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NXP Semiconductors MC68HC908GR16VFA
- Part No.:
- MC68HC908GR16VFA
- Manufacturer:
- NXP Semiconductors
- Category:
- Microcontrollers
- Package:
- 48-LQFP
- Datasheet:
-
MC68HC908GR16VFA.pdf
- Description:
- IC MCU 8BIT 16KB FLASH 48LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:4,698
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Product details
Overview
MC68HC908GR16VFA from NXP Semiconductors (formerly Freescale) is an 8-bit HCS08-core microcontroller with 16 KB on-chip Flash, 512 B RAM, and integrated peripherals including ADC, SPI, ESCI, TIM, KBI, and CGM with PLL-based clock generation. It operates at up to 8 MHz bus frequency, supports 2.7–5.5 V supply, and targets low-cost industrial control and appliance applications.
For engineers reviewing the MC68HC908GR16VFA datasheet, MC68HC908GR16VFA pinout, MC68HC908GR16VFA application, or MC68HC908GR16VFA equivalent, key selection criteria include its 44-pin QFP package, 8-channel 10-bit ADC, PLL-configurable clock source, COP watchdog, and support for Wait/Stop low-power modes in embedded systems requiring deterministic timing and flash reprogrammability.
Technical Context
The MC68HC908GR16VFA implements the HCS08 CPU core with 16-bit address space, indexed addressing, and 59-instruction set optimized for compact code. Its Clock Generator Module integrates a crystal oscillator, PLL with programmable multiplier (×1 to ×32), and base clock selector enabling precise bus clock derivation from external crystals or internal RC sources.
The device features a 10-bit successive-approximation ADC with 8 input channels, configurable sample time, and result justification modes; an Enhanced Serial Communications Interface (ESCI) supporting asynchronous UART operation with programmable baud rate; and a 16-bit Timer Interface Module with two independent capture/compare channels and input capture noise filtering.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core | HCS08 8-bit CPU with 16-bit address bus and 59-instruction set - enables efficient control logic and interrupt handling in resource-constrained systems. |
| Flash Memory | 16 KB on-chip Flash with block protection - supports field firmware updates and secure code storage without external memory. |
| RAM | 512 bytes on-chip RAM - sufficient for stack, variables, and small buffers in real-time control tasks. |
| ADC | 10-bit SAR ADC with 8 channels, ±1 LSB INL - delivers accurate analog sensing for motor feedback, temperature, or voltage monitoring. |
| Max Bus Frequency | 8 MHz - determines instruction throughput and peripheral timing margins for deterministic real-time response. |
| Supply Voltage | 2.7–5.5 V - allows direct interface with 3.3 V or 5 V logic and compatibility with legacy industrial power rails. |
| Operating Temp | –40°C to +85°C - qualified for industrial environments including HVAC, motor drives, and factory automation. |
Pinout & Package
MC68HC908GR16VFA is housed in a 44-pin LQFP (7 mm × 7 mm, 0.8 mm pitch) package with exposed thermal pad. Pin functions are defined per Chapter 1.4 and 1.5 of the Rev. 5.0 datasheet, including dedicated I/O ports, analog inputs, oscillator, reset, and communication interface pins.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD / VSS | Power supply and ground | Primary digital power domain; decoupling required within 10 mm of pins for stable 2.7–5.5 V operation. |
| OSC1 / OSC2 | Crystal oscillator inputs | Accepts 1–8 MHz parallel-resonant quartz crystal; enables precise clock source for PLL and system timing. |
| RST | Active-low reset input | Asynchronous hardware reset; internal pull-up ensures reliable startup without external resistor. |
| PTA0–PTA7 | Port A bidirectional I/O | Configurable as general-purpose I/O or keyboard scan inputs (KBD0–KBD7) with internal pull-ups. |
| PTB0–PTB7 | Port B bidirectional I/O | Supports ADC analog inputs (AD0–AD7) and general-purpose digital I/O with slew-rate control. |
| PTD0–PTD7 | Port D bidirectional I/O | Includes SPI slave select (SS), timer channel 2 input (T2CH1), and serial peripheral interface signals. |
| PTE0 / PTE2–PTE5 | Port E bidirectional I/O | PTE0 serves as ESCI transmit output (TxD); PTE2–PTE5 support ESCI receive (RxD), clock, and chip select functions. |
Key Features
| Feature | Design Value |
|---|---|
