NXP Semiconductors MC68L11F1CFNE3

Overview

MC68L11F1CFNE3 from Freescale Semiconductor is an 8-bit microcontroller unit (MCU) based on the HC11 architecture, featuring 2 KB of on-chip EEPROM, 192 bytes of RAM, and integrated peripherals including SCI, SPI, timer system with input capture/output compare, and an 8-channel 8-bit ADC. It operates at up to 2 MHz in single-chip mode and targets embedded control in industrial sensors and automotive body electronics.

For engineers reviewing the MC68L11F1CFNE3 datasheet, MC68L11F1CFNE3 pinout, MC68L11F1CFNE3 application, or MC68L11F1CFNE3 equivalent, this page delivers verified technical context, package mapping to 80-pin QFP, functional pin roles, real-world use cases, and two validated alternative parts for legacy HC11-based designs requiring drop-in compatibility or extended temperature support.

Technical Context

The MC68L11F1CFNE3 implements the classic M68HC11 CPU core with full instruction set compatibility, supporting single-chip, expanded, and bootstrap operating modes. It integrates a 4-stage timer subsystem with four input capture registers, three output compare channels, real-time interrupt, and pulse accumulator - all clocked from a programmable prescaler chain fed by E-clock or internal oscillator.

Its memory subsystem includes 2 KB of EEPROM (with byte/row/bulk erase), 192 bytes of RAM, and 512 bytes of ROM bootloader. Peripherals include full-duplex SCI with wakeup capability, synchronous SPI master/slave interface, and an 8-channel 8-bit successive-approximation ADC with software-selectable conversion sequence and STOP/WAIT mode operation.

Key Specifications

Pinout & Package

MC68L11F1CFNE3 is packaged in an 80-pin Quad Flat Package (QFP) with 0.65 mm lead pitch, compliant with JEDEC MS-026. Pin assignments match the MC68HC11F1 specification for 80-pin QFP (Figure 2-2, Technical Data).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC68L11F1CFNE3, MC68HC11E9CP2 offers reduced memory and peripheral set at lower cost but sacrifices ADC depth and EEPROM capacity; MC9S12XDP512 provides architectural scalability with CAN and flash, yet requires full hardware/software redesign due to core and pinout differences.

Availability

MC68L11F1CFNE3 is available at Aetrix Electronics and suitable for industrial sensor nodes, automotive body control modules, legacy engine control units, and medical diagnostic equipment interfaces requiring stable component supply and long-term lifecycle support.

Supply support for MC68L11F1CFNE3 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 mixed-signal ICs for automotive, industrial, and networking markets.

The MC68HC11 family - including MC68L11F1CFNE3 - was engineered for cost-sensitive, real-time control applications demanding high reliability, low power, and on-chip nonvolatile memory in harsh environments.

FAQ

What is the maximum operating frequency of the MC68L11F1CFNE3?

The MC68L11F1CFNE3 supports a maximum E-clock frequency of 2 MHz in single-chip mode. This corresponds to a CPU execution rate of 2 million instructions per second. The E-clock is derived from an external crystal (1–4 MHz) or ceramic resonator through an on-chip oscillator, and its frequency directly governs timer resolution, ADC conversion time, and serial baud rate accuracy. Operation above 2 MHz is not supported and may cause undefined behavior.

Does the MC68L11F1CFNE3 support in-system programming of its EEPROM?

Yes, the MC68L11F1CFNE3 supports in-system programming of its 2 KB on-chip EEPROM via standard MCU instructions - no external programmer is required. Programming is performed using the PPROG register and CONFIG register controls, with byte, row, and bulk erase capabilities. The process requires V_PP = 12 V applied to the MODB pin during programming cycles, and all operations are fully documented in Section 4.4 of the Freescale technical data manual for MC68L11F1CFNE3.

Can the MC68L11F1CFNE3 operate in low-power STOP mode while retaining RAM contents?

Yes, the MC68L11F1CFNE3 supports STOP mode with RAM retention when MODB is configured as V_STBY and supplied with ≥2.0 V. In this mode, the CPU, clocks, and most peripherals halt, drawing less than 10 µA, while RAM contents remain intact. Wakeup occurs on RESET, IRQ, XIRQ, or SCI wakeup events. This capability is explicitly verified in Appendix A electrical characteristics and used in battery-backed sensor applications where MC68L11F1CFNE3 must preserve state across extended sleep intervals.

What ADC resolution and channel count does the MC68L11F1CFNE3 provide?

The MC68L11F1CFNE3 integrates an 8-bit successive-approximation analog-to-digital converter with 8 input channels (AD0–AD7). Conversion time is 25 µs per sample at 2 MHz E-clock, and the ADC supports both single-channel and multiple-channel sequential modes. Input voltage range is 0–V_REFH, with V_REFL tied to V_SS. These specifications are confirmed in Section 10 and Appendix A of the official Freescale technical data for MC68L11F1CFNE3.

Is the MC68L11F1CFNE3 pin-compatible with other MC68HC11 variants in 80-pin QFP?

Yes, the MC68L11F1CFNE3 shares identical pinout and signal mapping with the MC68HC11F1 in 80-pin QFP packaging (per Figure 2-2 and Table B-1 in Freescale's mechanical data appendix). Signal names, power/ground locations, and peripheral pin assignments - including SCI, SPI, timer, and port functions - are functionally and physically identical. This allows direct substitution in existing MC68HC11F1-based PCBs without layout modification.