NXP Semiconductors MC68HC11E1CFNE3R

Overview

MC68HC11E1CFNE3R from NXP (formerly Freescale) is an 8-bit CISC 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 16-bit timer system. It operates at up to 2 MHz bus speed with single-chip mode execution and supports automotive and industrial control applications requiring deterministic real-time response.

For engineers reviewing the MC68HC11E1CFNE3R datasheet, MC68HC11E1CFNE3R pinout, MC68HC11E1CFNE3R application, or MC68HC11E1CFNE3R equivalent, key selection criteria include EPROM-based firmware persistence, on-chip A/D conversion for sensor interfacing, serial communication support for diagnostics, and compatibility with legacy HC11 development tools and bootstrap programming.

Technical Context

The MC68HC11E1CFNE3R implements a Harvard-architecture CPU core with 64 KB address space, supporting direct, indexed, extended, and inherent addressing modes. Its memory map includes configurable RAM/IO mapping and dedicated EPROM/EEPROM blocks for program storage and configuration data.

Peripherals are tightly coupled to the CPU via internal buses: the 8-channel ADC uses a shared sample-and-hold with programmable conversion sequence; the SCI supports full-duplex asynchronous communication with idle-line and address-mark wakeup; the SPI operates in master/slave mode with programmable clock polarity and phase; and the 16-bit timer subsystem provides input capture, output compare, and real-time interrupt functions.

Key Specifications

Pinout & Package

MC68HC11E1CFNE3R is housed in a 52-pin Plastic Leaded Chip Carrier (PLCC) package with J-lead terminations, designed for surface-mount assembly and socket-compatible prototyping. The package supports thermal dissipation up to 1.2 W under specified ambient conditions and meets JEDEC MO-047AB mechanical standards.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC68HC11E1CFNE3R, MC68HC11A8CP offers reduced memory and no security features but maintains full software and hardware compatibility, while MC912B32CPVE delivers modern CAN-enabled functionality at the cost of complete architectural incompatibility and redesign effort.

Availability

MC68HC11E1CFNE3R is available at Aetrix Electronics and suitable for automotive engine control, industrial motor drives, medical infusion pumps, and building HVAC sensor nodes requiring stable component supply and long-term obsolescence management.

Supply support for MC68HC11E1CFNE3R 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-effective, deterministic real-time control in resource-constrained embedded systems where reliability, low power, and field-programmability are critical design requirements.

FAQ

What is the maximum bus frequency supported by the MC68HC11E1CFNE3R?

The MC68HC11E1CFNE3R supports a maximum bus frequency of 2 MHz, derived from an external crystal or clock source applied to the XTAL/EXTAL pins. This frequency determines instruction execution speed, peripheral timing, and ADC conversion rate - all synchronized to the E-clock output, which runs at half the bus frequency. The device is fully characterized for operation across its specified voltage and temperature range at this speed.

Does the MC68HC11E1CFNE3R include on-chip EEPROM memory?

No, the MC68HC11E1CFNE3R does not include on-chip EEPROM. It contains 12 KB of EPROM for program storage and 512 bytes of RAM for data, but no electrically erasable non-volatile memory. Configuration data must be stored in EPROM or external EEPROM. The related MC68HC11E20 variant adds EEPROM, but MC68HC11E1CFNE3R relies solely on EPROM for persistent code storage.

Can the MC68HC11E1CFNE3R be programmed in-system without an external programmer?

Yes, the MC68HC11E1CFNE3R supports in-system programming via its built-in bootstrap loader. When held in bootstrap mode (MODA=LOW, MODB=HIGH at reset), it executes ROM-resident code that accepts Intel Hex or S-record files over the SCI interface. This allows firmware updates using only a UART connection and terminal software - no external EPROM programmer is required for field deployment or debugging.

What is the purpose of the VRH and VRL pins on the MC68HC11E1CFNE3R?

The VRH (Port D7) and VRL (Port D6) pins on the MC68HC11E1CFNE3R provide the high and low reference voltages for the on-chip 8-bit ADC. These pins allow external precision references to be applied, enabling accurate analog measurements independent of VDD fluctuations. When left unconnected, the ADC defaults to using VDD and VSS as references, limiting measurement accuracy to the power supply's tolerance and noise profile.

Is the MC68HC11E1CFNE3R pin-compatible with other members of the M68HC11E family?

Yes, the MC68HC11E1CFNE3R is pin-compatible with other 52-pin PLCC variants in the M68HC11E family, including the MC68HC11E20 and MC68HC11E9. All share identical pin assignments for power, clocks, interrupts, I/O ports, and peripheral signals. However, differences in on-chip memory size, security features, and ADC resolution mean firmware and system-level validation are still required when substituting across variants.