NXP Semiconductors MC68908GZ8CFAE

Overview

MC68908GZ8CFAE from Freescale Semiconductor is an 8-bit HCS08 microcontroller with 8 KB Flash, 512 B RAM, integrated 12-bit ADC (8-channel), MSCAN08 controller, ESCI and SPI interfaces, and a PLL-based clock generator. It operates at up to 20 MHz core frequency with 5 V supply and supports automotive-grade temperature range (–40°C to +125°C). It targets engine control units, body electronics, and industrial sensor nodes requiring CAN communication and mixed-signal integration.

For engineers reviewing the MC68908GZ8CFAE datasheet, MC68908GZ8CFAE pinout, MC68908GZ8CFAE application, or MC68908GZ8CFAE equivalent, key selection criteria include CAN 2.0A/B compliance, on-chip PLL lock time (<10 ms), Flash endurance (100k erase/write cycles), ADC sampling rate (up to 250 kSPS), and availability in 64-pin LQFP package with defined I/O drive strength (20 mA sink/source).

Technical Context

The MC68908GZ8CFAE implements the HCS08 CPU core with enhanced addressing modes and a 16-level hardware stack. Its Clock Generator Module integrates a crystal oscillator, PLL with programmable multiplier (×1 to ×32), and automatic acquisition/lock logic for stable system timing across voltage and temperature variations.

The MSCAN08 controller supports full CAN 2.0A/B protocol with three transmit buffers, two receive buffers, and configurable bit timing. The 12-bit ADC features selectable resolution (8/10/12-bit), software/hardware trigger, and conversion completion interrupt - all operating independently in Wait mode.

Key Specifications

Pinout & Package

MC68908GZ8CFAE is housed in a 64-pin LQFP (10 mm × 10 mm, 0.5 mm pitch) with exposed thermal pad. Pin assignments follow standard HCS08 GZ-series layout, including dedicated CAN TX/RX pins, ADC analog inputs, and dual power/ground sets for noise isolation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC9S08DZ128 and S9KEAZ128AMLH, the MC68908GZ8CFAE offers optimal balance of CAN hardware offload, Flash density, and thermal robustness for cost-sensitive automotive Tier-2 modules where deterministic 8-bit real-time performance remains critical.

Availability

MC68908GZ8CFAE is available at Aetrix Electronics and suitable for engine control units, body electronics modules, industrial sensor nodes, and motor drive interfaces requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MC68908GZ8CFAE 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 since 2015) pioneered automotive and industrial microcontrollers with emphasis on reliability, functional safety, and mixed-signal integration.

The MC68HC908GZ series was designed specifically for cost-optimized automotive body and powertrain applications requiring CAN connectivity, analog sensing, and robust operation in harsh environments.

FAQ

What is the maximum operating frequency of the MC68908GZ8CFAE core?

The MC68908GZ8CFAE core runs at up to 20 MHz, achieved via its integrated PLL that multiplies a 4–8 MHz crystal input. This frequency is sustained across the full –40°C to +125°C temperature range and 4.5–5.5 V supply, as verified in the Electrical Characteristics chapter of the Rev. 4.0 datasheet. The MC68908GZ8CFAE uses internal clock dividers to derive peripheral clocks without compromising timing margins.

Does the MC68908GZ8CFAE support CAN FD?

No, the MC68908GZ8CFAE implements the legacy MSCAN08 controller compliant only with CAN 2.0A/B (ISO 11898-1:2003) at up to 1 Mbit/s. It does not support CAN FD frame format, bit rate switching, or extended data length. For CAN FD functionality, designers should consider NXP's S32K1xx or Kinetis KV series, not the MC68908GZ8CFAE.

How many ADC channels does the MC68908GZ8CFAE support, and what is their resolution?

The MC68908GZ8CFAE integrates an 8-channel, 12-bit successive approximation register (SAR) ADC. Resolution is software-selectable between 8-bit, 10-bit, and 12-bit modes, with typical INL of ±1 LSB at 12-bit. All eight channels (AD0–AD7) map to PTB0–PTB7 pins and support single-ended or differential input configurations per the ADC chapter in the Rev. 4.0 datasheet.

Is the MC68908GZ8CFAE pin-compatible with the MC68HC908GZ8?

Yes, the MC68908GZ8CFAE is a direct replacement for the MC68HC908GZ8 in the same 64-pin LQFP package, sharing identical pinout, electrical characteristics, and memory map. The "CFAE" suffix denotes Freescale's automotive qualification grade (AEC-Q100 Grade 1), while functional behavior matches the base MC68HC908GZ8 device described in Appendix A of the Rev. 4.0 datasheet.

What debug interface does the MC68908GZ8CFAE support?

The MC68908GZ8CFAE supports background debug mode (BDM) via a dedicated single-wire interface using the BKGD pin (PTA0). This allows non-intrusive flash programming, real-time register inspection, and breakpoint execution without requiring additional JTAG pins. BDM is fully supported by Freescale's D-Bug12 and third-party tools like P&E Micro's Cyclone programmers.