NXP Semiconductors MC908AZ32AMFUE

Overview

MC908AZ32AMFUE from NXP Semiconductors (formerly Freescale) is an 8-bit HCS08 microcontroller featuring 32 KB on-chip Flash, 1 KB RAM, and integrated CAN 2.0A/B controller. It operates at up to 40 MHz bus speed with internal PLL clock generation, supports 5V operation, and includes 15-channel 10-bit ADC, SCI, SPI, two 16-bit TIM modules, and COP watchdog. It targets automotive body electronics and industrial control systems requiring robust real-time communication and mixed-signal processing.

For engineers reviewing the MC908AZ32AMFUE datasheet, MC908AZ32AMFUE pinout, MC908AZ32AMFUE application, or MC908AZ32AMFUE equivalent, key selection criteria include CAN interface support, Flash endurance (100k erase/write cycles), 5V tolerance for legacy automotive environments, integrated voltage monitoring (LVI), and availability of monitor ROM for in-system programming - all confirmed in Rev. 2 (2005) datasheet.

Technical Context

The MC908AZ32AMFUE implements the HCS08 CPU core with enhanced BDM debug interface and executes instructions at up to 20 MIPS. Its System Integration Module (SIM) manages reset sources, interrupt prioritization, and low-power modes (WAIT/STOP), while the Clock Generator Module (CGM) integrates a crystal oscillator and PLL for flexible clock synthesis from 1–8 MHz crystals to 40 MHz bus frequency.

Peripheral integration includes MSCAN08 - a full CAN 2.0A/B controller with 15 message buffers, programmable bit timing, and automatic retransmission - alongside dual 16-bit timer modules (TIMA/TIMB) supporting input capture, output compare, and PWM generation, plus a dedicated Programmable Interrupt Timer (PIT) for periodic wake-up events.

Key Specifications

Pinout & Package

MC908AZ32AMFUE is housed in a 64-pin QFP (Quad Flat Package) with 0.5 mm pitch, designated as MFUE per Freescale ordering nomenclature. The package supports surface-mount assembly and provides full I/O access including dedicated CAN Tx/Rx pins, analog supply/ground separation (VDDA/VSSA), and multiple 5V-tolerant port pins.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC908AZ32AMFUE, MC9S08DZ32F2 offers drop-in compatibility and improved robustness, while S9KEAZ32AMLC delivers architectural modernization at the cost of board-level redesign - making the former ideal for maintenance, the latter for strategic migration.

Availability

MC908AZ32AMFUE is available at Aetrix Electronics and suitable for automotive body electronics, industrial motor control panels, and off-highway equipment monitors requiring stable component supply and long-term lifecycle support.

Supply support for MC908AZ32AMFUE 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 specializing in secure connectivity solutions for automotive, industrial, and IoT applications, with deep heritage in microcontrollers dating back to Motorola and Freescale.

The MC908AZ32AMFUE belongs to the HCS08 family - designed specifically for cost-sensitive, real-time embedded systems in harsh environments where CAN communication, 5V operation, and field-programmable Flash are critical requirements.

FAQ

What is the maximum bus frequency supported by the MC908AZ32AMFUE?

The MC908AZ32AMFUE supports a maximum bus frequency of 40 MHz, achieved via its internal Phase-Locked Loop (PLL) clock generator that multiplies input crystal frequencies (1–8 MHz) to produce the high-speed system clock. This enables 20 MIPS execution performance and meets timing requirements for CAN bit rates up to 1 Mbps. The PLL configuration is controlled through CGM registers documented in Chapter 8 of the MC908AZ32AMFUE datasheet.

Does the MC908AZ32AMFUE include a built-in CAN controller?

Yes, the MC908AZ32AMFUE integrates the MSCAN08 controller - a fully compliant CAN 2.0A/B module supporting standard and extended frames, 15 message buffers, programmable bit timing, and automatic retransmission. It requires only an external CAN transceiver (e.g., MC33883 or TJA1042) for physical layer interfacing. This eliminates the need for discrete CAN protocol ICs in designs using MC908AZ32AMFUE.

How is flash programming performed on the MC908AZ32AMFUE?

Flash programming on the MC908AZ32AMFUE is supported via its on-chip Monitor ROM (MON), which provides a UART-based bootloader accessible through the SCI interface. Using standard terminal software and the MON command set, users can erase, program, and verify Flash memory without external programming hardware. This capability is enabled by default and documented in Chapter 12 of the MC908AZ32AMFUE datasheet.

What low-power modes does the MC908AZ32AMFUE support?

The MC908AZ32AMFUE supports WAIT and STOP low-power modes. In WAIT mode, the CPU halts while peripherals remain active; in STOP mode, nearly all clocks are disabled except for asynchronous wakeup sources like IRQ, RTC, or CAN activity. Both modes are entered via specific instructions (WAIT/STOP) and managed by SIM registers. Wake-up latency and current draw values are specified in Chapter 25 of the MC908AZ32AMFUE datasheet.

Is the MC908AZ32AMFUE pin-compatible with other HCS08 devices?

The MC908AZ32AMFUE is pin-compatible with the MC9S08DZ32F2 in the 64-pin QFP package (MFUE), sharing identical signal mapping and power pin locations. However, it is not pin-compatible with unrelated HCS08 variants such as MC9S08AC60 or MC9S08QG8. Pin compatibility with MC9S08DZ32F2 allows direct replacement in existing designs with firmware updates only - verified in Freescale's migration documentation for the MC908AZ32AMFUE.