NXP Semiconductors MCF51AC128CCPUE

Overview

MCF51AC128CCPUE from NXP Semiconductors (formerly Freescale) is a 32-bit ColdFire V1 microcontroller designed for automotive and industrial control applications requiring CAN bus connectivity, analog signal acquisition, and deterministic real-time operation. It integrates 128 KB flash, 16 KB SRAM, a 12-bit 20-channel ADC, two analog comparators, dual SPI, dual SCI, I²C, FTM/TPM timers, and operates up to 50.33 MHz at 2.7–5.5 V.

For engineers reviewing the MCF51AC128CCPUE datasheet, MCF51AC128CCPUE pinout, MCF51AC128CCPUE application, or MCF51AC128CCPUE equivalent, key selection criteria include its 64-pin LQFP package, CAN protocol support (v2.0A/B), 16 KB RAM configuration, –40°C to +85°C temperature grade, and absence of CAN transceiver pins - requiring external physical layer implementation.

Technical Context

The MCF51AC128CCPUE implements the ColdFire V1 core with ISA_C instruction set, delivering 0.76 DMIPS/MHz when executing from flash memory. Its system integration module (SIM) manages clock distribution, reset sequencing, and peripheral enable/disable control across 69 GPIOs, including 16 Rapid GPIOs operating at CPU clock speed.

It features a multipurpose clock generator (MCG) supporting crystal oscillator (1–16 MHz), internal reference trimming (±2% deviation), FLL/PLL frequency multiplication, and independent low-power oscillator (LPO) for COP/RTI. The MSCAN module supports programmable bit rates up to 1 Mbps, five receive buffers with FIFO, three prioritized transmit buffers, and flexible identifier filtering (32-bit extended or 8-bit standard).

Key Specifications

Pinout & Package

64-pin LQFP package (10 mm × 10 mm, 0.5 mm pitch), RoHS-compliant, with exposed thermal pad (not electrically connected). Pin functions validated per Figure 3 and Table 4 of MCF51AC256 Rev.7 datasheet.

Key Features

Applications

Equivalent & Alternatives

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

Compared with S9KEAZ128AMLH and MPC5604B, the MCF51AC128CCPUE offers optimal balance of CAN integration, analog capability, and cost for non-safety body electronics - avoiding ARM licensing overhead while providing more ADC channels than MPC5604B at lower price point.

Availability

MCF51AC128CCPUE is available at Aetrix Electronics and suitable for automotive body control modules, industrial CAN gateways, smart sensor nodes, and motor control feedback units requiring stable component supply across long production lifecycles.

Supply support for MCF51AC128CCPUE 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 applications, with deep heritage in microcontroller innovation through its acquisition of Freescale.

The MCF51AC128CCPUE belongs to the ColdFire® microcontroller family, designed specifically for cost-sensitive, high-integration automotive body electronics and industrial control applications where CAN, analog front-end, and deterministic real-time performance are essential.

FAQ

Does the MCF51AC128CCPUE include an integrated CAN transceiver?

No, the MCF51AC128CCPUE contains only the MSCAN controller (protocol layer), not the physical layer transceiver. Pins PTA0 (TxCAN) and PTA1 (RxCAN) are logic-level outputs/inputs requiring connection to an external CAN transceiver such as the TJA1042 or SN65HVD230 to drive the differential CANH/CANL bus lines.

What is the maximum ADC sampling rate achievable with the MCF51AC128CCPUE?

The MCF51AC128CCPUE's 12-bit ADC supports up to 1.2 million samples per second (MSPS) in single-conversion mode with shortest acquisition time. Actual sustained throughput depends on clock configuration, channel count, and result format - e.g., 20-channel continuous scan at 12-bit resolution yields ~50 kSPS with default settings.

Can the MCF51AC128CCPUE operate without an external crystal?

Yes. The MCF51AC128CCPUE's multipurpose clock generator (MCG) supports internal reference clock (IRC) operation, allowing startup and full functionality without an external crystal. However, crystal-based modes (FBE/FEE) are required for precise timing applications like CAN communication, where ±0.5% clock accuracy is mandatory.

How many hardware breakpoints does the MCF51AC128CCPUE support via its BDM interface?

The MCF51AC128CCPUE provides six hardware breakpoints via its single-wire background debug module: four program counter (PC) breakpoints, one address-pair breakpoint, and one data breakpoint. These are configurable into 1- or 2-level triggers and support real-time trace buffer recording conditions.

Is the MCF51AC128CCPUE pin-compatible with other members of the MCF51AC128 family?

Yes, all 64-pin LQFP variants of the MCF51AC128 family - including MCF51AC128ACPUE (with CAN), MCF51AC128CCPUE (without CAN), and MCF51AC128CCFUE - share identical pinouts and mechanical footprint. Functional differences (e.g., CAN presence) are implemented internally; no PCB redesign is needed when migrating between them.