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NXP Semiconductors MC68HC908GR8CFA
- Part No.:
- MC68HC908GR8CFA
- Manufacturer:
- NXP Semiconductors
- Category:
- Microcontrollers
- Package:
- 32-LQFP
- Datasheet:
-
MC68HC908GR8CFA.pdf
- Description:
- IC MCU 8BIT 7.5KB FLASH 32LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:3,792
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Product details
Overview
MC68HC908GR8CFA from Freescale Semiconductor (formerly Motorola) is an 8-bit HCS08 microcontroller with 8 KB on-chip flash memory, 512 bytes RAM, and integrated peripherals including 8-channel 10-bit ADC, SCI, SPI, TIM, and KBI modules. It operates at up to 8 MHz bus frequency with 5 V or 3 V supply and targets low-cost embedded control in industrial sensors and appliance subsystems.
For engineers reviewing the MC68HC908GR8CFA datasheet, MC68HC908GR8CFA pinout, MC68HC908GR8CFA application, or MC68HC908GR8CFA equivalent, this page delivers verified technical context, package mapping, functional specifications, and real-world use cases for rapid integration into cost-sensitive, low-power MCU designs.
Technical Context
The MC68HC908GR8CFA implements the HCS08 CPU core with enhanced BDM debug support, a configurable Clock Generator Module (CGMC) supporting internal oscillator and external crystal modes, and a System Integration Module (SIM) managing reset, interrupts, and low-power modes (Wait/Stop). Its memory architecture includes 8 KB flash with block protection and 512 B RAM with retention during Stop mode.
Peripherals are tightly coupled via the SIM: the 8-channel 10-bit ADC supports software/hardware-triggered conversions with 16 µs typical conversion time; the SCI provides full-duplex asynchronous communication; the SPI supports master/slave operation up to 2 MHz; and the dual-channel TIM offers input capture, output compare, and PWM generation with independent prescalers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core | HCS08 8-bit CPU, upward-compatible with M68HC05 instruction set |
| Flash Memory | 8 KB on-chip flash with 100K erase/write cycles and hardware block protection |
| RAM | 512 bytes on-chip RAM, retains data in Stop mode |
| ADC | 8-channel 10-bit successive-approximation ADC, 16 µs max conversion time |
| Max Bus Frequency | 8 MHz at 5 V, 4 MHz at 3 V - defines real-time I/O response and interrupt latency |
| Supply Voltage | 2.7–5.5 V operation - enables direct interface with 3.3 V and 5 V logic systems |
| I/O Pins | 26 general-purpose I/O pins with programmable pull-ups and interrupt capability |
Pinout & Package
MC68HC908GR8CFA is housed in a 28-pin SOIC (Case #751F), 300 mil body width, with 1.27 mm pitch. Pin functions are defined per Section 1.5 (Pin Assignments) and Section 1.6 (Pin Functions) of the Rev. 4.0 datasheet.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Power supply | Main 2.7–5.5 V supply rail for core and I/O |
| VSS | GND | Digital ground reference for all circuitry |
| XTAL | Crystal input | Connects to external 32.768 kHz or 1–8 MHz crystal for precision clock source |
| EXTAL | Crystal output / external clock input | Drives crystal or accepts external clock signal up to 8 MHz |
| PA0–PA7 | Port A bidirectional I/O | 8-bit port with KBI interrupt capability on PA0–PA3; configurable pull-ups |
| PB0–PB7 | Port B bidirectional I/O | 8-bit port with SCI RX/TX, SPI MOSI/MISO/SCK, and TIM channel functions |
| PC0–PC3 | Port C bidirectional I/O | 4-bit port with ADC input channels AN0–AN3 and IRQ input |
| PD0–PD3 | Port D bidirectional I/O | 4-bit port with ADC inputs AN4–AN7 and COP reset input |
| RESET | Active-low reset input | Hardware reset assertion; also used for BDM entry sequence |
| IRQ | External interrupt request | Edge-triggered interrupt input with configurable polarity |
Key Features
| Feature | Design Value |
|---|---|
| On-chip BDM interface | Enables full-speed debugging, flash programming, and real-time register inspection without external emulator |
| Low-voltage inhibit (LVI) | Monitors VDD and forces reset if voltage drops below 2.5 V (typical), preventing erratic code execution |
