NXP Semiconductors MC908AS60ACFU

Overview

MC908AS60ACFU from NXP (formerly Freescale) is an 8-bit HCS08 microcontroller featuring 60 KB on-chip FLASH, 2 KB RAM, and integrated CAN 2.0A/B controller, ADC with 12-channel 10-bit resolution, and dual EEPROM blocks (512 B + 512 B). It operates at up to 40 MHz bus frequency with internal PLL clock generation and supports automotive body control modules.

For engineers reviewing the MC908AS60ACFU datasheet, MC908AS60ACFU pinout, MC908AS60ACFU application, or MC908AS60ACFU equivalent, key selection criteria include CAN interface support, dual EEPROM for data logging redundancy, FLASH-1/FLASH-2 partitioning for firmware/data separation, and CGM PLL lock time under 100 µs in automotive cold-start conditions.

Technical Context

The MC908AS60ACFU implements the HCS08 CPU core with enhanced addressing modes and a 16-bit index register. Its System Integration Module (SIM) integrates reset supervision, COP watchdog, LVI voltage monitoring, and interrupt vector management across 32 priority levels.

The Clock Generator Module (CGM) combines crystal oscillator input (OSC1/OSC2), PLL with programmable bandwidth, and base clock selector to deliver stable bus clocks from 1–40 MHz. Dual FLASH banks (FLASH-1: 56 KB code, FLASH-2: 4 KB data) enable safe over-the-air updates without runtime corruption.

Key Specifications

Pinout & Package

MC908AS60ACFU is housed in a 64-pin QFP (Quad Flat Package) with 0.5 mm pitch, thermally enhanced for automotive thermal cycling reliability.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC908AS60ACFU, MC9S08DZ60 offers lower BOM cost but sacrifices EEPROM flexibility, while S9KEAZN64 delivers greater processing headroom at the expense of added component count and layout complexity for CAN integration.

Availability

MC908AS60ACFU is available at Aetrix Electronics and suitable for automotive body control, engine sensor interface, instrument cluster, and electric power steering applications requiring stable component supply, long-term lifecycle assurance, and AEC-Q100 Grade 1 qualification.

Supply support for MC908AS60ACFU 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 markets.

The MC908AS60ACFU belongs to the legacy HCS08 microcontroller family designed specifically for cost-optimized, high-reliability automotive subsystems requiring CAN, robust EEPROM, and extended temperature operation.

FAQ

What is the maximum operating frequency of the MC908AS60ACFU bus clock?

The MC908AS60ACFU supports a maximum bus clock frequency of 40 MHz, achieved via its integrated Clock Generator Module (CGM) PLL using an external 4–8 MHz crystal. This frequency is fully supported across the full –40°C to +125°C temperature range and 2.7–5.5 V supply voltage, making it suitable for demanding automotive timing applications. The PLL lock time is specified at <100 µs under nominal conditions.

Does the MC908AS60ACFU include hardware CAN support?

Yes, the MC908AS60ACFU integrates the MSCAN08 controller, which implements the full CAN 2.0A/B protocol specification. It includes 32 message buffers, programmable acceptance filtering, automatic retransmission, and error confinement logic - all without CPU intervention. This hardware CAN peripheral is pin-compatible with other HCS08 CAN devices and requires only an external ISO 11898-compliant transceiver.

How is EEPROM organized in the MC908AS60ACFU?

The MC908AS60ACFU features two physically independent EEPROM blocks: EEPROM-1 (512 bytes) and EEPROM-2 (512 bytes). Each block has its own control registers, timebase dividers, and block protection bits. This architecture allows concurrent read/write operations, separate endurance tracking, and distinct failure modes - critical for automotive applications requiring redundant data storage such as odometer logs and calibration parameters.

What low-power modes does the MC908AS60ACFU support?

The MC908AS60ACFU supports WAIT and STOP low-power modes. In WAIT mode, the CPU halts while peripherals (including ADC, timers, and CAN) remain active. In STOP mode, the entire system clock is gated except for the LVI and COP modules, reducing current consumption to <10 µA. Both modes retain RAM and register contents, and STOP mode exit is triggered by external interrupt, reset, or COP timeout.

Is the MC908AS60ACFU pin-compatible with other HCS08 devices?

The MC908AS60ACFU uses a 64-pin QFP package with a defined pinout documented in Section 1.4 of the official datasheet. While it shares the same package footprint with MC68HC908AZ60A and MC68HC908AS60E, functional pin assignments differ - particularly for CAN, BDLC, and ADC channels. Therefore, it is not pin-compatible with those variants without board-level redesign. Always verify pin mapping against the MC908AS60ACFU-specific datasheet revision.