NXP Semiconductors MC68HC11E0CFNE3R

Overview

MC68HC11E0CFNE3R from NXP (formerly Freescale) is an 8-bit microcontroller in the M68HC11E family, featuring 512 bytes of on-chip RAM, 256 bytes of EEPROM, and 12 KB of EPROM. It integrates a 16-bit timer system with input capture/output compare, 8-channel 8-bit ADC, dual serial interfaces (SCI and SPI), and operates at up to 2 MHz bus frequency. It targets legacy industrial control and automotive subsystems requiring deterministic real-time response.

For engineers reviewing the MC68HC11E0CFNE3R datasheet, MC68HC11E0CFNE3R pinout, MC68HC11E0CFNE3R application, or MC68HC11E0CFNE3R equivalent, key selection criteria include EPROM programmability, on-chip EEPROM retention, single-chip mode operation, and compatibility with HC11 development tools such as EVBU and PCbug11.

Technical Context

The MC68HC11E0CFNE3R implements the Motorola 68HC11 CPU core with Harvard architecture memory mapping, supporting both single-chip and expanded bus modes. Its internal clock generation uses an external crystal (1–4 MHz) or ceramic resonator, producing a 2 MHz E-clock via on-chip divide-by-two logic.

It features a configurable 16-bit timer subsystem with four input capture channels and five output compare channels, plus real-time interrupt (RTI) capability. The analog subsystem includes an 8-channel, 8-bit successive-approximation ADC with software-selectable conversion time (8–16 µs).

Key Specifications

Pinout & Package

MC68HC11E0CFNE3R is housed in a 48-pin Plastic Leaded Chip Carrier (PLCC-48) package with J-lead configuration, designed for surface-mount assembly and socket-compatible prototyping. Pinout conforms to standard M68HC11E series layout per Rev. 5.1 datasheet Section 1.4.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC68HC11E9CP and MC68HC11A8CP, the MC68HC11E0CFNE3R uniquely combines field-programmable EPROM, integrated EEPROM for runtime data, and full HC11 instruction set compatibility-making it the only option among the three supporting in-system firmware updates without external hardware.

Availability

MC68HC11E0CFNE3R is available at Aetrix Electronics and suitable for industrial motor control, legacy automotive subsystems, HVAC management, and medical device monitoring requiring stable component supply and long-term obsolescence mitigation.

Supply support for MC68HC11E0CFNE3R 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 and embedded processing.

The M68HC11E family was developed by Motorola (acquired by Freescale, then NXP) to deliver cost-effective, radiation-tolerant 8-bit control for automotive and industrial applications where deterministic timing and field programmability were essential.

FAQ

What is the maximum operating frequency of the MC68HC11E0CFNE3R?

The MC68HC11E0CFNE3R supports a maximum bus frequency of 2 MHz, derived from an external 4 MHz crystal or resonator via internal divide-by-two logic. This defines the upper limit for instruction execution speed and peripheral timing accuracy. The E-clock output reflects this 2 MHz rate and is used for synchronizing external logic or debugging tools. Operation above 2 MHz violates AC timing specifications and may cause undefined behavior.

Does the MC68HC11E0CFNE3R support in-system programming of its EPROM?

Yes, the MC68HC11E0CFNE3R supports in-system EPROM programming via the VPPE/XIRQ pin using a high-voltage (12 V) pulse sequence. This capability allows firmware updates without removing the device from the board. Programming requires adherence to the timing and voltage sequences defined in Section 2.4 of the Rev. 5.1 datasheet and is typically performed using tools like PCbug11 and the M68HC11EVBU. The MC68HC11E0CFNE3R must be in bootstrap mode for successful EPROM write cycles.

What packaging and lead finish does the MC68HC11E0CFNE3R use?

The MC68HC11E0CFNE3R is supplied in a 48-pin Plastic Leaded Chip Carrier (PLCC-48) package with J-type leads and a matte tin (Sn) lead finish compliant with RoHS Directive 2011/65/EU. The PLCC-48 footprint matches industry-standard sockets and reflow profiles for leaded packages. Pin 1 is marked with a corner notch, and the package body material is UL94V-0 rated flame-retardant plastic.

Can the MC68HC11E0CFNE3R operate from a 3.3 V supply?

No, the MC68HC11E0CFNE3R is specified only for 5.0 V ±10% operation (4.5 V to 5.5 V). It lacks internal voltage regulation or level-shifting circuitry for 3.3 V logic compatibility. Attempting to power the MC68HC11E0CFNE3R from 3.3 V will result in improper CPU operation, failed memory access, and unreliable peripheral function. External level shifters are required when interfacing with 3.3 V devices.

How is the EEPROM memory in the MC68HC11E0CFNE3R protected against accidental writes?

The MC68HC11E0CFNE3R EEPROM is protected by a dedicated Block Protect Register (BPR) that disables write/erase operations to selected 16-byte blocks when set. Protection is enforced at the hardware level-no software bypass exists. To modify protected blocks, the BPR must first be cleared via a specific 6-byte command sequence issued through the EEPROM programming interface. This prevents unintended corruption during normal program execution or interrupt service routines.