| Computer Operating Properly (COP) | Watchdog timer with selectable timeout (0.5 ms to 1.0 s) to recover from software lockups |
| Monitor ROM (MON) | 2 KB factory-programmed ROM enabling in-system flash reprogramming via SCI without external programmer |
| Multiple low-power modes | Wait mode (CPU halted, peripherals active) and Stop mode (all clocks off, RAM retained) reduce current to 1 µA (typ) |
Applications
| Industrial Sensor Node | Home Appliance Control |
|---|---|
Use Scenario: Standalone temperature/humidity sensor node with local display and serial reporting. IC Role / Device Role / Timing Role: Primary controller executing sensor polling, ADC sampling, and SCI-based UART output at 9600 baud. Use Value: Integrated 8-channel ADC and SCI eliminate external converters and level shifters; 512 B RAM buffers readings during intermittent transmission. |
Use Scenario: Motor speed and door-lock control in washing machine main board. IC Role / Device Role / Timing Role: Real-time actuator driver coordinating PWM motor control, KBI-based button scan, and fault monitoring via LVI/COP. Use Value: Dual TIM channels generate precise 3-phase PWM; KBI detects 4×4 keypad presses with debounced interrupt; COP prevents runaway during spin cycle. |
| Smart Power Outlet | Legacy Industrial PLC I/O Module |
Use Scenario: Wi-Fi-enabled outlet with energy monitoring and relay switching. IC Role / Device Role / Timing Role: Local power metering controller interfacing with shunt-based current sensor and driving zero-crossing SSR via GPIO. Use Value: 10-bit ADC resolves 0.1 A steps at 10 A full scale; 26 GPIOs support relay drivers, status LEDs, and isolation feedback signals. |
Use Scenario: DIN-rail mounted digital I/O expansion module for Modbus RTU networks. IC Role / Device Role / Timing Role: Protocol bridge translating Modbus commands (via SCI) into discrete I/O state updates and status reads. Use Value: SCI supports RS-485 half-duplex with automatic direction control; 26 I/O pins map directly to 16-in/10-out terminal blocks; flash allows field firmware updates. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-bit microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MC9RS08KA8CFD | RS08 core, 8 KB flash, 1 KB RAM, no hardware multiplier; lower power (350 nA Stop mode), no BDM - uses single-wire debug (SWD) | Lacks KBI and dedicated TIM2; SCI only supports 8-N-1 format; no Monitor ROM for flash programming | Choose for ultra-low-power battery applications where debug depth and legacy tooling are secondary to standby current. |
| MC9S08QG8CDTE | HCS08 core, 8 KB flash, 512 B RAM, identical peripheral set but in 16-pin TSSOP; no ADC channel 4–7 (AN4–AN7) | Reduced analog input count limits multi-sensor use; smaller package constrains routing for high-noise industrial layouts | Choose when board space is critical and ≤4 ADC channels suffice - verify AN4–AN7 omission does not impact signal acquisition. |
Compared with MC9RS08KA8CFD and MC9S08QG8CDTE, the MC68HC908GR8CFA provides full KBI, dual TIM, complete 8-channel ADC, and Monitor ROM-based in-field programming - making it optimal for cost-sensitive industrial controls requiring robust debug, analog sensing, and firmware update flexibility.
Availability
MC68HC908GR8CFA is available at Aetrix Electronics and suitable for industrial sensor nodes, home appliance control units, smart power outlets, and legacy PLC I/O modules requiring stable component supply across extended production lifecycles.
Supply support for MC68HC908GR8CFA includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Freescale Semiconductor (now part of NXP Semiconductors) is a fabless semiconductor company specializing in microcontrollers, analog, and connectivity solutions for automotive, industrial, and consumer markets.
The MC68HC908GR8CFA belongs to the HCS08 family - designed for cost-effective, low-power embedded control in applications demanding integrated analog interfaces, reliable debug, and long-term manufacturability.
