NXP Semiconductors MC908AP32CFAE-NXP

Overview

MC908AP32CFAE from NXP (formerly Freescale) is an 8-bit HCS08 microcontroller featuring 32 KB on-chip Flash memory, 1 KB RAM, and a 20 MHz CPU clock. It integrates a 10-bit ADC with 8 channels, SCI, SPI, I²C, and a programmable 16-bit TIM module. Designed for cost-sensitive industrial control and appliance applications requiring deterministic real-time response and low-power operation.

For engineers reviewing the MC908AP32CFAE datasheet, MC908AP32CFAE pinout, MC908AP32CFAE application, or MC908AP32CFAE equivalent, this page delivers verified electrical specs, validated pin functions, confirmed peripheral compatibility, and direct alternative part guidance for legacy HCS08 migration paths.

Technical Context

The MC908AP32CFAE implements the HCS08 core with enhanced interrupt handling, including priority-based vectoring and 16-level stack depth. Its System Integration Module (SIM) provides centralized reset management, low-voltage inhibit (LVI), and COP watchdog with configurable timeout.

It supports multiple clock sources: internal RC oscillator (1–8 MHz), external crystal (up to 20 MHz), and PLL-based frequency multiplication. The CGM enables dynamic bus clock scaling between 1 MHz and 20 MHz, while the ADC operates with programmable sample time and conversion trigger sources including TIM overflow and external pins.

Key Specifications

Pinout & Package

MC908AP32CFAE is housed in a 64-pin LQFP package (10 × 10 mm, 0.5 mm pitch) with exposed thermal pad. Pin assignments follow the standard HCS08 AP-family layout defined in Rev. 3 datasheet Section 1.4.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC908AP32CFAE, MC9S08AC32CFUE offers backward-compatible peripherals and added USB, while S9KEAZN32ACLH delivers 3× Dhrystone MIPS at same power but demands firmware rearchitecture and minor board revision.

Availability

MC908AP32CFAE is available at Aetrix Electronics and suitable for industrial motor control, home appliance UI, smart power metering, and factory automation sensor nodes requiring stable component supply across long-lifecycle programs.

Supply support for MC908AP32CFAE 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 HCS08 architecture.

The MC908AP32CFAE belongs to the HCS08 AP-family, engineered for deterministic real-time control in cost-constrained embedded systems where reliability, low power, and field-programmability are critical.

FAQ

What is the maximum operating frequency of the MC908AP32CFAE?

The MC908AP32CFAE supports a maximum bus clock frequency of 20 MHz, achievable via internal PLL multiplication of the crystal or RC oscillator source. This frequency governs instruction execution speed, peripheral timing, and ADC sampling rate - all verified in the Rev. 3 datasheet Section 22.5 under DC Electrical Characteristics.

Does the MC908AP32CFAE support in-system programming (ISP)?

Yes, the MC908AP32CFAE includes a 2 KB on-chip monitor ROM that enables full in-system programming via its SCI interface. This allows field firmware updates without removing the device, using standard UART commands documented in Chapter 8 of the MC68HC908AP A-Family Data Sheet, Rev. 3.

What are the low-power modes supported by the MC908AP32CFAE?

The MC908AP32CFAE supports two hardware low-power modes: Wait Mode (CPU halted, peripherals active, wake-up on IRQ/KBI/SCI) and Stop Mode (all clocks stopped except LVI and reset logic, wake-up only on IRQ or RESET). Both are detailed in Sections 4.5 and 7.6 of the official datasheet.

Can the MC908AP32CFAE ADC operate independently of the CPU?

Yes, the MC908AP32CFAE ADC can be triggered autonomously by TIM overflow, external pin events, or software command - and conversions generate interrupts upon completion. This allows background data acquisition without CPU polling, as specified in Chapter 15 of the Rev. 3 datasheet.

Is the MC908AP32CFAE pin-compatible with other AP-family members like MC68HC908AP64A?

No - while the MC908AP32CFAE shares the same 64-pin LQFP package and core peripheral set with MC68HC908AP64A, pin functions differ in memory-mapped I/O assignments (e.g., PTC4–PTC7 usage) and CONFIG register defaults. Direct substitution requires validation per Section 1.5 (Pin Functions) of the datasheet.