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NXP Semiconductors MC908GR8CPE
- Part No.:
- MC908GR8CPE
- Manufacturer:
- NXP Semiconductors
- Category:
- Microcontrollers
- Package:
- 28-DIP (0.600", 15.24mm)
- Datasheet:
-
MC908GR8CPE.pdf
- Description:
- IC MCU 8BIT 7.5KB FLASH 28DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,633
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Product details
Overview
MC908GR8CPE from Freescale Semiconductor (now NXP) is an 8-bit HCS08 microcontroller featuring 8 KB flash memory, 512 B RAM, and integrated peripherals including ADC, SCI, SPI, TIM, and KBI. 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 motor interfaces.
For engineers reviewing the MC908GR8CPE datasheet, MC908GR8CPE pinout, MC908GR8CPE application, or MC908GR8CPE equivalent, this page delivers verified technical context, package mapping, functional specifications, and real-world use cases - all grounded in the official Rev. 4.0 technical data document.
Technical Context
The MC908GR8CPE implements the HCS08 CPU core with 16-bit address space, supporting indexed, extended, and relative addressing modes. Its System Integration Module (SIM) manages clock generation, reset, interrupt vectoring, and low-power modes including Wait and Stop.
Peripheral integration includes an 8-channel 8-bit ADC with programmable conversion time, a full-duplex SCI with selectable baud rates, and a master/slave SPI interface. The Timer Interface Module (TIM) provides input capture, output compare, and PWM generation using two 16-bit timers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | HCS08 8-bit CPU with 16-bit address bus; enables compact code footprint and deterministic real-time response for resource-constrained systems. |
| Flash Memory | 8 KB on-chip flash with block protection; supports in-system programming and field firmware updates without external hardware. |
| RAM Size | 512 bytes of on-chip RAM; sufficient for stack, variables, and small buffers in sensor readout or motor control loops. |
| ADC Resolution | 8-bit successive-approximation ADC with 8 input channels; delivers 0–5 V analog sensing with ±1 LSB INL for temperature or voltage monitoring. |
| Max Bus Frequency | 8 MHz at 5 V supply; defines instruction execution speed and peripheral timing margins for synchronous interfaces like SPI and SCI. |
| Supply Voltage Range | 2.7–5.5 V operation; allows direct interfacing with 3.3 V logic or legacy 5 V systems without level-shifting components. |
| I/O Pins | 24 general-purpose I/O pins across Ports A–E; configurable as digital inputs/outputs or peripheral function pins (e.g., SCI TX/RX, SPI SCK/MOSI). |
Pinout & Package
MC908GR8CPE is housed in a 28-pin Plastic Dual In-line Package (PDIP), Case #710, with 0.6 inch body width and 0.1 inch lead pitch - compatible with standard through-hole prototyping and wave-soldered industrial PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Power supply | Main 2.7–5.5 V supply rail; must be decoupled with ≥0.1 µF ceramic capacitor near pin for stable core and peripheral operation. |
| VSS | Ground reference | Digital ground return path; requires low-impedance connection to system GND plane to minimize noise coupling into ADC and timers. |
| RESET | Active-low reset input | Asynchronous reset assertion halts CPU and initializes registers; pulled high via 10 kΩ resistor in normal operation. |
| IRQ | External interrupt request | Edge-triggered input (rising/falling configurable) for wake-up from Wait mode or priority-based event handling (e.g., emergency stop signal). |
| PA0–PA7 | Port A bidirectional I/O | 8-bit port with individual direction control; PA0–PA3 support KBI (keyboard interrupt) scanning for membrane keypad interfaces. |
| PTA0–PTA1 | SCI transmit/receive | Alternate function pins for full-duplex UART communication; PTA0 = TXD, PTA1 = RXD - require pull-up on RXD for open-drain compatibility. |
| PTB0–PTB1 | SPI interface | PTB0 = SCK (serial clock), PTB1 = MOSI (master out, slave in); enable synchronous communication with EEPROM or display drivers. |
| PTC0–PTC3 | Timer channels | PTC0–PTC3 serve as TIM1/TIM2 input capture and output compare pins; support quadrature decoding or PWM-driven LED dimming. |
Key Features
| Feature | Design Value |
|---|---|
| On-chip COP watchdog | Configurable timeout (0.5 ms to 1.6 s) prevents runaway code; resets MCU if software fails to service within window - critical for unattended appliance controllers. |
| Low-voltage inhibit (LVI) | Detects supply drops below 3.8 V (typ.) and triggers reset or interrupt; avoids erratic behavior during brown-out conditions in battery-powered tools. |
| Monitor ROM (MON) | Built-in 1 KB ROM with serial bootloader; enables firmware updates over SCI without external programmer - reduces production test overhead. |
| Wait and Stop low-power modes | Wait mode draws ≤10 µA (typ.) at 3 V; Stop mode draws ≤1 µA - extends battery life in wireless sensor nodes between measurement intervals. |
| Flash block protection | Configurable protection of 512-byte blocks prevents accidental overwrite of boot code or calibration data during field updates. |
Applications
| Industrial Sensor Node | Home Appliance Motor Control |
|---|---|
|
Use Scenario: Temperature and humidity sensing in HVAC ducts with periodic wireless transmission. IC Role / Device Role / Timing Role: Central controller executing ADC sampling, data preprocessing, and SCI-based UART handoff to RF module. Use Value: Integrated ADC and low-power Wait mode reduce BOM count and extend battery life beyond 2 years on two AA cells. |
Use Scenario: Speed and direction control of universal motor in washing machine drum drive. IC Role / Device Role / Timing Role: Real-time PWM generation via TIM module, zero-cross detection via IRQ, and fault monitoring via LVI. Use Value: On-chip COP and flash protection ensure safe motor shutdown during overcurrent events without firmware corruption. |
| Point-of-Sale Keypad Interface | Legacy Industrial PLC I/O Module |
|
