NXP Semiconductors MC68HC11A0CFNE3

Overview

MC68HC11A0CFNE3 from Freescale Semiconductor is an 8-bit HCMOS single-chip microcontroller featuring 512 bytes of on-chip EEPROM, 256 bytes of RAM, and a 10-bit analog-to-digital converter with 8 input channels. It integrates a serial communications interface (SCI), serial peripheral interface (SPI), programmable timer system, and real-time interrupt (RTI) - all operating at up to 2 MHz bus frequency. It is used in industrial control modules requiring deterministic I/O response and embedded sensor interfacing.

For engineers reviewing the MC68HC11A0CFNE3 datasheet, MC68HC11A0CFNE3 pinout, MC68HC11A0CFNE3 application, or MC68HC11A0CFNE3 equivalent, key selection criteria include EEPROM endurance (10,000 write/erase cycles), A/D conversion time (25 µs per channel), SCI baud rate support up to 19.2 kbps, and compatibility with single-chip and expanded multiplexed operating modes.

Technical Context

The MC68HC11A0CFNE3 implements a Harvard architecture with separate instruction and data buses, supporting both single-chip and expanded multiplexed memory configurations. Its CPU core executes instructions at 2 MHz maximum bus speed using a 6805-compatible instruction set extended with block move, bit manipulation, and indexed addressing enhancements.

On-chip peripherals include a 16-bit programmable timer with input capture and output compare functions, dual handshake-capable parallel I/O ports (Ports C and D), and a clock monitor circuit for fail-safe reset generation. The device supports WAIT and STOP low-power modes with wake-up via IRQ, XIRQ, RTI, or SCI activity.

Key Specifications

Pinout & Package

MC68HC11A0CFNE3 is housed in a 48-pin plastic dual in-line package (PDIP) with 0.6-inch body width and 0.1-inch pin pitch. Pin assignments follow Freescale's standard MC68HC11 pinout layout for 48-DIP configuration, supporting full parallel I/O port access and external memory expansion.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC68HC11A1CFNE3, the MC68HC11A0CFNE3 offers field-programmable EEPROM for runtime configuration storage, while MC68HC11E9CFN provides greater memory headroom and I/O scalability at the cost of pinout incompatibility.

Availability

MC68HC11A0CFNE3 is available at Aetrix Electronics and suitable for industrial automation, automotive body electronics, and smart sensor transmitter designs requiring stable component supply and long-term lifecycle support.

Supply support for MC68HC11A0CFNE3 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

Freescale Semiconductor (now part of NXP Semiconductors) is a fabless semiconductor company specializing in embedded processing, analog, and connectivity solutions for automotive, industrial, and consumer markets.

The MC68HC11A0CFNE3 belongs to the classic M68HC11 microcontroller family designed for deterministic real-time control in resource-constrained embedded systems where reliability and code density are critical.

FAQ

What is the maximum bus frequency supported by the MC68HC11A0CFNE3?

The MC68HC11A0CFNE3 operates with a maximum bus frequency of 2 MHz. This defines the upper limit for instruction execution speed and peripheral timing, such as A/D conversion rate and SCI baud generation. The device achieves this using an internal divide-by-two clock generator from the crystal input, allowing use of a 4 MHz crystal while maintaining 2 MHz bus timing. All timing specifications in the datasheet assume operation at this rated frequency.

Does the MC68HC11A0CFNE3 support in-system programming of its EEPROM?

Yes, the MC68HC11A0CFNE3 supports full in-system programming of its 512-byte EEPROM via standard on-chip control registers (PPROG, CONFIG). No external high-voltage programmer is required - writes and erases are executed under firmware control using the internal charge pump. Each byte can be individually erased and rewritten up to 10,000 times, making it suitable for storing calibration data or user settings across power cycles.

How many analog input channels does the MC68HC11A0CFNE3 A/D converter support?

The MC68HC11A0CFNE3 features a 10-bit successive-approximation A/D converter with 8 multiplexed analog input channels (AN0–AN7), selectable via the ADCTL register. Conversion time is fixed at 25 µs per channel, and the module supports single-channel or multiple-channel scan modes. Reference voltages (VRL and VRH) are externally configurable, enabling flexible input range adaptation from 0–VDD to custom differential ranges.

Can the MC68HC11A0CFNE3 operate in low-power modes, and how is wake-up handled?

Yes, the MC68HC11A0CFNE3 supports WAIT and STOP low-power modes. In WAIT mode, the CPU halts but clocks remain active for peripherals; wake-up occurs on any interrupt. In STOP mode, all clocks stop except for the real-time interrupt (RTI) counter; wake-up is triggered by IRQ, XIRQ, RTI timeout, or SCI receive activity. Both modes preserve register and RAM contents, enabling rapid resumption of operation with sub-millisecond latency.

What packaging and temperature grade is the MC68HC11A0CFNE3 supplied in?

The MC68HC11A0CFNE3 is supplied in a 48-pin plastic dual in-line package (PDIP) with "FNE3" suffix indicating commercial temperature range (0°C to +70°C) and lead-free finish. The package conforms to JEDEC MS-001 standard with 0.6-inch body width and 0.1-inch pin spacing, ensuring compatibility with legacy through-hole PCB layouts and socket-based development systems.