NXP Semiconductors MC68HC908GZ8VFA

Overview

MC68HC908GZ8VFA from NXP (formerly Freescale) is an 8-bit HCS08-core microcontroller featuring 8 KB on-chip Flash memory, 512 bytes RAM, and integrated peripherals including 8-channel 10-bit ADC, MSCAN08 CAN controller, ESCI and SPI serial interfaces, and a programmable PLL-based clock generator. It operates at up to 8 MHz bus frequency with 5 V supply and supports automotive-grade temperature range (–40°C to +125°C).

For engineers reviewing the MC68HC908GZ8VFA datasheet, MC68HC908GZ8VFA pinout, MC68HC908GZ8VFA application, or MC68HC908GZ8VFA equivalent, this device is selected for embedded control in harsh-environment automotive body electronics, industrial sensor nodes, and CAN-based distributed systems where flash reprogrammability, CAN protocol compliance, and extended temperature operation are required.

Technical Context

The MC68HC908GZ8VFA implements the HCS08 CPU core with enhanced addressing modes and low-power wait/stop modes. Its Clock Generator Module (CGM) integrates a crystal oscillator, PLL multiplier (×1 to ×32), and base clock selector to generate stable system clocks from external crystals or internal RC sources.

The integrated MSCAN08 module complies with ISO 11898-1 (CAN 2.0A/B) and supports message filtering, transmit/receive buffers, and error handling. The 10-bit ADC features configurable sample time, left/right-justified results, and hardware-triggered conversions synchronized to timer events.

Key Specifications

Pinout & Package

MC68HC908GZ8VFA is housed in a 64-pin LQFP package (10 mm × 10 mm, 0.5 mm pitch) with exposed thermal pad. Pin functions include dual power domains (VDD/VSS and VDDA/VSSA), dedicated CAN TX/RX pins (PTC6/CANTX, PTC7/CANRX), and multiplexed I/O across Ports A–E.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar microcontroller applications.

Compared with MC68HC908GZ8VFA, MC9S08DZ128 offers greater memory headroom and USB connectivity but requires PCB redesign; S9KEAZ128AMLH delivers modern ARM architecture and CAN FD yet increases BOM cost and software migration effort - MC68HC908GZ8VFA remains optimal for cost-sensitive, CAN 2.0–based legacy-compatible deployments.

Availability

MC68HC908GZ8VFA is available at Aetrix Electronics and suitable for automotive body electronics, industrial CAN networks, and off-highway equipment monitoring requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MC68HC908GZ8VFA 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 focused on secure connectivity solutions for automotive, industrial, and IoT applications, with deep heritage in microcontroller innovation dating to the Motorola 6800 family.

The MC68HC908GZ8VFA belongs to the HCS08 microcontroller family designed specifically for cost-effective, high-reliability embedded control in automotive and industrial environments where CAN integration, flash flexibility, and extended temperature operation are essential.

FAQ

What is the maximum bus frequency supported by the MC68HC908GZ8VFA?

The MC68HC908GZ8VFA supports a maximum bus frequency of 8 MHz, achieved using its integrated PLL to multiply lower-frequency crystal inputs (e.g., 4 MHz crystal ×2). This frequency is sustained across the full operating voltage (4.5–5.5 V) and temperature (–40°C to +125°C) range, enabling deterministic real-time execution in automotive control loops. The PLL configuration registers allow dynamic adjustment without reset.

Does the MC68HC908GZ8VFA support in-circuit debugging and programming?

Yes, the MC68HC908GZ8VFA supports in-circuit debugging and programming via the Background Debug Mode (BDM) interface using a single-wire connection (BKGD pin). This enables full read/write access to Flash and RAM, real-time variable inspection, and breakpoint insertion without requiring a separate debug header. The BDM module remains functional even in low-power stop mode when enabled.

How does the MSCAN08 module in the MC68HC908GZ8VFA differ from basic CAN controllers?

The MSCAN08 module in the MC68HC908GZ8VFA implements full ISO 11898-1 compliance, including automatic retransmission, bit stuffing, CRC calculation, and error confinement. It features 15 message buffers with individual ID masking and acceptance filtering, hardware timestamping, and wake-up-on-CAN capability - capabilities beyond basic CAN controllers that require external arbitration logic or software-managed buffers.

Can the MC68HC908GZ8VFA operate from an internal RC oscillator instead of a crystal?

Yes, the MC68HC908GZ8VFA can operate from its internal 32.768 kHz RC oscillator or use the CGM's internal 1–8 MHz RC source as a clock source. However, the PLL requires an external crystal or ceramic resonator on OSC1/OSC2 to achieve stable multiplication; RC-only operation limits bus frequency to ≤2 MHz and disables precision timing-critical functions like CAN bit timing calibration.

What packaging and RoHS compliance status does the MC68HC908GZ8VFA have?

The MC68HC908GZ8VFA is supplied in a 64-pin LQFP package (10 mm × 10 mm, 0.5 mm pitch) with exposed thermal pad and is RoHS-compliant (lead-free, halogen-free). It meets JEDEC J-STD-020 moisture sensitivity level MSL-3 and is qualified to AEC-Q100 Grade 1 for automotive use, ensuring reliability in reflow soldering and long-term operation under thermal cycling stress.