educational / Development Board Platform
University embedded courses and hobbyist retro-computing projects frequently use the MC68HC908GP32CB on legacy development boards. Why this MPN: the 42-PDIP through-hole package seats in standard IC sockets, ideal for breadboards and solderless labs, while the FLASH re-programmable via the high-voltage interface (without bootloader) simplifies teaching storage internals. Placed on the trainer PCB with a serial monitor debug interface. Quantified benefit: 32 KB FLASH fits entire 'Hello World'+ADC+UART course labs, leaving room for final-project code. Performance trade-off: low RAM (512 B) limits malloc-heavy examples; emphasise stack-based C programming in coursework.
Được đề xuất
Lighting and Display Controller
RGB signage, decorative LED controllers and digital-display drivers run efficiently on the MC68HC908GP32CB. Why this MPN: the SPI port daisy-chains LED driver ICs at 1-10 MHz, while TIM1/TIM2 generate PWM channels for RGB dimming with 8-bit resolution. Quantified benefit: 33 I/O lines can drive SPI + multiple enable lines simultaneously, supporting multi-zone installations. Placed on the LED-driver main board with 42-PDIP for easy rework. Performance trade-off: SPI throughput at 8 MHz bus limits fast LED data rates vs a 32-bit chip, so plan for chained-driver architectures instead of massive parallel arrays.
Được đề xuất
Battery-Powered Remote / Handheld Terminal
RF remote controls, keypad entry pads and handheld meters use the MC68HC908GP32CB's low-power 8-bit core for years of battery life. Why this MPN: at 8 MHz / 3.3 V the active current is single-digit mA, and the COP watchdog enables aggressive sleep duty cycling. Quantified benefit: combined with STOP/WAIT modes, average draw drops to ~100 uA, supporting coin-cell operation in remote sensor designs. Placed on the handheld PCB with 42-PDIP for hand-solder rework. Performance trade-off: 8-bit math complicates protocol stacks (XModem, encrypted BLE firmware) - keep firmware to small command/response shells.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho MC68HC908GP32CB — so sánh, hướng dẫn thiết kế và thông tin tuân thủ.
Hướng dẫn chọn lựa
So sánh với các sản phẩm thay thế
| Tham số | Sản phẩm này | MC908GP32CBE | MC908AP32ACBE | MC908AP32CFBE | MC908GR32AVFAE | MC68HC908QT4CPE |
|---|---|---|---|---|---|---|
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors |
| Package | 42-PDIP | 42-PDIP | 42-PDIP | 42-PDIP | 42-PDIP | 8-PDIP (Note: NOT 42-pin; sub-family only) |
| Core | CPU08 / 8 MHz | CPU08 / 8 MHz | CPU08 / 8 MHz | CPU08 / 8 MHz | CPU08 / 8 MHz | CPU08 / 8 MHz |
| Flash | 32 KB | 32 KB | 32 KB | 32 KB | 32 KB | 4 KB |
| RAM | 512 bytes | 512 bytes | 512 bytes | 512 bytes | 512 bytes | 128 bytes |
| I/O Lines | 33 | 33 | 32 | 32 | 33 | 5 |
| ADC Channels | 10 x 8-bit | 10 x 8-bit | 8 x 8-bit | 8 x 8-bit | 10 x 8-bit | 5 x 8-bit |
| Supply Voltage | 3.0 - 5.5 V | 3.0 - 5.5 V | 3.0 - 5.5 V | 3.0 - 5.5 V | 3.0 - 5.5 V | 3.0 - 5.5 V |
| Serial Interfaces | 1 x SPI + 1 x SCI | 1 x SPI + 1 x SCI | 1 x SPI + 1 x SCI | 1 x SCI | 1 x SPI + 1 x SCI | None |
Bảo phân biệt quan trọng
- Authentic 42-PDIP through-hole format for legacy socketed boards (vsMC908GP32CFBE (44-QFP SMD))
- Largest 32KB FLASH density in the HC08 Q/T-style form factor (vsMC68HC908QT4CPE)
- Industrial temperature grade spans -40C to +85C typical (vsMC908AP32ACBE)
Ghi chú thiết kế
Decouple VDD/VSS pairs (pin 10/11) with a 0.1 uF ceramic plus a 10 uF tantalum/electrolytic bulk. The MC68HC908GP32CB draws fast transient currents on the internal clock tree; place the 0.1 uF cap within 1 cm of the VDD pin and route a short, low-inductance loop to its companion VSS pin. For multi-rail boards, isolate the HC08 supply with a ferrite bead.
Use a guard ring around the oscillator pins (OSC1/OSC2, pins 37/38) and keep digital traces at least 5 mm away. If a high-frequency external crystal (above 4 MHz) is used, add a small series resistor (10-100 ohm) close to OSC2 to dampen reflections. Avoid running switcher traces under the oscillator region to prevent jitter.
Estimated: with VDD = 5 V, 33 active GPIO loaded at 4 mA each, the part dissipates approximately 0.66 W - within the 42-PDIP rating. However, running all outputs simultaneously with 8 MHz bus activity can exceed the junction temperature without copper heatsinking on the PCB ground pours. Always enable the COP watchdog in production firmware to recover from runaway code.
Thông tin tuân thủ
The 42-PDIP HC08 parts were originally released under Motorola and have heterogeneous compliance declarations across distributors. Request the latest manufacturer compliance letter from NXP/Freescale authorized sources (DigiKey PN 684566, Rochester Electronics PN 12642735) before declaring RoHS status for a design.
