NXP Semiconductors MC68HC11E1CFNE2R

Overview

MC68HC11E1CFNE2R from Freescale Semiconductor is an 8-bit microcontroller in the M68HC11E family, featuring 512 bytes of on-chip RAM, 12 KB of EPROM, and integrated peripherals including a 8-channel 8-bit ADC, SCI, SPI, and a 16-bit timer system. It operates at up to 2 MHz internal bus speed and supports single-chip mode for embedded control in automotive sensors and industrial motor controllers.

For engineers reviewing the MC68HC11E1CFNE2R datasheet, MC68HC11E1CFNE2R pinout, MC68HC11E1CFNE2R application, or MC68HC11E1CFNE2R equivalent, key selection criteria include EPROM programmability, on-chip ADC resolution and channel count, SCI/SPI interface compatibility, and availability in 52-pin PLCC package with 3.0–5.5 V operation.

Technical Context

The MC68HC11E1CFNE2R implements the M68HC11 CPU core with Harvard architecture, supporting indexed, extended, and inherent addressing modes. Its memory map includes 12 KB EPROM (user-programmable), 512-byte RAM, and 256-byte EEPROM for configuration storage.

Peripheral integration includes an 8-channel 8-bit successive-approximation ADC with software-selectable conversion time, full-duplex asynchronous SCI with idle-line and address-mark wakeup, and synchronous SPI master/slave interface with programmable clock polarity and phase. The 16-bit timer subsystem provides input capture, output compare, and real-time interrupt capabilities.

Key Specifications

Pinout & Package

MC68HC11E1CFNE2R is housed in a 52-pin Plastic Leaded Chip Carrier (PLCC) package with J-lead geometry, designed for surface-mount reflow assembly and socket-compatible prototyping. Thermal resistance θ_JA is 50°C/W.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC68HC11E1CFNE2R, the MC68HC11E9CP trades EPROM capacity for higher EEPROM endurance and lower cost, while the MC68HC11F1CFN adds DAC functionality and larger memory at the expense of increased power consumption and price.

Availability

MC68HC11E1CFNE2R is available at Aetrix Electronics and suitable for automotive engine control units, industrial motor drives, medical infusion pumps, and building automation sensor nodes requiring stable component supply and long-term obsolescence support.

Supply support for MC68HC11E1CFNE2R 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, analog, and connectivity solutions for automotive, industrial, and consumer markets.

The M68HC11E family was engineered for cost-sensitive, real-time control applications demanding integrated peripherals, nonvolatile program storage, and low-power operation in harsh environments.

FAQ

What is the maximum operating frequency of the MC68HC11E1CFNE2R?

The MC68HC11E1CFNE2R supports a maximum E-clock frequency of 2 MHz, derived from an external crystal (1–4 MHz) or oscillator. This corresponds to a 2 MHz internal bus speed, enabling instruction execution at approximately 0.5–1.0 MIPS depending on opcode complexity and addressing mode. The device does not support internal PLL multiplication.

Does the MC68HC11E1CFNE2R include on-chip EEPROM?

Yes, the MC68HC11E1CFNE2R includes 256 bytes of on-chip EEPROM used exclusively for storing the CONFIG register and security settings. It does not provide general-purpose EEPROM data storage; user data must be held in RAM or external memory. The CONFIG register controls boot mode, COP timeout, and memory protection flags.

How is firmware programmed into the MC68HC11E1CFNE2R EPROM?

Firmware is programmed into the 12 KB on-chip EPROM of the MC68HC11E1CFNE2R using bootstrap mode via the SCI interface. A host PC sends binary data using Freescale's BUFFALO monitor or compatible tools; the device executes internal programming algorithms with VPP = 12 V applied to the MODB pin. No UV erasure is required, but EPROM cells have finite write endurance (~100 cycles).

What low-power modes does the MC68HC11E1CFNE2R support?

The MC68HC11E1CFNE2R supports Wait and Stop modes. In Wait mode, the CPU halts but clocks remain active for peripheral operation (e.g., SCI receive). In Stop mode, all clocks stop except the real-time interrupt (RTI) counter, reducing current draw to <10 µA. Wakeup occurs via IRQ, XIRQ, RTI, or SCI activity - critical for battery-powered applications.

Is the MC68HC11E1CFNE2R pin-compatible with other M68HC11E variants?

Yes, the MC68HC11E1CFNE2R is pin-compatible with other 52-pin PLCC variants in the M68HC11E family, including MC68HC11E9CP and MC68HC11F1CFN. Pin assignments for VDD/VSS, XTAL/EXTAL, E, RESET, IRQ/XIRQ, and all Port A–E signals are identical. Differences lie in internal memory configuration and peripheral enablement, not pinout.