NXP Semiconductors MCHC912B32MFUE8

Overview

MCHC912B32MFUE8 from NXP Semiconductors (formerly Freescale) is a 16-bit HCS12 microcontroller featuring 32 KB on-chip Flash EEPROM, 1 KB RAM, and integrated CAN 2.0A/B controller, PWM, ATD converter, and BDM debug interface. It operates at up to 8 MHz bus frequency, supports single-chip and expanded modes, and targets automotive body control, industrial sensor nodes, and embedded motor control systems.

For engineers reviewing the MCHC912B32MFUE8 datasheet, MCHC912B32MFUE8 pinout, MCHC912B32MFUE8 application, or MCHC912B32MFUE8 equivalent, this page delivers verified technical context, package mapping, functional pin definitions, real-world use cases, and validated alternative options - all grounded in the official M68HC12B Family Data Sheet, Rev. 9.1.

Technical Context

The MCHC912B32MFUE8 implements the HCS12 CPU core with 16-bit data path, 24-bit addressing, and enhanced instruction set including bit manipulation and loop control. Its memory subsystem includes 32 KB Flash (erase/program via on-chip controller), 1 KB SRAM, and optional 512-byte EEPROM (not present in this variant).

Peripheral integration includes an 8-channel 10-bit ATD converter with configurable sample time, a 6-channel PWM module with independent period/duty registers, dual SCI interfaces, and a fully compliant msCAN12 controller supporting both standard and extended frames with programmable acceptance filtering.

Key Specifications

Pinout & Package

Package: 80-pin Quad Flat Package (QFP), lead-free, RoHS-compliant, 14 × 14 mm body, 0.65 mm pitch.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCHC912B32MFUE8, MC9S12XDP512 offers scalable memory and modern peripherals but requires PCB redesign; S912ZVMC64F0MLFR adds safety certification and integrated power management at higher cost and complexity - both serve distinct evolution paths rather than drop-in replacements.

Availability

MCHC912B32MFUE8 is available at Aetrix Electronics and suitable for automotive body electronics, industrial motor control, and medical device subsystems requiring stable component supply across extended production lifecycles.

Supply support for MCHC912B32MFUE8 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 company specializing in secure connectivity solutions for automotive, industrial, and IoT applications, with roots in Freescale's microcontroller heritage.

The MCHC912B32MFUE8 belongs to the legacy HCS12 family, designed specifically for cost-sensitive, real-time embedded control in harsh environments where CAN communication, deterministic timing, and field-programmable Flash are essential.

FAQ

What is the maximum operating frequency of the MCHC912B32MFUE8?

The MCHC912B32MFUE8 supports a maximum bus frequency of 8 MHz, derived from its internal PLL clock generation module. This frequency governs instruction execution speed, peripheral timing (e.g., ATD sampling rate, PWM resolution), and CAN bit timing accuracy. The core runs at the same bus frequency, with no separate CPU clock domain.

Does the MCHC912B32MFUE8 include on-chip EEPROM memory?

No, the MCHC912B32MFUE8 does not integrate EEPROM. While some variants in the M68HC12B family (e.g., MC68HC912BC32) include 512 bytes of EEPROM, the MCHC912B32MFUE8 relies solely on its 32 KB Flash for non-volatile storage and 1 KB SRAM for runtime data - confirmed in Section 1.5 (Ordering Information) and Chapter 7 of the M68HC12B Family Data Sheet, Rev. 9.1.

How is debug functionality implemented on the MCHC912B32MFUE8?

Debug is implemented via the Background Debug Mode (BDM) interface using the BKGD pin. This single-wire serial protocol enables full in-circuit debugging - including breakpoints, register read/write, memory inspection, and Flash programming - without halting real-time peripheral operation. The MCHC912B32MFUE8 requires a compatible BDM pod (e.g., P&E Micro BDM12) and no JTAG header.

What are the key differences between the msCAN12 module and basic CAN controllers?

The msCAN12 module in the MCHC912B32MFUE8 provides full CAN 2.0A/B compliance with 15 dedicated message buffers, programmable ID acceptance filtering, automatic retransmission, and error confinement. Unlike basic CAN peripherals, it offloads message handling from the CPU and supports time-triggered communication via the Real-Time Interrupt (RTI) module - critical for deterministic automotive networks.

Can the MCHC912B32MFUE8 operate in low-power modes, and how are they entered?

Yes, the MCHC912B32MFUE8 supports Stop and Wait modes. Stop mode disables the oscillator and most clocks, reducing current to ~10 µA; it is entered by writing to the STOP instruction or via COP timeout. Wait mode gates the bus clock while preserving register contents and allowing wake-up from interrupts - activated using the WAIT instruction. Both modes are detailed in Chapter 5 of the datasheet.