NXP Semiconductors MCF51AC128CCFUE

Overview

MCF51AC128CCFUE from NXP Semiconductors (formerly Freescale) is a 32-bit ColdFire V1 microcontroller designed for industrial control and automotive subsystems. It integrates 128 KB flash, 16 KB SRAM, dual analog comparators, 20-channel 12-bit ADC, two SPI interfaces (one with FIFO), two SCIs, FTM/TPM timers, CRC engine, and I²C - all operating up to 50.33 MHz at 2.7–5.5 V. It targets CAN-free embedded applications requiring deterministic real-time response and low-power operation.

For engineers reviewing the MCF51AC128CCFUE datasheet, MCF51AC128CCFUE pinout, MCF51AC128CCFUE application, or MCF51AC128CCFUE equivalent, key selection considerations include its 64-pin QFP package, absence of CAN peripheral, 16 KB RAM configuration, -40°C to +85°C temperature grade, and compatibility with ColdFire V1 toolchains and BDM debug infrastructure.

Technical Context

The MCF51AC128CCFUE implements the ColdFire V1 core (ISA_C revision) with background debug module (BDM) and real-time trace via VBUS. Its memory subsystem includes 128 KB on-chip flash with block protection and 16 KB SRAM - distinct from 32 KB variants in the same family.

Peripherals are organized around a system integration module (SIM) with clock gating, interrupt controller (CF1_INTC) supporting 40 I/O interrupts, and multipurpose clock generator (MCG) with FLL/PLL, crystal oscillator (XTAL/EXTAL), and LPO for COP/RTI. The device lacks CAN but retains full MSCAN-compatible register mapping except for transmit/receive buffers and identifier filters.

Key Specifications

Pinout & Package

Package: 64-pin QFP (14 mm × 14 mm), lead-free, RoHS-compliant, rated for –40°C to +85°C ambient operation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with Kinetis KE02Z64VQH2, MCF51AC128CCFUE offers superior real-time determinism via ColdFire V1's fixed-latency pipeline and richer timer/PWM capabilities; compared with MCF51JM128VLF, it trades CAN functionality for cost and thermal margin optimization in CAN-free deployments.

Availability

MCF51AC128CCFUE is available at Aetrix Electronics and suitable for industrial motor control, automotive body electronics, medical infusion pumps, and smart energy metering requiring stable component supply across extended product lifecycles.

Supply support for MCF51AC128CCFUE 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 delivering secure, connected, and intelligent solutions for automotive, industrial, IoT, mobile, and communication infrastructure markets.

The MCF51AC128CCFUE belongs to NXP's ColdFire microcontroller product line, engineered for deterministic real-time performance in cost-sensitive industrial and automotive subsystems where CAN is not required but high peripheral integration and debug visibility are critical.

FAQ

What is the maximum operating frequency of the MCF51AC128CCFUE?

The MCF51AC128CCFUE operates at up to 50.33 MHz across its full 2.7–5.5 V supply range and –40°C to +85°C temperature grade. This frequency is achievable using the MCG's FLL or PLL modes with an external crystal or internal reference, and is validated per Freescale's DC and AC characteristics specifications in Rev.7 datasheet Section 2.11.

Does the MCF51AC128CCFUE include a CAN controller?

No, the MCF51AC128CCFUE does not include a CAN controller. The "C" in the part number suffix indicates the CAN-disabled variant (per Table 3, Orderable Part Number Summary). Pins PTA0 (TxCAN) and PTA1 (RxCAN) are unconnected in this version, and associated MSCAN registers are not implemented - confirmed by device comparison Table 1 and functional unit listing in Section 1.3.1.

How much SRAM does the MCF51AC128CCFUE have, and is it configurable?

The MCF51AC128CCFUE contains 16 KB of on-chip static RAM (SRAM), as specified in Table 1 (Device Comparison) and Section 1.3.1. This value is fixed and not user-configurable; it differs from the 32 KB SRAM found in CAN-enabled MCF51AC128A variants. The SRAM is mapped into the ColdFire address space starting at 0x2000_0000 and supports byte/word/long-word access.

What debug interface does the MCF51AC128CCFUE support?

The MCF51AC128CCFUE supports a single-wire Background Debug Module (BDM) interface via the BKGD/MS pin. This provides non-intrusive debugging, flash programming, real-time trace via VBUS, and six hardware breakpoints - all documented in Sections 1.3.1 and 6.1 of the Rev.7 datasheet. No JTAG or SWD interface is present.

Which package type and pin count does the MCF51AC128CCFUE use?

The MCF51AC128CCFUE uses a 64-pin QFP package (14 mm × 14 mm), as explicitly stated in Table 3 (Orderable Part Number Summary) and Figure 3 (64-Pin QFP/LQFP pinout). This is electrically and mechanically identical to the 64-pin LQFP variant but differs from the 80-pin LQFP and 44-pin LQFP options available in the same family.