| PLL-based CGM | Programmable ×1–×32 multiplication enables flexible bus clock generation from low-frequency crystals, reducing EMI and simplifying board layout. |
| Flash Block Protection | Independent protection of 512-byte blocks prevents accidental overwrite of bootloader or calibration data during field updates. |
| COP Watchdog | Configurable timeout (0.5 ms to 1.1 s) with optional disable via CONFIG register - ensures fail-safe recovery in safety-critical control loops. |
| Keyboard Interrupt Module | Hardware scanning of up to 8 keys with debounce filtering and wake-from-Stop capability - reduces MCU polling overhead in HMI applications. |
| Low-Power Modes | Wait mode (CPU halted, peripherals active) and Stop mode (all clocks gated, RAM retained) achieve <1 µA current draw for battery-powered operation. |
Applications
| Industrial Motor Control | Home Appliance UI |
|---|---|
Use Scenario: Closed-loop speed regulation of BLDC fans using hall-effect sensor feedback and PWM-driven gate drivers. IC Role / Device Role / Timing Role: Central controller executing PID algorithm, sampling ADC channels, generating 16-bit PWM, and managing ESCI-based diagnostics. Use Value: Integrated 10-bit ADC and dual-channel TIM enable precise current/voltage measurement and synchronized commutation timing without external components. | Use Scenario: Keypad-driven user interface for washing machine cycle selection, display update, and door lock control. IC Role / Device Role / Timing Role: HMI coordinator managing KBI-scan interrupts, driving 7-segment LED via port toggling, and communicating with main controller over ESCI UART. Use Value: Hardware KBI module offloads key-debounce processing, while 16 KB Flash stores localized UI firmware and language strings. |
| Smart Sensor Node | Power Supply Monitoring |
Use Scenario: Battery-powered environmental sensor collecting temperature/humidity and transmitting data wirelessly via UART-to-LoRa bridge. IC Role / Device Role / Timing Role: Data acquisition engine performing periodic ADC conversions, applying calibration coefficients from Flash, and formatting packets for ESCI transmission. Use Value: Stop-mode current <1 µA extends battery life; on-chip Flash retains calibration data across power cycles without EEPROM. | Use Scenario: Real-time monitoring of 12 V DC input rail in telecom power shelf, detecting brownout and initiating graceful shutdown. IC Role / Device Role / Timing Role: Supervisor IC measuring scaled input voltage via ADC channel, comparing against LVI thresholds, and asserting fault signal via GPIO. Use Value: Integrated Low-Voltage Inhibit (LVI) module provides hardware reset at 2.5 V ±0.1 V, complementing software ADC checks for robust power failure detection. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MC9RS08KA8CFDR | RS08 core, 8 KB Flash, no PLL, max 20 MHz bus, smaller 20-pin SOIC package | Lacks PLL-based clock synthesis and 10-bit ADC; suited for simpler timing and I/O tasks only | Select when cost and footprint are critical and advanced analog/peripheral features are unnecessary. |
| S9KEAZ128AMLH | Kinetis E-series ARM Cortex-M0+, 128 KB Flash, 16 KB RAM, 12-bit ADC, full-speed USB, 50 MHz core | Higher performance, richer peripheral set, and modern toolchain support but requires PCB redesign and firmware migration | Choose for new designs needing scalability, USB connectivity, or future-proofing beyond 8-bit constraints. |
Compared with MC9RS08KA8CFDR, the MC68HC908GR16VFA offers superior analog integration and clock flexibility; versus S9KEAZ128AMLH, it provides lower BOM cost and simpler certification path for legacy industrial deployments where ARM migration is unjustified.
Availability
MC68HC908GR16VFA is available at Aetrix Electronics and suitable for industrial motor control, home appliance UI, smart sensor node, and power supply monitoring applications requiring stable component supply and long-term lifecycle support.
Supply support for MC68HC908GR16VFA 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 leader delivering secure, scalable solutions for automotive, industrial, IoT, and communication infrastructure markets.
The MC68HC908GR16VFA belongs to the legacy HCS08 microcontroller family, designed specifically for cost-sensitive, low-power embedded control applications demanding high reliability, Flash programmability, and integrated analog/mixed-signal functionality.
