NXP Semiconductors MCHC11F1CFNE5

Overview

MCHC11F1CFNE5 from NXP Semiconductors (formerly Freescale) is an 8-bit microcontroller unit (MCU) featuring a MC68HC11 CPU core, 512 bytes of on-chip RAM, 2 KB of EEPROM, and 12 KB of ROM. It supports single-chip and expanded operating modes, includes integrated SPI, SCI, timer subsystems, and a 8-channel 8-bit ADC. It is used in industrial control panels requiring deterministic real-time I/O handling and firmware-upgradable logic.

For engineers reviewing the MCHC11F1CFNE5 datasheet, MCHC11F1CFNE5 pinout, MCHC11F1CFNE5 application, or MCHC11F1CFNE5 equivalent, key selection criteria include its 68-pin PLCC package, 2 MHz maximum bus frequency, on-chip EEPROM retention without external backup, and support for WAIT/STOP low-power modes in embedded sensor interface designs.

Technical Context

The MCHC11F1CFNE5 implements the classic MC68HC11 architecture with full instruction set compatibility, including indexed, extended, and relative addressing modes. It integrates a 16-bit timer system with input capture, output compare, pulse accumulator, and real-time interrupt functions - all clocked from the internal E-clock derived from crystal or external oscillator inputs.

Its memory subsystem includes 12 KB of mask-programmed ROM (bootloader + monitor), 512 bytes of static RAM, and 2 KB of electrically erasable programmable EEPROM organized in 64-byte blocks. The CONFIG register enables write protection and boot-mode configuration, while the OPTION register controls COP watchdog timeout and clock monitor behavior.

Key Specifications

Pinout & Package

Package: 68-pin PLCC (Plastic Leaded Chip Carrier), JEDEC MS-026AC compliant, body size 24.2 mm × 24.2 mm, lead pitch 1.27 mm.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 8-bit microcontroller applications.

Compared with MC68HC11E9CP2 and MC9S12XDP512, the MCHC11F1CFNE5 offers minimal-footprint, EEPROM-based field update capability in a mature 68-pin PLCC package - ideal for cost-sensitive, space-constrained legacy industrial upgrades where pin compatibility and proven reliability outweigh raw performance needs.

Availability

MCHC11F1CFNE5 is available at Aetrix Electronics and suitable for industrial PLC I/O modules, automotive body controllers, medical infusion pump logic boards, and energy meter communication interfaces requiring stable component supply and long-term lifecycle support.

Supply support for MCHC11F1CFNE5 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 formed from the spin-off of Philips' semiconductor division, now specializing in secure connectivity solutions for automotive, industrial, and IoT markets.

The MC68HC11 family - including the MCHC11F1CFNE5 - was originally developed by Motorola and later maintained by Freescale and NXP to serve cost-sensitive, real-time embedded control applications with deterministic timing, on-chip nonvolatile storage, and robust I/O flexibility.

FAQ

What is the maximum operating frequency of the MCHC11F1CFNE5?

The MCHC11F1CFNE5 operates with a maximum bus frequency of 2 MHz, derived from its internal E-clock generator. This frequency is fixed by the internal clock divider and crystal/oscillator input - it does not support dynamic frequency scaling. All timing-critical peripherals (timer, SCI, SPI) are synchronized to this E-clock, and timing margins must be validated per application using the official Freescale/NXP timing diagrams in Appendix A.

Does the MCHC11F1CFNE5 support in-system programming (ISP)?

Yes, the MCHC11F1CFNE5 supports in-system programming via its on-chip bootstrap monitor ROM. When configured in special bootstrap mode using MODA/MODB pins, the MCHC11F1CFNE5 enters a serial programming mode accessible through the SCI interface. This allows field updates of the 2 KB EEPROM without removing the device from the PCB - provided the host system implements the required command protocol defined in the MC68HC11F1 Technical Data manual.

What are the power supply requirements for the MCHC11F1CFNE5?

The MCHC11F1CFNE5 requires a single 5 V ±10% DC supply applied to V_DD pins, with dedicated V_SS ground connections. It draws approximately 25 mA typical in active mode at 2 MHz and drops to ~50 µA in STOP mode with clocks disabled. Decoupling capacitors (0.1 µF ceramic + 4.7 µF tantalum) are required per Freescale layout guidelines to ensure stable operation under transient load conditions.

Can the MCHC11F1CFNE5 operate without an external crystal?

Yes, the MCHC11F1CFNE5 can operate using an external TTL-level clock signal applied to the EXTAL pin instead of a crystal. In this configuration, XTAL is left unconnected, and the internal oscillator circuit is bypassed. The external clock must meet specified voltage levels, rise/fall times, and jitter limits per Appendix A - and must be stable within ±1% to maintain reliable timer and serial communication timing.

How is the 2 KB EEPROM organized and protected in the MCHC11F1CFNE5?

The 2 KB EEPROM in the MCHC11F1CFNE5 is organized into thirty-two 64-byte blocks, each individually erasable. Protection is enforced via the Block Protect Register (BPROT) and CONFIG register settings - once locked, write/erase operations require a specific unlock sequence. The EEPROM retains data for ≥10 years at 85°C and supports ≥100,000 write/erase cycles per block, as verified in Freescale's qualification testing and documented in the MC68HC11F1 datasheet revision history.