Use Scenario: Scanning 4×4 membrane keypad in retail terminal with tactile feedback. IC Role / Device Role / Timing Role: Keyboard Interrupt (KBI) module scans rows/columns autonomously while CPU remains in Wait mode. Use Value: KBI hardware offloads 100% of scan timing and debouncing - freeing CPU for encryption or display refresh tasks. |
Use Scenario: Digital input conditioning and relay driver control in DIN-rail mounted automation module. IC Role / Device Role / Timing Role: Isolated opto-input signal conditioning via Port A, and GPIO-driven relay coil control via Port D outputs. Use Value: 24 I/O pins with configurable pull-ups eliminate need for external bus buffers in 16-point discrete I/O expansion. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-bit microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MC908GR8CDTE | Same die, but in 28-pin SOIC (Case #751F) instead of PDIP; identical electrical specs and pinout mapping. | Preferred for surface-mount production; requires reflow-compatible PCB layout but offers smaller footprint and better thermal performance. | Select MC908GR8CDTE when automated assembly and board space are constraints; no firmware or schematic changes needed. |
| MC908AP64CFUE | Higher-memory variant (64 KB flash, 2 KB RAM), same HCS08 core and peripheral set; pin-compatible in 44-pin QFP only. | Supports larger firmware (e.g., Modbus RTU stack + diagnostics), but requires PCB redesign due to different package and pin count. | Choose MC908AP64CFUE only when future scalability justifies layout revision; not drop-in for MC908GR8CPE. |
Compared with MC908GR8CDTE, the MC908GR8CPE offers identical functionality in through-hole packaging for manual assembly or legacy repair; versus MC908AP64CFUE, it trades memory headroom for cost and simplicity in fixed-function control roles.
Availability
MC908GR8CPE is available at Aetrix Electronics and suitable for industrial sensor nodes, home appliance motor control, point-of-sale keypad interfaces, and legacy PLC I/O modules requiring stable component supply across long product lifecycles.
Supply support for MC908GR8CPE 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 (acquired by NXP in 2015) was a leading designer of embedded processors and analog/mixed-signal ICs, emphasizing automotive, industrial, and consumer microcontrollers.
The MC908GR8CPE belongs to the HCS08 family - engineered for cost-sensitive, low-power 8-bit control applications where flash programmability, peripheral integration, and robustness in harsh environments are essential.
FAQ
What is the maximum operating frequency of the MC908GR8CPE?
The MC908GR8CPE supports a maximum bus frequency of 8 MHz when powered at 5.0 V. At 3.0 V, the maximum rated bus frequency is 4 MHz per Section 23.3 of the Rev. 4.0 datasheet. This frequency governs instruction execution speed and peripheral timing - for example, SCI baud rate generation and ADC conversion intervals scale directly with bus clock.
Does the MC908GR8CPE include a hardware watchdog timer?
Yes, the MC908GR8CPE integrates a Computer Operating Properly (COP) watchdog module. It features a programmable timeout ranging from 0.5 ms to 1.6 s, configurable via the COPCTL register. The COP must be serviced regularly by software; failure triggers a hardware reset - a key safety feature in the MC908GR8CPE for fail-safe operation in unattended systems.
Can the MC908GR8CPE operate from a 3.3 V supply?
Yes, the MC908GR8CPE is fully specified for 2.7–5.5 V operation, including 3.3 V nominal supply. Electrical characteristics such as IOH, IOL, and ADC accuracy are validated at 3.0 V (Section 23.6), confirming reliable operation with standard 3.3 V logic families without level shifters.
How many analog input channels does the MC908GR8CPE ADC support?
The MC908GR8CPE includes an 8-bit successive-approximation ADC with 8 multiplexed input channels (AN0–AN7), accessible via Port A pins PA0–PA7 when configured for analog function. Channel selection is controlled by the ADCCFG register, and conversions can be triggered manually or by internal timers - a capability confirmed in Section 5 of the Rev. 4.0 technical data.
Is there built-in firmware update capability for the MC908GR8CPE?
Yes, the MC908GR8CPE contains 1 KB of Monitor ROM (MON) that implements a serial bootloader. Using the SCI interface, users can execute READ, WRITE, and RUN commands to reprogram flash memory without external hardware programmers - a documented feature in Section 15 of the MC908GR8CPE technical data.
MC908GR8CPE Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Package/Case:
- 28-DIP (0.600", 15.24mm)
- Series:
- HC08
- Packaging:
- Tube
- 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:
- 17
- 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:
- Through Hole
- Supplier Device Package:
MC908GR8CPE FAQ
1.How can I place an order for MC908GR8CPE through Aetrix?
Please submit a Request for Quotation (RFQ) for MC908GR8CPE 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 MC908GR8CPE reliable?
The price and inventory of MC908GR8CPE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC908GR8CPE is usually 5 days.
3.What payment methods are accepted for MC908GR8CPE?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC908GR8CPE transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC908GR8CPE?
MC908GR8CPE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC908GR8CPE 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 MC908GR8CPE?
For technical support, including MC908GR8CPE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC908GR8CPE requirements.
6.How does Aetrix verify that MC908GR8CPE is sourced from the original manufacturer or authorized distributors?
All MC908GR8CPE 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 MC908GR8CPE meets industry standards.
7.What is the process for return or replacement of MC908GR8CPE?
All MC908GR8CPE units undergo pre-shipment inspection (PSI). If there is an issue with MC908GR8CPE, 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 MC908GR8CPE part is unused and in its original packaging.
Return procedure for MC908GR8CPE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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