NXP Semiconductors MC908AB32CFUE

Overview

MC908AB32CFUE from NXP (formerly Freescale) is an 8-bit HCS08 microcontroller featuring 32 KB on-chip FLASH, 1 KB RAM, and 512 B EEPROM. It integrates dual 16-bit timer modules (TIMA/TIMB), a 10-bit 8-channel ADC, SCI and SPI serial interfaces, and a PLL-based clock generator supporting up to 8 MHz bus frequency. It targets low-cost industrial control and sensor interface applications requiring deterministic real-time response.

For engineers reviewing the MC908AB32CFUE datasheet, MC908AB32CFUE pinout, MC908AB32CFUE application, or MC908AB32CFUE equivalent, this page delivers verified technical context, package mapping, functional pin roles, key timing and memory parameters, and validated alternative options for legacy design continuity and supply assurance.

Technical Context

The MC908AB32CFUE implements the HCS08 CPU core with enhanced addressing modes and a 16-bit index register, executing instructions at up to 8 MHz bus speed via its integrated PLL-based Clock Generator Module (CGM). Its System Integration Module (SIM) provides centralized reset management, low-power mode control (Wait/Stop), and interrupt vectoring across 27 hardware interrupt sources.

Memory architecture includes 32 KB of user-programmable FLASH with block protection, 1 KB of SRAM, and 512 B of EEPROM with configurable security and write-cycle endurance. Analog subsystem comprises a 10-bit successive-approximation ADC with programmable sample time, reference selection (VREFH/VSS), and channel scan capability.

Key Specifications

Pinout & Package

MC908AB32CFUE is housed in a 64-pin QFP (Quad Flat Package) with 0.5 mm pitch, compliant with JEDEC MS-026. The package supports surface-mount assembly and thermal dissipation up to 1.2 W under typical industrial ambient conditions.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 8-bit microcontroller applications.

Compared with MC908AB32CFUE, MC9S08AC128CFUE offers scalable memory and pin-compatible upgrade path within the same architecture, while S9KEAZ128AMLH represents a generational shift to ARM with expanded peripherals but no binary compatibility.

Availability

MC908AB32CFUE is available at Aetrix Electronics and suitable for industrial motor control, smart sensor node, and home appliance UI applications requiring stable component supply and long-term obsolescence management.

Supply support for MC908AB32CFUE 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, with roots in Freescale's microcontroller heritage.

The MC908AB32CFUE belongs to the HCS08 family, designed specifically for cost-sensitive, real-time embedded control applications where deterministic timing, low power, and integrated analog peripherals are essential.

FAQ

What is the maximum operating frequency of the MC908AB32CFUE?

The MC908AB32CFUE supports a maximum bus frequency of 8 MHz, achieved via its internal Phase-Locked Loop (PLL) circuit which multiplies a 1–8 MHz crystal or external clock input. This frequency governs instruction execution, peripheral timing, and ADC conversion rates. The PLL allows stable high-speed operation without requiring a high-frequency crystal, reducing system cost and EMI.

Does the MC908AB32CFUE include a hardware watchdog timer?

Yes, the MC908AB32CFUE includes a Computer Operating Properly (COP) watchdog timer with configurable timeout periods (from 1.8 ms to 2.3 s) and an independent RC oscillator clock source. The COP can be disabled via software after reset, and its status is monitored by the SIM Reset Status Register. This feature ensures safe recovery from software faults in the MC908AB32CFUE-based system.

How many analog-to-digital converter (ADC) channels does the MC908AB32CFUE support?

The MC908AB32CFUE integrates a 10-bit successive-approximation ADC with eight input channels (ATD0–ATD7), mapped to Port B pins PTB0–PTB7. It supports single-ended or differential conversions, programmable sample time, and selectable voltage references (VREFH/VSS or internal bandgap). Conversion results are stored in the 16-bit ADC Data Register (ADR).

Can the MC908AB32CFUE be programmed in-circuit without a dedicated programmer?

Yes, the MC908AB32CFUE contains a 2 KB Monitor ROM (MON) that enables in-system programming (ISP) via its SCI interface. Using standard UART commands and a host PC or terminal, users can erase, program, and verify FLASH and EEPROM memory without external hardware programmers-ideal for field updates and low-volume development of the MC908AB32CFUE.

What low-power modes are supported by the MC908AB32CFUE?

The MC908AB32CFUE supports two primary low-power modes: Wait Mode (CPU halted, peripherals active, wake-up via IRQ/KBI/SCI) and Stop Mode (all clocks stopped except LVI and optional RTC, wake-up via IRQ/KBI/RST). Stop mode current is typically less than 1 µA, making the MC908AB32CFUE suitable for battery-operated applications requiring extended sleep duration.