NXP Semiconductors MC68L11E1CFNE2

Overview

MC68L11E1CFNE2 from NXP (formerly Freescale) is an 8-bit CMOS microcontroller in the M68HC11E family, featuring 512 bytes of on-chip RAM, 2 KB of EPROM, 256 bytes of EEPROM, and integrated A/D converter, SCI, SPI, and timer subsystems. It operates at up to 2 MHz bus frequency, supports single-chip and expanded modes, and targets embedded control in industrial sensors and automotive subsystems.

For engineers reviewing the MC68L11E1CFNE2 datasheet, MC68L11E1CFNE2 pinout, MC68L11E1CFNE2 application, or MC68L11E1CFNE2 equivalent, key selection criteria include its 40-pin DIP package, 3.0–5.5 V extended voltage operation, EPROM programmability, on-chip EEPROM retention, and compatibility with HC11 development tools including EVBU and PCbug11.

Technical Context

The MC68L11E1CFNE2 implements the M68HC11 CPU core with 16-bit address bus and 8-bit data bus, supporting indexed, direct, extended, and inherent addressing modes. Its memory map includes 2 KB EPROM (user-programmable), 256-byte EEPROM (100K erase/write cycles), and 512-byte RAM - all mapped into a unified 64 KB address space.

Peripherals include an 8-channel 8-bit A/D converter with software-selectable conversion time, full-duplex SCI with idle-line and address-mark wakeup, master/slave SPI interface, and a 16-bit timer system with input capture, output compare, and real-time interrupt capabilities - all controlled via dedicated memory-mapped registers.

Key Specifications

Pinout & Package

MC68L11E1CFNE2 uses a 40-pin plastic DIP (Dual In-line Package) with 0.6-inch body width and 0.1-inch pin pitch. Pin numbering follows standard DIP convention, with Pin 1 at bottom-left corner when notch faces upward.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC68L11E1CFNE2, the MC68HC11E9CP sacrifices EPROM and EEPROM capacity for lower cost and simpler memory mapping, while the MC9RS08KA2CSC offers modern flash efficiency and lower active current but abandons HC11 binary compatibility and integrated analog functions.

Availability

MC68L11E1CFNE2 is available at Aetrix Electronics and suitable for industrial sensor nodes, automotive body controllers, legacy equipment retrofits, and educational lab platforms requiring stable component supply and long-term obsolescence management.

Supply support for MC68L11E1CFNE2 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, specializing in secure connectivity solutions for automotive, industrial, and IoT markets.

The M68HC11E family was designed for cost-sensitive, resource-constrained embedded control applications requiring high reliability, on-chip nonvolatile memory, and broad peripheral integration - especially in environments with wide supply voltage ranges and legacy design constraints.

FAQ

What is the maximum bus frequency supported by the MC68L11E1CFNE2?

The MC68L11E1CFNE2 supports a maximum bus frequency of 2 MHz, derived from the external crystal or clock source via internal divide-by-two logic. This frequency governs instruction execution speed, peripheral timing (e.g., SCI baud rate generation), and A/D conversion clocking. Operation above 2 MHz is not guaranteed and may cause timing violations in memory or peripheral access.

Does the MC68L11E1CFNE2 include on-chip EEPROM, and what is its endurance rating?

Yes, the MC68L11E1CFNE2 integrates 256 bytes of EEPROM rated for ≥100,000 erase/write cycles. This memory retains data without power and is used for storing calibration values, device configuration, or runtime parameters. The EEPROM is accessed via memory-mapped registers and supports byte, row, and bulk erase operations under software control.

Can the MC68L11E1CFNE2 operate from a 3.3 V supply, and is it 5 V tolerant?

Yes, the MC68L11E1CFNE2 is specified for 3.0–5.5 V operation, making it fully compatible with 3.3 V systems. All I/O pins are 5 V tolerant when VDD = 3.3 V, allowing safe interfacing with 5 V peripherals without external level shifters - a key advantage in mixed-voltage industrial designs.

How is EPROM programming performed on the MC68L11E1CFNE2?

EPROM programming on the MC68L11E1CFNE2 requires applying VPP (~12 V) to the XIRQ/VPPE pin while asserting XIRQ and executing the on-chip programming algorithm. Programming is done byte-by-byte or via downloaded data using tools like PCbug11 and the M68HC11EVBU. The EPROM is one-time programmable and cannot be erased electrically.

Is the MC68L11E1CFNE2 pin-compatible with other M68HC11E family members in 40-pin DIP packages?

Yes, the MC68L11E1CFNE2 shares identical pinout and electrical characteristics with other 40-pin DIP variants in the M68HC11E family (e.g., MC68HC11E9CP, MC68HC11E20CP), enabling direct substitution where memory configuration and voltage range requirements align. Always verify EPROM/EEPROM size and operating voltage specs before replacement.