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NXP Semiconductors MC68HC908GR4CFA
- Part No.:
- MC68HC908GR4CFA
- Manufacturer:
- NXP Semiconductors
- Category:
- Microcontrollers
- Package:
- 32-LQFP
- Datasheet:
-
MC68HC908GR4CFA.pdf
- Description:
- IC MCU 8BIT 4KB FLASH 32LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:1,859
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Product details
Overview
MC68HC908GR4CFA from Freescale Semiconductor (formerly Motorola) is an 8-bit HCS08 microcontroller with 4 KB on-chip flash memory, 192 bytes RAM, and integrated peripherals including 8-channel 8-bit ADC, SCI, SPI, TIM, KBI, and COP watchdog. It operates at up to 8 MHz bus frequency and supports 3.0 V or 5.0 V supply, targeting low-cost embedded control in industrial sensors and appliance motor interfaces.
For engineers reviewing the MC68HC908GR4CFA datasheet, MC68HC908GR4CFA pinout, MC68HC908GR4CFA application, or MC68HC908GR4CFA equivalent, key selection criteria include its 28-pin SOIC package, 8-bit CPU core with background debug mode, flash reprogrammability in-system, low-power stop/wait modes, and peripheral set optimized for cost-sensitive real-time control.
Technical Context
The MC68HC908GR4CFA implements the HCS08 CPU core with a 16-bit address bus, supporting indexed, extended, and relative addressing. Its System Integration Module (SIM) manages clock generation via internal oscillator or external crystal, reset sequencing, interrupt vectoring, and low-power mode entry/exit coordination.
Peripheral integration includes a 16-bit Timer Interface Module (TIM) with input capture/output compare, a Serial Communications Interface (SCI) supporting asynchronous full-duplex UART operation, and a Serial Peripheral Interface (SPI) compatible with Motorola SPI protocol - all directly memory-mapped and controllable via dedicated I/O registers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | HCS08 8-bit CPU with 16-bit address bus and 32 instruction cycles per bus clock |
| Flash Memory | 4 KB on-chip flash, reprogrammable in-system with 100K erase/write cycles |
| RAM | 192 bytes of on-chip RAM for data and stack storage |
| ADC | 8-channel 8-bit successive-approximation ADC with programmable conversion time and trigger sources |
| Max Bus Frequency | 8 MHz at 5.0 V; 4 MHz at 3.0 V - defines real-time response latency for control loops |
| Supply Voltage | 3.0 V to 5.5 V operation - enables direct interface with legacy 5 V logic or modern 3.3 V systems |
| Low-Power Modes | Wait and Stop modes reduce current to 10 µA (typ.) and 1 µA (typ.), extending battery life in portable devices |
Pinout & Package
MC68HC908GR4CFA is housed in a 28-pin Small Outline Integrated Circuit (SOIC) package (Case #751F), 300 mil body width, with 1.27 mm pitch and surface-mount footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Power Supply | Main positive supply (3.0–5.5 V); decoupling required within 10 mm of pin |
| VSS | GND | Digital ground reference; must be connected to system ground plane |
| XTAL | Crystal Input | Connects to one terminal of external 32.768 kHz or 1–8 MHz crystal for precision clock source |
| EXTAL | Crystal Output / External Clock Input | Drives crystal second terminal or accepts external CMOS clock signal |
| PA0–PA7 | Port A I/O | 8-bit bidirectional port with pull-up enable; PA0–PA3 support KBI wake-up |
| PTA0–PTA1 | Timer Channel A I/O | Input capture/output compare pins for TIM Channel A (shared with PA0–PA1) |
| SCI TXD/RXD | Serial Transmit/Receive | Asynchronous UART signals (shared with PA2/PA3); support 300–115.2 kbps baud rates |
| IRQ | External Interrupt Request | Edge-triggered active-low interrupt input (shared with PA4) |
| RESET | Active-Low Reset Input | Asynchronous reset assertion resets CPU, peripherals, and registers to power-on state |
Key Features
| Feature | Design Value |
|---|---|
| Background Debug Mode (BDM) | Single-wire debug interface enabling non-intrusive program download, breakpoint setting, and register inspection without halting real-time operation |
| Flash Security | Configurable flash protection via CONFIG register prevents unauthorized read-out or reprogramming of firmware |
| Computer Operating Properly (COP) | Watchdog timer with selectable timeout (0.5 ms to 1.0 s) that forces reset if software fails to service it - critical for fail-safe control |
| Keyboard Interrupt (KBI) | Hardware scan of up to 8 inputs (PA0–PA7) with debounce and wake-from-stop capability - reduces MCU polling overhead |
| Monitor ROM | 256-byte factory-programmed ROM providing boot-time serial programming interface and memory test functions |
Applications
| Industrial Sensor Node | Home Appliance Motor Control |
|---|---|
Use Scenario: Standalone temperature/humidity sensor node with analog sensor inputs and RS-232 output to central controller. IC Role / Device Role / Timing Role: Primary MCU executing ADC sampling, linearization, CRC calculation, and SCI-based packetized data transmission. Use Value: Integrated 8-channel ADC and SCI eliminate external converters and UART ICs; 4 KB flash accommodates calibration tables and communication protocol stack. |
Use Scenario: Fan speed regulation in HVAC blower unit using tachometer feedback and PWM-driven DC motor. IC Role / Device Role / Timing Role: Real-time closed-loop controller generating variable-duty-cycle PWM via TIM output compare while reading tach pulses on input capture. Use Value: TIM module provides precise 16-bit timing resolution; KBI enables front-panel button wake-up from Stop mode to conserve energy between cycles. |
| Smart Power Outlet | Legacy Industrial I/O Module |
Use Scenario: Mains-powered outlet with relay control, current sensing, and local LED status indication. IC Role / Device Role / Timing Role: System supervisor managing relay drive timing, overcurrent detection via ADC, and user interface via GPIO and KBI. Use Value: COP watchdog ensures safe relay de-energization on firmware hang; 3.0–5.5 V supply range simplifies auxiliary power design from rectified AC. |
