NXP Semiconductors MC68HC711E9CFNE3

Overview

MC68HC711E9CFNE3 from NXP (formerly Freescale) is an 8-bit CMOS microcontroller in the M68HC11E family, featuring 512 bytes of on-chip RAM, 12 KB EPROM, 256 bytes EEPROM, 8-channel 8-bit ADC, two 16-bit timer modules, SCI and SPI serial interfaces, and a 40-pin ceramic DIP package. It operates at up to 3 MHz bus speed and supports single-chip and expanded modes for embedded control in industrial instrumentation and automotive subsystems.

For engineers reviewing the MC68HC711E9CFNE3 datasheet, MC68HC711E9CFNE3 pinout, MC68HC711E9CFNE3 application, or MC68HC711E9CFNE3 equivalent, key selection considerations include EPROM programmability, on-chip EEPROM security features, analog input channel count, SCI/SPI peripheral availability, and compatibility with legacy HC11 development tools like EVBU and PCbug11.

Technical Context

The MC68HC711E9CFNE3 implements the M68HC11 CPU core with full instruction set compatibility, including indexed, extended, and relative addressing modes. Its memory architecture integrates 12 KB of one-time-programmable EPROM, 256 bytes of EEPROM with block protection, and 512 bytes of static RAM - all mapped into a unified 64 KB address space.

Peripheral subsystems include a 16-bit timer system with four input capture and five output compare channels, an 8-channel 8-bit successive-approximation ADC with programmable conversion sequence, and full-duplex asynchronous SCI plus synchronous SPI - all controlled via dedicated memory-mapped registers and interrupt vectors aligned with the HC11 vector table.

Key Specifications

Pinout & Package

MC68HC711E9CFNE3 is housed in a 40-pin ceramic dual in-line package (CERDIP) with 0.6-inch body width, through-hole mounting, and industry-standard pin spacing. The package provides full access to parallel I/O ports (A–E), serial interfaces (SCI/SPI), reset and interrupt lines, clock inputs (XTAL/EXTAL), and power/ground terminals.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC68HC11E20CP and MC68HC11A8CP, the MC68HC711E9CFNE3 uniquely combines field-programmable EPROM, secure EEPROM storage, and VPPE-enabled in-circuit programming - making it the only option among the three supporting post-manufacture firmware updates and calibrated parameter retention.

Availability

MC68HC711E9CFNE3 is available at Aetrix Electronics and suitable for industrial sensor interface, automotive body control, and legacy equipment retrofit requiring stable component supply and long-term obsolescence management.

Supply support for MC68HC711E9CFNE3 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 leader delivering secure, energy-efficient, and scalable solutions for automotive, industrial, and IoT applications.

The MC68HC711E9CFNE3 belongs to the M68HC11E family - designed specifically for cost-sensitive, low-power embedded control systems requiring integrated analog peripherals, field-upgradable firmware, and robust industrial temperature operation.

FAQ

What is the maximum operating frequency of the MC68HC711E9CFNE3?

The MC68HC711E9CFNE3 supports a maximum E-clock frequency of 3 MHz, derived from an external crystal or clock source applied to the XTAL/EXTAL pins. This corresponds to a maximum 6 MHz crystal frequency, as the internal phase-locked loop divides the crystal input by two to generate the E-clock used by the CPU and peripherals. Operation above this limit risks timing violations and undefined behavior.

Does the MC68HC711E9CFNE3 support in-system programming of its EPROM?

Yes, the MC68HC711E9CFNE3 supports in-system EPROM programming via bootstrap mode using the XIRQ/VPPE pin to apply 12.5 V programming voltage. This capability enables field firmware updates without removing the device from the board. Programming requires compatible tools such as the M68HC11EVBU evaluation board and PCbug11 software, as documented in Freescale application notes AN1060 and EB296.

How does the EEPROM security feature work on the MC68HC711E9CFNE3?

The MC68HC711E9CFNE3 implements EEPROM security through the CONFIG register, which can be permanently locked to prevent readout of EEPROM contents. Once secured, the device blocks external access to EEPROM data while preserving full functional operation. Security activation requires a specific sequence involving the SCCR2 register and VPPE voltage, as detailed in application note EB184 - ensuring protection against reverse engineering in deployed systems.

Can the MC68HC711E9CFNE3 operate in expanded bus mode?

Yes, the MC68HC711E9CFNE3 supports expanded bus mode using PORT D (data) and PORT E (address/control) to interface with external memory and peripherals. In this mode, the device generates AS, R/W, STRA, and STRB strobes synchronized to the E-clock, enabling connection to up to 64 KB of external memory. Mode selection is controlled by the MODA/MODB pins at reset, and the memory map shifts to expose external address space.

What development tools are officially supported for the MC68HC711E9CFNE3?

Officially supported development tools for the MC68HC711E9CFNE3 include the M68HC11EVBU evaluation board, PCbug11 debugger software, and the M68HC711E9PGMR programming module. These tools enable bootstrap loading, EPROM programming, real-time debugging, and hardware-assisted testing. Freescale application notes EB184, EB188, and EB296 provide step-by-step guidance for setup and use with the MC68HC711E9CFNE3.