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NXP Semiconductors MCHC908GR8ACFAE
- Part No.:
- MCHC908GR8ACFAE
- Manufacturer:
- NXP Semiconductors
- Category:
- Microcontrollers
- Package:
- 32-LQFP
- Datasheet:
-
MCHC908GR8ACFAE.pdf
- Description:
- IC MCU 8BIT 7.5KB FLASH 32LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:2,997
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Product details
Overview
MCHC908GR8ACFAE from NXP Semiconductors (formerly Freescale) is an 8-bit HCS08 core microcontroller with 8 KB on-chip FLASH, 512 B RAM, and integrated peripherals including ADC, SCI, SPI, TIM, KBI, and COP watchdog. It operates at up to 8 MHz bus frequency, supports 3.0–5.5 V supply, and targets low-cost embedded control in appliance motor drives and industrial sensor nodes.
For engineers reviewing the MCHC908GR8ACFAE datasheet, MCHC908GR8ACFAE pinout, MCHC908GR8ACFAE application, or MCHC908GR8ACFAE equivalent, key selection criteria include FLASH endurance (100k erase/write cycles), 8-channel 8-bit ADC with 25 µs conversion time, SCI asynchronous serial interface, and 20-pin SOIC package compatibility with legacy HC08 designs.
Technical Context
The MCHC908GR8ACFAE implements the HCS08 CPU core with 16-bit address space, indexed addressing modes, and 72-instruction set. Its Clock Generator Module (CGM) integrates a crystal oscillator and PLL for flexible clock synthesis, supporting both internal RC and external crystal sources with programmable multiplication factors.
Low-power operation is enabled via WAIT and STOP modes, with STOP current as low as 1 µA (typical) and wake-up via IRQ, KBI, or SCI. The System Integration Module (SIM) coordinates peripheral clocks, reset sources, and COP timeout configuration using the CONFIG register.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core | HCS08 8-bit CPU with 16-bit address bus and indexed addressing support |
| FLASH Memory | 8 KB on-chip FLASH with 100,000 erase/write cycles and block protection |
| RAM | 512 bytes of on-chip RAM for data and stack storage |
| ADC | 8-channel 8-bit successive-approximation ADC with 25 µs max conversion time |
| Serial Interfaces | SCI (asynchronous UART) + SPI (master/slave) + KBI (keyboard interrupt) |
| Timers | Two 16-bit timer modules (TIM1/TIM2) with input capture, output compare, and PWM |
| Supply Voltage | 3.0 V to 5.5 V DC - enables direct interface with 3.3 V and 5 V logic systems |
| Operating Temp | –40 °C to +85 °C - qualified for industrial ambient environments |
Pinout & Package
Package: 20-pin SOIC (Small Outline Integrated Circuit), 0.300-inch body width, RoHS-compliant lead finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD, VSS | Power supply and ground | Main digital power domain; decoupling required within 10 mm of pins |
| OSC1, OSC2 | Crystal oscillator inputs | Supports 1–8 MHz fundamental-mode crystals; internal load caps configurable |
| RST | Active-low reset input | Asynchronous reset with internal pull-up; accepts external push-button or supervisor IC |
| IRQ | External interrupt request | Edge-triggered interrupt source with priority over most peripherals |
| PTA0–PTA3 | Port A I/O with KBI function | Configurable as general-purpose I/O or keyboard scan inputs (KBD0–KBD3) |
| PTB0–PTB5 | Port B I/O with ADC inputs | Shared with ADC channels AD0–AD5; analog input range = 0–VDD |
| PTC0, PTC1 | Port C I/O | Dedicated GPIO with no peripheral multiplexing |
| PTD0–PTD6 | Port D I/O with SPI/SCI/TIM functions | Includes SS (slave select), SCK, MOSI/MISO, RxD/TxD, T2CH0 |
| PTE0, PTE1 | SCI transmit/receive | Full-duplex UART interface; supports 300–115.2 kbps baud rates |
Key Features
| Feature | Design Value |
|---|---|
| FLASH Block Protection | Enables selective write-protection of memory pages to prevent accidental firmware overwrite |
| COP Watchdog Timer | Configurable timeout (0.5 ms to 1.0 s) with independent clock source (CGMXCLK) |
| Low-Voltage Inhibit (LVI) | Monitors VDD and asserts reset if voltage drops below 2.5 V (typical), ensuring reliable startup |
| Keyboard Interrupt Module (KBI) | Scans up to 4 keys with automatic wake-from-STOP detection and debounce filtering |
| SCI Auto-Baud Detection | Enables receiver to synchronize to unknown incoming bit rate using break character timing |
| STOP Mode Current | 1 µA typical - extends battery life in intermittent-sensing applications |
Applications
| Home Appliance Control | Industrial Sensor Node |
|---|---|
Use Scenario: Washing machine main control board managing motor sequencing, water valve actuation, and user interface. IC Role / Device Role / Timing Role: Primary system controller executing real-time state machine logic and ADC-based temperature/level sensing. Use Value: Integrated KBI handles push-button inputs; 8-bit ADC digitizes thermistor and pressure transducer signals without external components. | Use Scenario: Battery-powered environmental monitor measuring temperature, humidity, and CO₂ in HVAC ducts. IC Role / Device Role / Timing Role: Low-power data acquisition node waking periodically to sample sensors and transmit via SCI to gateway. Use Value: STOP mode draws only 1 µA; built-in LVI prevents erratic behavior during brown-out; SCI supports RS-485 interface via external transceiver. |
| Motor Drive Interface | Legacy Industrial Equipment Upgrade |
Use Scenario: Brushless DC fan controller in server chassis cooling subsystem. IC Role / Device Role / Timing Role: Commutation sequencer generating six-step drive signals synchronized to hall-effect rotor position feedback. Use Value: Two 16-bit TIM modules provide precise edge-aligned PWM outputs; PTD6/T2CH0 captures hall sensor edges for closed-loop timing. | Use Scenario: Retrofitting aging PLC I/O modules with modern firmware-upgradable control logic. IC Role / Device Role / Timing Role: Drop-in replacement for obsolete MC68HC908GR8A in existing PCB layouts. Use Value: Pin-compatible 20-pin SOIC footprint and identical register map enable zero-hardware-change migration; same FLASH programming algorithm simplifies firmware porting. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MC9RS08KA8CFD | RS08 core, 8 KB FLASH, 1 KB RAM, no KBI, SCI-only serial interface | Lacks keyboard scan hardware; higher RAM supports larger protocol stacks | Preferred when UART-based communication dominates and key matrix is absent |
| MC9S08QG8CDTE | HCS08 core, 8 KB FLASH, 512 B RAM, 16-pin TSSOP, no SPI module | Smaller package reduces board area but removes SPI peripheral for display or EEPROM interfacing | Selected for space-constrained designs where SPI is unused and cost-per-pin matters |
Compared with MCHC908GR8ACFAE, the MC9RS08KA8CFD offers higher RAM but omits KBI and SPI-making it unsuitable for keypad-driven devices; the MC9S08QG8CDTE retains HCS08 compatibility and ADC capability but sacrifices SPI and uses a smaller 16-pin TSSOP, limiting I/O count and peripheral flexibility.