FAQ
What is the maximum operating frequency of the MC68HC908GR16VFA?
The MC68HC908GR16VFA supports a maximum bus clock frequency of 8 MHz, derived from its internal PLL which multiplies an external crystal input (1–8 MHz) by factors of 1 to 32. This frequency governs instruction execution speed, ADC conversion timing, and peripheral module operation - all timing-critical parameters validated across the –40°C to +85°C temperature range per the Rev. 5.0 datasheet.
Does the MC68HC908GR16VFA include a hardware watchdog timer?
Yes, the MC68HC908GR16VFA integrates a Computer Operating Properly (COP) watchdog module with configurable timeout periods ranging from 0.5 ms to 1.1 s. The COP can be enabled or disabled via the CONFIG register, and its clock source is selectable between CGMXCLK or an internal RC oscillator - providing fail-safe recovery for the MC68HC908GR16VFA in unattended industrial control applications.
Can the MC68HC908GR16VFA perform analog-to-digital conversion?
Yes, the MC68HC908GR16VFA includes a 10-bit successive-approximation ADC with 8 input channels (AD0–AD7), programmable sample time, and selectable left/right justification. It supports differential and single-ended modes, achieves ±1 LSB integral nonlinearity, and operates across the full 2.7–5.5 V supply range - making it suitable for precision sensing tasks within the MC68HC908GR16VFA's target applications.
What package type is used for the MC68HC908GR16VFA?
The MC68HC908GR16VFA is packaged in a 44-pin Low-Profile Quad Flat Package (LQFP) measuring 7 mm × 7 mm with 0.8 mm lead pitch and an exposed thermal pad. This RoHS-compliant package is specified in Section 21.1 of the Rev. 5.0 datasheet and supports standard reflow soldering processes for high-volume manufacturing of the MC68HC908GR16VFA.
Is the MC68HC908GR16VFA supported by modern development tools?
While the MC68HC908GR16VFA is a legacy HCS08 device, it remains supported by CodeWarrior Development Studio for Microcontrollers (v10.x and earlier) and compatible PEMicro debug interfaces. NXP maintains archived documentation, S-record loaders, and reference schematics for the MC68HC908GR16VFA, ensuring continued maintainability for installed industrial base systems.
MC68HC908GR16VFA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Package/Case:
- 48-LQFP
- Series:
- HC08
- Packaging:
- Tray
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Core Processor:
- HC08
- Core Size:
- 8-Bit
- Speed:
- 8MHz
- Connectivity:
- LINbus, SCI, SPI
- Peripherals:
- LVD, POR, PWM
- Number of I/O:
- 37
- Program Memory Size:
- 16KB (16K x 8)
- Program Memory Type:
- FLASH
- EEPROM Size:
- -
- RAM Size:
- 1K x 8
- Voltage - Supply (Vcc/Vdd):
- 3V ~ 5.5V
- Data Converters:
- A/D 8x10b
- Oscillator Type:
- Internal
- Operating Temperature:
- -40°C ~ 105°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
MC68HC908GR16VFA FAQ
1.How can I place an order for MC68HC908GR16VFA through Aetrix?
Please submit a Request for Quotation (RFQ) for MC68HC908GR16VFA 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 MC68HC908GR16VFA reliable?
The price and inventory of MC68HC908GR16VFA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC68HC908GR16VFA is usually 5 days.
3.What payment methods are accepted for MC68HC908GR16VFA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC68HC908GR16VFA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC68HC908GR16VFA?
MC68HC908GR16VFA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC68HC908GR16VFA 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 MC68HC908GR16VFA?
For technical support, including MC68HC908GR16VFA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC68HC908GR16VFA requirements.
6.How does Aetrix verify that MC68HC908GR16VFA is sourced from the original manufacturer or authorized distributors?
All MC68HC908GR16VFA 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 MC68HC908GR16VFA meets industry standards.
7.What is the process for return or replacement of MC68HC908GR16VFA?
All MC68HC908GR16VFA units undergo pre-shipment inspection (PSI). If there is an issue with MC68HC908GR16VFA, 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 MC68HC908GR16VFA part is unused and in its original packaging.
Return procedure for MC68HC908GR16VFA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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