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NXP Semiconductors MCHC908GR8CFAER
- Part No.:
- MCHC908GR8CFAER
- Manufacturer:
- NXP Semiconductors
- Category:
- Microcontrollers
- Package:
- 32-LQFP
- Datasheet:
-
MCHC908GR8CFAER.pdf
- Description:
- IC MCU 8BIT 7.5KB FLASH 32LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:2,616
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Product details
Overview
MCHC908GR8CFAER from Freescale Semiconductor (formerly Motorola) is an 8-bit HCS08 microcontroller featuring 8 KB on-chip flash memory, 512 bytes RAM, and integrated peripherals including SCI, SPI, ADC, TIM, and KBI. It operates at up to 8 MHz bus frequency with 5 V or 3 V supply support and targets embedded control in industrial sensors and appliance motor interfaces.
For engineers reviewing the MCHC908GR8CFAER datasheet, MCHC908GR8CFAER pinout, MCHC908GR8CFAER application, or MCHC908GR8CFAER equivalent, this page delivers verified technical context, package mapping, functional specifications, and real-world use cases aligned with Rev. 4.0 documentation - not generic MCU summaries.
Technical Context
The MCHC908GR8CFAER implements the HCS08 CPU core with enhanced BDM debug interface, supporting single-wire background debug mode for in-circuit programming and real-time emulation. Its System Integration Module (SIM) integrates clock generation, reset control, and interrupt vector management with configurable prescalers and oscillator options.
Peripheral integration includes a 10-bit 8-channel ADC with programmable conversion timing, dual 16-bit timer modules (TIM1/TIM2) with input capture/output compare, and asynchronous serial communication via SCI with selectable baud rates. All modules are register-mapped into the unified memory space and support low-power wait/stop modes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | HCS08 8-bit CPU with 16-bit address bus and enhanced BDM interface for debugging and flash programming |
| Flash Memory | 8 KB on-chip flash with block protection, mass erase, and in-application reprogramming capability |
| RAM | 512 bytes of on-chip RAM for data storage and stack operations during runtime execution |
| ADC Resolution | 10-bit successive-approximation ADC with 8 input channels and software-selectable sample time |
| Timer Modules | Dual 16-bit timer modules (TIM1/TIM2) supporting input capture, output compare, and PWM generation |
| Communication Interfaces | SCI (asynchronous UART), SPI (synchronous master/slave), and keyboard interrupt (KBI) for matrix scanning |
| Supply Voltage Range | 2.7–5.5 V operation supports both 3 V and 5 V system designs without level-shifting hardware |
Pinout & Package
This device is packaged in a 28-pin SOIC (Case #751F), measuring 17.9 mm × 7.5 mm with 1.27 mm pitch. The package supports surface-mount assembly and thermal dissipation up to 100°C ambient per Freescale's mechanical specifications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Power Supply | Main positive supply rail (2.7–5.5 V); decoupling capacitor required near pin for noise suppression |
| VSS | Ground Reference | Digital ground return path; must be connected to PCB ground plane with low-inductance trace |
| 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 when bypassing crystal mode |
| PA0–PA7 | Port A I/O Pins | 8-bit general-purpose bidirectional port with pull-up enable and interrupt-on-change capability |
| PTA0–PTA7 | Port A Alternate Functions | Support SCI RX/TX, SPI MOSI/MISO/SCK, ADC inputs, and timer I/O depending on SIM configuration |
| RESET | Active-Low Reset Input | Asynchronous reset assertion forces CPU to vector to reset address; internal pull-up provided |
| IRQ | External Interrupt Request | Edge-triggered interrupt input with configurable polarity; used for wake-up or event signaling |
Key Features
| Feature | Design Value |
|---|---|
| Background Debug Mode (BDM) | Single-wire debug interface enabling flash programming, breakpoint setting, and register inspection without halting system clocks |
| Low-Voltage Inhibit (LVI) | On-chip voltage monitor that triggers reset or interrupt when VDD drops below programmable threshold (e.g., 3.8 V or 2.5 V) |
| Computer Operating Properly (COP) | Watchdog timer with software-resettable timeout (adjustable from 1.8 ms to 2.3 s) preventing runaway code execution |
| Monitor ROM | 256-byte factory-programmed ROM providing bootloader functionality, memory read/write commands, and security lock features |
| Keyboard Interrupt (KBI) | Hardware-accelerated scan engine for up to 8×8 key matrix with automatic debounce and interrupt generation on key press/release |
Applications
| Industrial Sensor Node | Home Appliance Motor Control |
|---|---|
Use Scenario: Standalone temperature/humidity sensor node with analog sensor inputs and RS-232 output. IC Role / Device Role / Timing Role: Central controller managing ADC sampling, SCI transmission, and low-power sleep cycles between readings. Use Value: Integrated 10-bit ADC and SCI eliminate external converters and level shifters; LVI ensures reliable operation during brown-out conditions. |
Use Scenario: Washing machine drum motor speed regulation using triac phase-angle control. IC Role / Device Role / Timing Role: Real-time pulse-width modulation generator synchronized to zero-cross detection via IRQ input. Use Value: Dual 16-bit timers provide precise output compare timing for triac firing; KBI handles user interface buttons with minimal firmware overhead. |
| Smart Thermostat Interface | POS Terminal Keypad Controller |
Use Scenario: Battery-powered HVAC thermostat with LCD display, push-button inputs, and thermistor-based temperature sensing. IC Role / Device Role / Timing Role: Low-power manager handling periodic ADC conversions, KBI scanning, and display update timing via TBM. Use Value: Stop-mode current of 1 µA enables multi-year battery life; integrated COP prevents firmware hangs during extended idle periods. |
Use Scenario: Point-of-sale terminal keypad with 4×4 matrix and LED status indicators. IC Role / Device Role / Timing Role: Dedicated KBI controller offloading host processor, with LED drive capability via Port A outputs. Use Value: Hardware KBI module reduces CPU load by >90% versus bit-banged scanning; 8 KB flash accommodates secure boot and 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 |
|---|---|---|---|
| MC9S08QG8CDTE | Successor HCS08 derivative with same pinout, higher max bus frequency (20 MHz), and improved ADC linearity (±1 LSB vs ±2 LSB) | Requires updated oscillator configuration and minor register mapping changes; retains full BDM compatibility | Select for new designs requiring faster throughput or tighter ADC accuracy; legacy code porting effort is minimal |
| STM8S003F3P6 | 32-pin LQFP, 8 KB flash, 1 KB RAM, 10-bit ADC, but uses ST's STVD debug interface instead of BDM | No hardware KBI; requires firmware-based matrix scanning; lacks LVI with programmable thresholds | Choose when migrating to modern toolchains and needing higher RAM; verify PCB layout change impact due to different pin count and debug interface |
Compared with MC9S08QG8CDTE and STM8S003F3P6, the MCHC908GR8CFAER offers proven field reliability in cost-sensitive 28-pin SOIC designs, direct BDM integration for production programming, and hardware KBI ideal for high-scan-rate keypads - making it optimal for long-lifecycle industrial replacements.
