NXP Semiconductors MC68908GZ16VFJE

Overview

MC68908GZ16VFJE from Freescale Semiconductor is an 8-bit HCS08 microcontroller with 16 KB Flash, 512 B RAM, integrated 10-bit ADC (8-channel), dual serial interfaces (ESCI + SPI), and CAN 2.0A controller. It operates at up to 8 MHz bus frequency, supports low-power wait/stop modes, and targets automotive body electronics and industrial control systems requiring robust real-time I/O handling.

For engineers reviewing the MC68908GZ16VFJE datasheet, MC68908GZ16VFJE pinout, MC68908GZ16VFJE application, or MC68908GZ16VFJE equivalent, key selection criteria include its on-chip MSCAN08 controller, 40-pin QFP package with dedicated CAN TX/RX pins, Flash programmability in-system, and support for external crystal or internal oscillator with PLL-based clock generation.

Technical Context

The MC68908GZ16VFJE implements the CPU08 core with 16-bit index register, 8-bit accumulator, and condition-code-based branching. Its Clock Generator Module (CGM) integrates a crystal oscillator, PLL with programmable multiplier (×1–×32), and base clock selector enabling flexible system clock derivation from multiple sources including external crystals (1–8 MHz) or internal RC.

The device includes a dedicated MSCAN08 controller compliant with ISO 11898-1:2003, supporting standard CAN frames, message buffering, and automatic retransmission. Its ESCI module provides full-duplex UART functionality with selectable baud rates, while the SPI interface supports master/slave operation with configurable polarity and phase.

Key Specifications

Pinout & Package

MC68908GZ16VFJE is housed in a 40-pin Quad Flat Package (QFP) with 0.8 mm pitch, lead-free finish, and thermal pad. Pin assignments are defined per Freescale Document MC68HC908GZ16 Rev. 4.0, Section 1.4.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC9S08DZ128 and MC9S12XDP512, the MC68908GZ16VFJE offers optimal balance of CAN integration, compact 40-pin footprint, and proven qualification for under-hood automotive environments - making it ideal for cost-sensitive, single-CAN-node applications where USB or large memory are unnecessary.

Availability

MC68908GZ16VFJE is available at Aetrix Electronics and suitable for automotive body electronics, industrial motor control, instrument clusters, and smart power distribution units requiring stable component supply and long-term lifecycle support.

Supply support for MC68908GZ16VFJE 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) designed high-reliability microcontrollers for automotive and industrial markets, emphasizing functional safety, EMC robustness, and extended temperature operation.

The MC68HC08 family - including the MC68908GZ16VFJE - was engineered specifically for cost-effective, real-time control in automotive body electronics, featuring integrated CAN, low-power modes, and Flash memory optimized for field updates.

FAQ

What is the maximum operating frequency of the MC68908GZ16VFJE?

The MC68908GZ16VFJE supports a maximum bus frequency of 8 MHz, derived from its internal PLL which can multiply an external crystal (1–8 MHz) up to 32 MHz and divide by 2–4. The CPU executes instructions at bus speed, delivering deterministic real-time response for time-critical control loops in automotive applications.

Does the MC68908GZ16VFJE include a built-in CAN controller?

Yes, the MC68908GZ16VFJE integrates the MSCAN08 controller compliant with CAN 2.0A specification. It provides 32 message buffers, programmable acceptance filtering, automatic retransmission, and dedicated CANTX/CANRX pins (PTC6/PTC5), eliminating the need for an external CAN protocol controller in basic node implementations.

What packaging and RoHS compliance status does the MC68908GZ16VFJE have?

The MC68908GZ16VFJE is supplied in a 40-pin QFP package with lead-free (Pb-free) finish and RoHS-compliant construction. Its mechanical specifications - including dimensions, land pattern, and thermal pad layout - are documented in Freescale's MC68HC908GZ16 Rev. 4.0, Section 22.

Can the MC68908GZ16VFJE operate from an internal oscillator without an external crystal?

Yes, the MC68908GZ16VFJE supports internal RC oscillator operation as a fallback or low-cost option. However, for CAN timing accuracy and EMI control, Freescale recommends using an external crystal (typically 4 or 8 MHz) with the integrated PLL to meet ISO 11898 bit-timing tolerances; internal RC alone does not satisfy CAN conformance requirements.

How is Flash memory programmed and protected on the MC68908GZ16VFJE?

Flash programming on the MC68908GZ16VFJE is performed in-system via background debug mode (BDM) using standard Freescale tools. Protection is enforced through the Flash Block Protect Register (FBPROT), allowing selective locking of 512-byte blocks to prevent accidental erasure or overwrite of bootloader or calibration data during field updates.