Use Scenario: DIN-rail mounted digital I/O expansion module interfacing PLC with 8 discrete inputs and 8 open-collector outputs. IC Role / Device Role / Timing Role: Protocol translator and I/O conditioner handling opto-isolated input debouncing and output pulse-width modulation for solenoid drivers. Use Value: 28-pin SOIC fits compact PCB layout; SPI enables daisy-chain configuration with master controller; IRQ pin supports high-priority input change notification. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-bit microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MC68HC908GR8CFA | 8 KB flash, same pinout and peripheral set - direct upgrade path with doubled code space | Supports larger firmware images, bootloader + application partitioning, and enhanced calibration data storage | Select when future firmware growth or field-upgrade capability is required without PCB revision |
| MC9RS08KA2CSC | RS08 core, 2 KB flash, 128 B RAM, no KBI or TIM - smaller footprint and lower cost | Limited to simpler tasks like LED sequencing or basic sensor readout without timing-critical control | Choose for ultra-low-cost, low-complexity applications where HCS08 peripherals are unnecessary |
Compared with MC68HC908GR8CFA, the MC68HC908GR4CFA trades flash capacity for lower unit cost and smaller die size, while retaining identical peripheral functionality and debug interface; versus MC9RS08KA2CSC, it delivers significantly higher real-time control capability at modest cost premium.
Availability
MC68HC908GR4CFA is available at Aetrix Electronics and suitable for industrial sensor nodes, home appliance motor controllers, smart power outlets, and legacy industrial I/O modules requiring stable component supply across multi-year production cycles.
Supply support for MC68HC908GR4CFA 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) was a leading designer of embedded controllers, analog, and RF solutions, emphasizing automotive, industrial, and consumer applications.
The MC68HC908GR4CFA belongs to the HCS08 microcontroller family, engineered for cost-sensitive, low-power real-time control in appliances, sensors, and industrial equipment with integrated mixed-signal peripherals and robust debug support.
FAQ
What is the maximum operating frequency of the MC68HC908GR4CFA?
The MC68HC908GR4CFA 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 resolution - for example, TIM input capture accuracy and SCI baud rate stability scale directly with bus clock. The internal clock generator allows use of either an external crystal (1–8 MHz) or the internal oscillator.
Does the MC68HC908GR4CFA support in-system programming?
Yes, the MC68HC908GR4CFA supports in-system programming via its built-in Monitor ROM and Background Debug Mode (BDM) interface. Using a standard BDM pod and compatible development tools, firmware can be downloaded, verified, and debugged without removing the MC68HC908GR4CFA from the target board - enabling field updates and rapid prototyping.
What debug interface does the MC68HC908GR4CFA provide?
The MC68HC908GR4CFA features a single-wire Background Debug Mode (BDM) interface compliant with Motorola's BDM specification. This interface allows full visibility into CPU registers, memory, and peripheral states during runtime, supports hardware breakpoints, and enables non-intrusive flash programming - all using only the BKGD pin and ground connection.
Can the MC68HC908GR4CFA operate from a 3.3 V supply?
Yes, the MC68HC908GR4CFA is fully specified for operation from 3.0 V to 5.5 V, making it compatible with standard 3.3 V logic systems. At 3.0 V, maximum bus frequency is 4 MHz, and all I/O pins are 5 V tolerant - allowing safe interfacing with legacy 5 V peripherals without level shifters.
What peripheral modules are integrated into the MC68HC908GR4CFA?
The MC68HC908GR4CFA integrates an 8-channel 8-bit ADC, Serial Communications Interface (SCI), Serial Peripheral Interface (SPI), Timer Interface Module (TIM) with input capture/output compare, Keyboard Interrupt (KBI), Computer Operating Properly (COP) watchdog, Low-Voltage Inhibit (LVI), and System Integration Module (SIM) - delivering a complete control subsystem in a single 28-pin SOIC package.
MC68HC908GR4CFA 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:
- 4KB (4K 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:
MC68HC908GR4CFA FAQ
1.How can I place an order for MC68HC908GR4CFA through Aetrix?
Please submit a Request for Quotation (RFQ) for MC68HC908GR4CFA 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 MC68HC908GR4CFA reliable?
The price and inventory of MC68HC908GR4CFA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC68HC908GR4CFA is usually 5 days.
3.What payment methods are accepted for MC68HC908GR4CFA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC68HC908GR4CFA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC68HC908GR4CFA?
MC68HC908GR4CFA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC68HC908GR4CFA 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 MC68HC908GR4CFA?
For technical support, including MC68HC908GR4CFA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC68HC908GR4CFA requirements.
6.How does Aetrix verify that MC68HC908GR4CFA is sourced from the original manufacturer or authorized distributors?
All MC68HC908GR4CFA 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 MC68HC908GR4CFA meets industry standards.
7.What is the process for return or replacement of MC68HC908GR4CFA?
All MC68HC908GR4CFA units undergo pre-shipment inspection (PSI). If there is an issue with MC68HC908GR4CFA, 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 MC68HC908GR4CFA part is unused and in its original packaging.
Return procedure for MC68HC908GR4CFA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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