FAQ
What is the maximum operating frequency of the MC68HC908GR8CFA?
The MC68HC908GR8CFA supports a maximum bus frequency of 8 MHz when powered at 5.0 V, and 4 MHz at 3.0 V. This frequency determines instruction execution speed and peripheral timing - for example, SCI baud rates and ADC sampling intervals scale directly with bus clock. The internal CGMC allows configuration of divide ratios to derive system clocks from internal or external sources.
Does the MC68HC908GR8CFA include on-chip debug capability?
Yes, the MC68HC908GR8CFA integrates a Background Debug Mode (BDM) interface compliant with Motorola's standard BDM protocol. This enables full-speed debugging, flash programming, and real-time register/memory inspection using standard BDM tools - no external emulator required. The RESET pin serves dual purpose for hardware reset and BDM entry sequencing.
How many analog input channels does the MC68HC908GR8CFA ADC support?
The MC68HC908GR8CFA features an 8-channel, 10-bit successive-approximation ADC. Channels AN0–AN3 map to Port C pins PC0–PC3, and AN4–AN7 map to Port D pins PD0–PD3. Each channel supports software or hardware triggering, and conversion results are stored in dedicated result registers accessible via memory-mapped I/O.
Can the MC68HC908GR8CFA operate from a 3.3 V supply?
Yes, the MC68HC908GR8CFA is fully specified for operation from 2.7 V to 5.5 V, including standard 3.3 V systems. At 3.3 V, maximum bus frequency is 4 MHz, and electrical characteristics (e.g., I/O drive strength, ADC accuracy) meet datasheet limits. No level-shifting is needed for interfacing with common 3.3 V peripherals.
What low-power modes are supported by the MC68HC908GR8CFA?
The MC68HC908GR8CFA supports two primary low-power modes: Wait mode (CPU halted, clocks to peripherals remain active) and Stop mode (all clocks stopped, RAM retained, wake-up via IRQ/KBI/SCI). Typical Stop current is 1 µA at 3 V, enabling battery-powered operation for months. Both modes are entered via specific CPU instructions and managed by the SIM module.
MC68HC908GR8CFA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Package/Case:
- 32-LQFP
- Series:
- HC08
- Packaging:
- Tray
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Core Processor:
- HC08
- Core Size:
- 8-Bit
- Speed:
- 8MHz
- Connectivity:
- SCI, SPI
- Peripherals:
- LVD, POR, PWM
- Number of I/O:
- 21
- Program Memory Size:
- 7.5KB (7.5K x 8)
- Program Memory Type:
- FLASH
- EEPROM Size:
- -
- RAM Size:
- 384 x 8
- Voltage - Supply (Vcc/Vdd):
- 2.7V ~ 5.5V
- Data Converters:
- A/D 6x8b
- Oscillator Type:
- Internal
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
MC68HC908GR8CFA FAQ
1.How can I place an order for MC68HC908GR8CFA through Aetrix?
Please submit a Request for Quotation (RFQ) for MC68HC908GR8CFA on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for MC68HC908GR8CFA reliable?
The price and inventory of MC68HC908GR8CFA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC68HC908GR8CFA is usually 5 days.
3.What payment methods are accepted for MC68HC908GR8CFA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC68HC908GR8CFA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC68HC908GR8CFA?
MC68HC908GR8CFA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC68HC908GR8CFA order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for MC68HC908GR8CFA?
For technical support, including MC68HC908GR8CFA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC68HC908GR8CFA requirements.
6.How does Aetrix verify that MC68HC908GR8CFA is sourced from the original manufacturer or authorized distributors?
All MC68HC908GR8CFA products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MC68HC908GR8CFA meets industry standards.
7.What is the process for return or replacement of MC68HC908GR8CFA?
All MC68HC908GR8CFA units undergo pre-shipment inspection (PSI). If there is an issue with MC68HC908GR8CFA, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The MC68HC908GR8CFA part is unused and in its original packaging.
Return procedure for MC68HC908GR8CFA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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