NXP Semiconductors MCHC11F1CFNE3

Overview

MCHC11F1CFNE3 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 a 10-bit ADC with 8 channels, dual serial interfaces (SCI and SPI), and a 16-bit timer system with input capture and output compare. It is used in industrial control panels requiring deterministic real-time I/O handling.

For engineers reviewing the MCHC11F1CFNE3 datasheet, MCHC11F1CFNE3 pinout, MCHC11F1CFNE3 application, or MCHC11F1CFNE3 equivalent, key selection considerations include its 68-pin PLCC package, 2 MHz maximum bus frequency, EEPROM endurance (10k write/erase cycles), SCI baud rate generation accuracy, and compatibility with legacy HC11 development toolchains.

Technical Context

The MCHC11F1CFNE3 implements the classic MC68HC11 architecture with Harvard-style memory mapping, supporting both single-chip mode (on-chip ROM/EEPROM/RAM active) and expanded mode (external memory interface enabled). Its CPU executes instructions at up to 2 MHz bus speed using a 4-phase E-clock derived from internal or external crystal sources.

It integrates a full-featured 16-bit timer subsystem with four input capture registers, five output compare channels, real-time interrupt (RTI), pulse accumulator, and COP watchdog. The analog subsystem includes a successive-approximation 10-bit ADC with programmable conversion sequence and sample-and-hold control.

Key Specifications

Pinout & Package

68-pin PLCC (Plastic Leaded Chip Carrier) package with 27.9 mm × 27.9 mm body size and 1.27 mm lead pitch. Pin 1 marked by corner notch; leads arranged in square perimeter configuration.

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 MCHC11F1CFNE3 offers unique value in legacy industrial systems where PLCC packaging, integrated EEPROM, and exact HC11 binary compatibility are mandatory - neither alternative replicates its 2 KB on-chip EEPROM in a 68-pin footprint with identical instruction timing.

Availability

MCHC11F1CFNE3 is available at Aetrix Electronics and suitable for industrial motor control, building automation sensor hubs, and legacy automotive body controllers requiring stable component supply and long-term obsolescence management.

Supply support for MCHC11F1CFNE3 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 was originally developed by Motorola (later Freescale, then NXP) to provide cost-effective, robust 8-bit control for automotive and industrial applications where deterministic real-time behavior and on-chip nonvolatile storage were critical.

FAQ

What is the maximum operating frequency of the MCHC11F1CFNE3?

The MCHC11F1CFNE3 operates with a maximum bus frequency of 2 MHz, derived from an internal 4-phase E-clock generated by its on-chip oscillator circuit. This frequency governs instruction execution timing, peripheral clocking, and I/O response latency. External crystal frequencies between 1 MHz and 4 MHz are supported, and the E-clock is synchronized to ensure stable operation across temperature and voltage variations. The MCHC11F1CFNE3 does not support overclocking beyond this specification.

Does the MCHC11F1CFNE3 include on-chip EEPROM, and what is its endurance?

Yes, the MCHC11F1CFNE3 integrates 2 KB of on-chip EEPROM rated for 10,000 write/erase cycles with guaranteed 10-year data retention at 85°C. This EEPROM is mapped into the memory space at addresses $E000–$E7FF and supports byte-level programming and sector erase. It is commonly used to store calibration data, device configuration, and runtime parameters without requiring external nonvolatile memory. The MCHC11F1CFNE3 EEPROM is accessed via dedicated control registers and requires specific timing sequences defined in the Freescale technical data manual.

What serial communication interfaces are available on the MCHC11F1CFNE3?

The MCHC11F1CFNE3 features two independent serial interfaces: one asynchronous Serial Communications Interface (SCI) compatible with RS-232/RS-485 levels (with external transceivers), and one synchronous Serial Peripheral Interface (SPI) supporting master/slave operation. The SCI supports programmable baud rates, framing options, and wakeup capabilities; the SPI supports clock polarity and phase configuration (CPOL/CPHA) and operates up to half the E-clock frequency. Both interfaces are accessible through dedicated pins on the 68-pin PLCC package and controlled via separate register sets in the MCHC11F1CFNE3 memory map.

How does the MCHC11F1CFNE3 handle power management and low-power modes?

The MCHC11F1CFNE3 supports two low-power modes: WAIT and STOP. In WAIT mode, the CPU halts while peripherals (timer, SCI, SPI) remain active; wake-up occurs on interrupt or reset. In STOP mode, the entire system clock is gated except for the COP watchdog and optional RAM retention (enabled via MODB/V_STBY). Power consumption drops to ~10 µA typical in STOP mode. The MCHC11F1CFNE3 exits STOP mode only via RESET, IRQ, or XIRQ - no peripheral interrupts wake it directly. These modes are configured via the STOP and WAI instructions and require proper initialization of the OPTION and CONFIG registers before entry.

Is the MCHC11F1CFNE3 pin-compatible with other MC68HC11 variants?

The MCHC11F1CFNE3 uses a 68-pin PLCC package with pin assignments matching the MC68HC11F1 specification, as documented in Freescale's mechanical data appendix. It is pin-compatible with other MC68HC11F1 variants in the same PLCC package (e.g., MCHC11F1CFNE2), but not with QFP or PGA versions like the MC68HC11F1MFA or MC68HC11E9CP2. Key signals such as E, 4XOUT, XTAL/EXTAL, and port mappings are consistent across PLCC-packaged F1 devices. Always verify mechanical drawings and pin function tables from the official NXP datasheet before board reuse.