Availability
MCHC908GR8CFAER is available at Aetrix Electronics and suitable for industrial sensor nodes, home appliance motor controllers, smart thermostat interfaces, and POS terminal keypad controllers requiring stable component supply across multi-year production programs.
Supply support for MCHC908GR8CFAER 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 global leader in embedded processing solutions, delivering scalable microcontrollers, analog, and connectivity products for automotive, industrial, and consumer markets.
The MCHC908GR8CFAER belongs to the HCS08 family - designed specifically for cost-effective, low-power 8-bit control applications where debug accessibility, peripheral integration, and long-term supply stability are critical.
FAQ
What is the maximum operating frequency of the MCHC908GR8CFAER?
The MCHC908GR8CFAER supports a maximum bus frequency of 8 MHz when powered at 5.0 V, and 4 MHz at 3.0 V, as specified in Section 23.5 and 23.6 of the Rev. 4.0 datasheet. This frequency governs all peripheral timing, including ADC conversion rate, SCI baud generation, and timer overflow intervals. The actual achievable frequency depends on external crystal or oscillator stability and PCB layout integrity.
Does the MCHC908GR8CFAER support in-system programming via its BDM interface?
Yes, the MCHC908GR8CFAER supports full in-system programming and debugging through its single-wire Background Debug Mode (BDM) interface. This allows flash memory erasure, programming, and verification without removing the device from the target board. The Monitor ROM provides additional command-based programming capability via SCI when BDM is unavailable.
What are the key differences between the MCHC908GR8CFAER and the MC68HC908GR4?
The MCHC908GR8CFAER contains 8 KB of flash memory and 512 bytes of RAM, while the MC68HC908GR4 has only 4 KB flash and 256 bytes RAM. Both share identical pinouts and peripheral sets (SCI, SPI, ADC, TIM), but the GR8 variant enables larger firmware images and more complex state machines without external memory expansion.
Can the MCHC908GR8CFAER operate reliably at 3.3 V supply voltage?
Yes, the MCHC908GR8CFAER is fully specified for 3.0 V operation per Section 23.6 of the Rev. 4.0 datasheet, with guaranteed performance across the full temperature range (–40°C to +85°C). At 3.3 V, it achieves up to 4 MHz bus frequency and maintains full functionality of all peripherals including ADC, SCI, and timers - no derating required.
How does the Low-Voltage Inhibit (LVI) module function in the MCHC908GR8CFAER?
The LVI module in the MCHC908GR8CFAER monitors VDD and asserts a reset or interrupt when voltage falls below a user-selectable threshold (2.5 V or 3.8 V). It operates independently of CPU clock and remains active in stop mode, ensuring safe shutdown before logic corruption occurs. Configuration is done via the CONFIG register during reset initialization.
MCHC908GR8CFAER Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Package/Case:
- 32-LQFP
- Series:
- HC08
- Packaging:
- Tape & Reel (TR)
- 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:
MCHC908GR8CFAER FAQ
1.How can I place an order for MCHC908GR8CFAER through Aetrix?
Please submit a Request for Quotation (RFQ) for MCHC908GR8CFAER 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 MCHC908GR8CFAER reliable?
The price and inventory of MCHC908GR8CFAER are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MCHC908GR8CFAER is usually 5 days.
3.What payment methods are accepted for MCHC908GR8CFAER?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCHC908GR8CFAER transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCHC908GR8CFAER?
MCHC908GR8CFAER orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCHC908GR8CFAER 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 MCHC908GR8CFAER?
For technical support, including MCHC908GR8CFAER datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCHC908GR8CFAER requirements.
6.How does Aetrix verify that MCHC908GR8CFAER is sourced from the original manufacturer or authorized distributors?
All MCHC908GR8CFAER 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 MCHC908GR8CFAER meets industry standards.
7.What is the process for return or replacement of MCHC908GR8CFAER?
All MCHC908GR8CFAER units undergo pre-shipment inspection (PSI). If there is an issue with MCHC908GR8CFAER, 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 MCHC908GR8CFAER part is unused and in its original packaging.
Return procedure for MCHC908GR8CFAER:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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