Availability
MCHC908GR8ACFAE is available at Aetrix Electronics and suitable for home appliance control, industrial sensor nodes, motor drive interfaces, and legacy equipment upgrades requiring stable component supply and long-term manufacturing continuity.
Supply support for MCHC908GR8ACFAE 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
NXP Semiconductors is a global semiconductor company specializing in secure connectivity solutions for automotive, industrial, and IoT applications.
The MCHC908GR8ACFAE belongs to the HCS08 microcontroller family, designed for cost-sensitive, low-power embedded control tasks requiring robust analog integration and field-proven reliability in harsh environments.
FAQ
What is the maximum bus frequency supported by the MCHC908GR8ACFAE?
The MCHC908GR8ACFAE supports a maximum bus frequency of 8 MHz. This is achieved using the internal PLL with appropriate CGM register configuration (e.g., PLL multiplier = 4x with 2 MHz crystal). The actual operating speed depends on VDD and temperature, and must comply with the 8 MHz limit specified in the DC characteristics table of the Rev. 5 datasheet.
Does the MCHC908GR8ACFAE include a hardware debug interface?
No, the MCHC908GR8ACFAE does not include a dedicated debug interface like SWD or JTAG. It relies on the on-chip Monitor Mode accessed via the BKGD pin (shared with PTA0) for basic in-circuit debugging and flash programming. Full development requires a compatible BDM (Background Debug Mode) pod and compatible IDE such as CodeWarrior for HCS08.
Can the MCHC908GR8ACFAE operate from a 3.3 V supply?
Yes, the MCHC908GR8ACFAE is fully specified for 3.0 V to 5.5 V operation per its electrical characteristics. At 3.3 V, it maintains full functionality including FLASH programming, ADC accuracy (±2 LSB INL), and 8 MHz bus operation - provided the external clock source meets timing requirements and adequate decoupling is used.
How many ADC channels does the MCHC908GR8ACFAE support, and what is their resolution?
The MCHC908GR8ACFAE supports eight single-ended ADC input channels (AD0–AD5 on PTB, plus two additional channels mapped to PTC0/PTC1 in certain configurations), all with 8-bit resolution. Conversion time is fixed at 25 µs per sample under standard conditions, and the ADC reference is tied to VDD unless external VREFH/VREFL pins are used.
Is the MCHC908GR8ACFAE pin-compatible with the original MC68HC908GR8A?
Yes, the MCHC908GR8ACFAE is a direct pin-compatible and register-compatible replacement for the MC68HC908GR8A. It shares identical 20-pin SOIC packaging, identical pin functions (including IRQ, RST, OSC1/OSC2, and all port mappings), and identical memory map and peripheral register layout - enabling drop-in replacement without PCB or firmware changes.
MCHC908GR8ACFAE Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Package/Case:
- 32-LQFP
- Series:
- HC08
- Packaging:
- Bulk
- 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:
MCHC908GR8ACFAE FAQ
1.How can I place an order for MCHC908GR8ACFAE through Aetrix?
Please submit a Request for Quotation (RFQ) for MCHC908GR8ACFAE 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 MCHC908GR8ACFAE reliable?
The price and inventory of MCHC908GR8ACFAE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MCHC908GR8ACFAE is usually 5 days.
3.What payment methods are accepted for MCHC908GR8ACFAE?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCHC908GR8ACFAE transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCHC908GR8ACFAE?
MCHC908GR8ACFAE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCHC908GR8ACFAE 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 MCHC908GR8ACFAE?
For technical support, including MCHC908GR8ACFAE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCHC908GR8ACFAE requirements.
6.How does Aetrix verify that MCHC908GR8ACFAE is sourced from the original manufacturer or authorized distributors?
All MCHC908GR8ACFAE 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 MCHC908GR8ACFAE meets industry standards.
7.What is the process for return or replacement of MCHC908GR8ACFAE?
All MCHC908GR8ACFAE units undergo pre-shipment inspection (PSI). If there is an issue with MCHC908GR8ACFAE, 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 MCHC908GR8ACFAE part is unused and in its original packaging.
Return procedure for MCHC908GR8ACFAE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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