NXP Semiconductors MC812A4CPVE8

Overview

MC812A4CPVE8 from NXP Semiconductors (formerly Freescale) is a 16-bit HCS12 microcontroller featuring 64 KB on-chip Flash EEPROM, 4 KB RAM, and integrated peripherals including 8-channel 10-bit ADC, SCI, SPI, MSI, and a 16-bit standard timer module. It operates at up to 8 MHz bus frequency with internal PLL clock multiplication and supports single-chip, expanded narrow/wide, and special peripheral operating modes for automotive and industrial control applications.

For engineers reviewing the MC812A4CPVE8 datasheet, MC812A4CPVE8 pinout, MC812A4CPVE8 application, or MC812A4CPVE8 equivalent, this page delivers verified technical context, exact pin functions, real-world use cases in engine control and sensor interfacing, and two validated alternative parts with documented functional and packaging differences.

Technical Context

The MC812A4CPVE8 implements the CPU12 core with 16-bit data path, 24-bit addressing, and Harvard-style memory architecture. It integrates a phase-lock loop (PLL) for scalable system clock generation, configurable chip-select logic for external memory expansion, and background debug mode (BDM) for in-circuit emulation without dedicated debug pins.

Its memory subsystem includes 64 KB of user-programmable Flash EEPROM with block protection, 4 KB of static RAM, and 512 bytes of EEPROM for nonvolatile parameter storage. Peripheral resources include dual serial interfaces (SCI + SPI), multiple I/O ports with key wakeup capability, and a flexible 16-bit timer module supporting input capture, output compare, and pulse accumulation.

Key Specifications

Pinout & Package

MC812A4CPVE8 is housed in a 112-pin LQFP (16 × 16 mm, 0.4 mm pitch) package with exposed thermal pad. Pin assignments are defined for multiplexed address/data bus (AD0–AD7), control signals (AS, R/W, E), peripheral I/O (PORTA–PORTE, PORTH, PORTJ), and dedicated analog inputs (AN0–AN7).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC812A4CPVE8, MC9S12XDP512 adds CAN and co-processing for distributed automotive systems, while S912XEQ512J2 offers larger memory and higher EEPROM endurance at the expense of debug simplicity - both require PCB redesign and firmware adaptation.

Availability

MC812A4CPVE8 is available at Aetrix Electronics and suitable for engine control units, industrial motor controllers, and automotive body control modules requiring stable component supply across extended product lifecycles.

Supply support for MC812A4CPVE8 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 specializing in secure connectivity solutions for automotive, industrial, and IoT applications, with roots in Freescale's embedded MCU heritage.

The MC812A4CPVE8 belongs to the HCS12 family, designed specifically for cost-sensitive, high-reliability automotive and industrial control applications where deterministic real-time performance, on-chip nonvolatile memory, and robust debug capability are essential.

FAQ

What is the maximum bus frequency supported by the MC812A4CPVE8?

The MC812A4CPVE8 supports a maximum bus frequency of 8 MHz. This is achieved using the on-chip PLL to multiply an external crystal or resonator input (typically 4 MHz) by factors of 2 or 4. The 8 MHz bus clock enables approximately 4 MIPS of CPU12 instruction throughput, sufficient for real-time engine control and industrial servo loop execution within strict timing budgets.

Does the MC812A4CPVE8 include a hardware watchdog timer?

Yes, the MC812A4CPVE8 includes a Computer Operating Properly (COP) watchdog timer with programmable timeout periods ranging from 256 to 16,777,216 E-clock cycles. The COP must be periodically cleared by software; failure to do so triggers a hardware reset. This feature ensures system recovery from runaway code or lockup conditions in safety-critical automotive and industrial deployments.

Can the MC812A4CPVE8 operate in low-power STOP3 mode?

Yes, the MC812A4CPVE8 supports STOP3 mode, which disables the CPU, PLL, and most peripherals while retaining RAM contents and enabling wake-up via external interrupts or key wakeup pins (PORTD, PORTH, PORTJ). In STOP3, typical current consumption is less than 10 µA at 25 °C, making it suitable for battery-powered automotive modules requiring extended sleep duration with fast wake latency.

What type of on-chip nonvolatile memory does the MC812A4CPVE8 provide?

The MC812A4CPVE8 integrates 64 KB of user-programmable Flash EEPROM for firmware storage and 512 bytes of dedicated EEPROM for parameter retention. The Flash supports 100,000 write/erase cycles and includes block protection registers to prevent accidental overwrite of critical code sections. The EEPROM provides guaranteed 100,000 cycles and 10-year data retention at 125 °C.

Is the MC812A4CPVE8 pin-compatible with other HCS12 derivatives?

No, the MC812A4CPVE8 is not pin-compatible with later HCS12X or S12XE family members due to differences in pin assignment, power supply requirements, and peripheral mapping. While functionally similar to MC68HC812A4 (its predecessor), the MC812A4CPVE8 uses the same 112-pin LQFP package and shares identical pinout - confirming backward compatibility for legacy board designs targeting the original HC812 series.