NXP Semiconductors MC68HC11K0CFNE3

Overview

MC68HC11K0CFNE3 from Freescale Semiconductor is an 8-bit HCMOS microcontroller unit (MCU) featuring 512 bytes of on-chip EEPROM, 512 bytes of RAM, and 24 KB of ROM. It integrates a 16-bit timer subsystem with input capture, output compare, pulse accumulator, and real-time interrupt capabilities, plus an 8-channel 8-bit analog-to-digital converter. It is used in automotive engine control modules for sensor signal conditioning and closed-loop timing-critical actuator management.

For engineers reviewing the MC68HC11K0CFNE3 datasheet, MC68HC11K0CFNE3 pinout, MC68HC11K0CFNE3 application, or MC68HC11K0CFNE3 equivalent, key selection considerations include its 84-pin PLCC package, single-chip mode operation, COP watchdog timer, SCI/SPI serial interfaces, and EEPROM retention over 10 years at 85°C.

Technical Context

The MC68HC11K0CFNE3 implements the M68HC11 CPU core with full instruction set compatibility to the Motorola 6800 architecture. It operates in single-chip mode by default, executing code from internal ROM and supporting in-system EEPROM programming via the bootstrap monitor.

Its timing system includes four independent 16-bit timer channels, programmable PWM outputs, and configurable A/D conversion triggered by timer events or software. The device supports both crystal (1–8 MHz) and external clock inputs, with E-clock output synchronized to internal bus timing.

Key Specifications

Pinout & Package

MC68HC11K0CFNE3 is housed in an 84-pin Plastic-Leaded Chip Carrier (PLCC) per Motorola case 780 mechanical specification, with 0.050″ lead pitch and JEDEC-standard footprint.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC68HC11E9CP, MC68HC11K0CFNE3 adds integrated 8-bit ADC and full timer subsystem for sensor-based control; compared with MC912B32CFUE8, it offers proven field reliability in legacy automotive platforms but lacks Flash reprogrammability and CAN controller.

Availability

MC68HC11K0CFNE3 is available at Aetrix Electronics and suitable for automotive engine management systems, industrial motor controllers, medical infusion devices, and instrumentation requiring stable component supply across extended product lifecycles.

Supply support for MC68HC11K0CFNE3 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) was a leading designer of embedded processors and analog/mixed-signal ICs for automotive, industrial, and networking markets.

The MC68HC11K0CFNE3 belongs to the M68HC11K family, engineered for deterministic real-time control in harsh environments where EEPROM-based configuration persistence and COP watchdog integrity are essential.

FAQ

What is the maximum operating frequency of the MC68HC11K0CFNE3?

The MC68HC11K0CFNE3 supports a maximum crystal frequency of 8 MHz, yielding a 2 MHz E-clock output (½ CPU frequency). Its internal bus operates at 2 MHz, with instruction execution times ranging from 2 to 12 bus cycles depending on addressing mode and opcode - enabling deterministic timing for engine control loops with worst-case latency under 6 µs per instruction.

Does the MC68HC11K0CFNE3 include a built-in analog-to-digital converter?

Yes, the MC68HC11K0CFNE3 integrates an 8-channel 8-bit successive-approximation analog-to-digital converter (ADC) with programmable conversion speed and sample-and-hold capability. Channels PA0–PA7 serve as analog inputs, and conversion results are stored in dedicated 8-bit result registers accessible via memory-mapped I/O - eliminating need for external ADC in basic sensor interface applications.

How is in-system programming performed on the MC68HC11K0CFNE3 EEPROM?

In-system programming of the MC68HC11K0CFNE3 EEPROM is enabled by its resident 512-byte bootstrap monitor ROM. Using the SCI interface and standard serial terminal commands, users can download and execute programming routines that erase and write EEPROM locations without removing the device from the circuit - supporting field calibration updates and firmware patching.

What packaging and pin count does the MC68HC11K0CFNE3 use?

The MC68HC11K0CFNE3 uses an 84-pin Plastic-Leaded Chip Carrier (PLCC) package conforming to Motorola case number 780. This square, surface-mountable package features J-leads with 0.050″ pitch and is designed for socket-based prototyping and high-reliability automotive PCB assembly with thermal performance validated to −40°C to +125°C ambient.

Is the MC68HC11K0CFNE3 compatible with the M68HC11 instruction set architecture?

Yes, the MC68HC11K0CFNE3 implements the full M68HC11 instruction set architecture, maintaining binary compatibility with earlier members like the MC68HC11A8 and MC68HC11E9. All addressing modes - including inherent, immediate, direct, extended, indexed, and relative - are supported, ensuring legacy assembly code and C compiler toolchains remain functional without modification.