NXP Semiconductors MC908AP64ACFBER

Overview

MC908AP64ACFBER from Freescale Semiconductor is an 8-bit HCS08-core microcontroller with 64 KB on-chip Flash memory, 2 KB RAM, and integrated peripherals including SCI, SPI, I²C, ADC (8-channel, 10-bit), TIM, TBM, and COP watchdog. It operates at up to 20 MHz bus frequency and supports 5 V single-supply operation in industrial temperature range (–40°C to +85°C), targeting embedded control in motor drives and appliance subsystems.

For engineers reviewing the MC908AP64ACFBER datasheet, MC908AP64ACFBER pinout, MC908AP64ACFBER application, or MC908AP64ACFBER equivalent, key selection criteria include its 64-pin LQFP package, SuperFlash® endurance (100k erase/write cycles), internal PLL clock generation, low-power stop/wait modes, and factory-programmed monitor ROM for in-system programming.

Technical Context

The MC908AP64ACFBER implements the HCS08 CPU core with enhanced addressing modes and a 16-bit index register. Its Clock Generator Module (CGM) integrates a phase-locked loop (PLL) with programmable multipliers (×1 to ×32) and reference dividers, enabling precise bus clock synthesis from internal RC or external crystal sources.

System-level integration includes a System Integration Module (SIM) managing reset sources (POR, LVI, COP, illegal opcode), interrupt prioritization across 27 vectors, and power management with configurable wait/stop modes. The Analog-to-Digital Converter features sample-and-hold, software/triggered conversion, and programmable conversion time (16–32 µs per channel).

Key Specifications

Pinout & Package

MC908AP64ACFBER is housed in a 64-pin LQFP (10 mm × 10 mm, 0.5 mm pitch) package with exposed thermal pad. Pin assignments follow the MC68HC908AP A-family standard layout, supporting full signal access to all integrated peripherals.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC908AP32ACFBER, the MC908AP64ACFBER doubles Flash/RAM for feature-rich firmware and retains full peripheral compatibility; versus S9KEAZ128AMLH, it offers proven 5 V robustness and simpler tooling but lacks ARM ecosystem advantages and higher clock speeds.

Availability

MC908AP64ACFBER is available at Aetrix Electronics and suitable for industrial motor control, home appliance UI, sensor node, and power supervision applications requiring stable component supply and long-term manufacturing continuity.

Supply support for MC908AP64ACFBER 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) is a global leader in embedded processing solutions, specializing in automotive, industrial, and consumer microcontrollers.

The MC68HC908AP A-family, including MC908AP64ACFBER, was designed for cost-sensitive, 5 V industrial control applications requiring high noise immunity, integrated analog interfaces, and field-programmable Flash memory.

FAQ

What is the maximum operating frequency of the MC908AP64ACFBER?

The MC908AP64ACFBER supports a maximum bus frequency of 20 MHz, achieved via its integrated PLL clock generator. This frequency is derived from internal RC or external crystal sources (1–8 MHz), with programmable multiplication factors (×1 to ×32) and reference dividers. At 20 MHz, the HCS08 core executes instructions at approximately 10 million instructions per second (MIPS), enabling deterministic real-time response in motor control and sensor acquisition tasks. The MC908AP64ACFBER datasheet specifies timing parameters-including setup/hold times and ADC conversion latency-relative to this 20 MHz bus clock.

Does the MC908AP64ACFBER support in-system programming (ISP)?

Yes, the MC908AP64ACFBER supports in-system programming via its factory-programmed 1 KB Monitor ROM. This ROM implements a serial bootloader accessible through the SCI interface, allowing full Flash memory reprogramming without external hardware programmers. The process requires only a UART connection and compatible host software, and it preserves protected memory blocks during updates. The MC908AP64ACFBER's SuperFlash® technology ensures reliable erase/write cycles (100k minimum) and data retention (10 years) under industrial temperature conditions, making ISP viable for field firmware upgrades in deployed equipment.

What analog peripherals are integrated into the MC908AP64ACFBER?

The MC908AP64ACFBER integrates an 8-channel, 10-bit successive-approximation ADC with sample-and-hold circuitry and programmable conversion time (16–32 µs). Input channels map directly to Port C pins (AD0–AD7), supporting single-ended measurements referenced to internal or external VREFH/VREFL. No DAC or analog comparators are included. The ADC operates independently of CPU activity and supports software-triggered or periodic conversions synchronized to the TIM module. All analog functionality relies on dedicated VDDA/VSSA power pins for noise isolation, and the MC908AP64ACFBER datasheet specifies integral nonlinearity (INL) of ±1 LSB and differential nonlinearity (DNL) of ±0.5 LSB across the full operating range.

How does the Computer Operating Properly (COP) watchdog function on the MC908AP64ACFBER?

The COP watchdog in the MC908AP64ACFBER is a free-running 15-bit counter clocked by an independent RC oscillator, providing fail-safe recovery when application code hangs or enters infinite loops. It must be periodically cleared by writing specific values to the COPCTL register; failure to do so within the timeout window (configurable from 2 ms to 2 s) triggers a hardware reset. The MC908AP64ACFBER implements COP lock bits to prevent accidental disablement during runtime, and the reset vector points to the same location as POR/LVI resets, ensuring consistent initialization. Unlike windowed watchdogs, the MC908AP64ACFBER COP has no early-warning interrupt-only reset assertion-making it suitable for basic safety enforcement in non-safety-certified systems.

Is the MC908AP64ACFBER pin-compatible with other members of the AP-series family?

Yes, the MC908AP64ACFBER is pin-compatible with MC908AP32ACFBER, MC908AP16ACFBER, and MC908AP8ACFBER within the same 64-pin LQFP package variant. All share identical pin assignments, electrical characteristics, and peripheral mappings-including SCI, SPI, I²C, ADC, and TIM signal locations. Firmware developed for the MC908AP64ACFBER can run unmodified on lower-density variants, though Flash/RAM constraints may require code size optimization. This compatibility enables scalable design reuse across product tiers, where the MC908AP64ACFBER serves as the highest-capacity option in the family without requiring PCB redesign.