NXP Semiconductors MC68HC711E9CFN2

Overview

MC68HC711E9CFN2 from Freescale Semiconductor is an 8-bit microcontroller in the M68HC11E family, featuring 512 bytes of on-chip EEPROM, 256 bytes of RAM, and a 512-byte EPROM (OTP) program memory. It integrates a 10-bit ADC with 8 channels, two 16-bit timer modules (input capture/output compare), SCI and SPI serial interfaces, and operates at up to 2 MHz bus frequency with single-chip mode execution. It is used in industrial control panels requiring nonvolatile program storage and analog sensor interfacing.

For engineers reviewing the MC68HC711E9CFN2 datasheet, MC68HC711E9CFN2 pinout, MC68HC711E9CFN2 application, or MC68HC711E9CFN2 equivalent, key selection criteria include EPROM/EEPROM memory partitioning, 10-bit ADC resolution and channel count, SCI/SPI peripheral availability, single-chip vs. expanded mode support, and compatibility with legacy HC11 development tools and debuggers.

Technical Context

The MC68HC711E9CFN2 implements the M68HC11 CPU core with full instruction set compatibility, including indexed, extended, and inherent addressing modes. Its memory map supports configurable RAM/I/O mapping via the RAM and I/O Mapping Register (RIMR) and system initialization through the System Configuration Register (INIT).

It supports multiple operating modes - single-chip, expanded, bootstrap, and test - with dedicated reset sources including Power-On Reset (POR), external RESET, COP watchdog timeout, and clock monitor failure. The device uses an internal oscillator circuit compatible with quartz crystals or external clocks applied to XTAL/EXTAL pins.

Key Specifications

Pinout & Package

MC68HC711E9CFN2 is housed in a 52-pin PLCC (Plastic Leaded Chip Carrier) package with J-lead geometry, designed for surface-mount assembly and socket-compatible prototyping. Pin assignments follow standard M68HC11E family layout, including dual-purpose port pins (e.g., Port A as analog inputs/outputs, Port C as general-purpose I/O with direction control).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC68HC711E9CFN2, the MC68HC11A8CP lacks nonvolatile data storage and field-programmability, while the MC68HC11E20CFN2 extends code capacity and enables reprogrammability - both share identical I/O structure and timing behavior, making migration feasible with minimal firmware and toolchain adjustments.

Availability

MC68HC711E9CFN2 is available at Aetrix Electronics and suitable for industrial motor control, legacy automotive instrumentation, embedded HVAC controllers, and factory automation I/O modules requiring stable component supply and long-term obsolescence management.

Supply support for MC68HC711E9CFN2 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 and analog/mixed-signal ICs, known for the 68000 and 68HCxx families.

The M68HC11E family, including MC68HC711E9CFN2, was engineered for cost-sensitive, resource-constrained industrial and automotive control applications requiring integrated analog interfaces, deterministic real-time response, and field-programmable nonvolatile memory.

FAQ

What is the maximum operating frequency of the MC68HC711E9CFN2?

The MC68HC711E9CFN2 supports a maximum bus frequency of 2.0 MHz, derived from its internal oscillator circuit or external clock source. This corresponds to a 4 MHz crystal (or 4 MHz external clock) applied to the XTAL/EXTAL pins, as the E-clock is half the oscillator frequency. Operation above this limit violates AC timing specifications and may cause undefined behavior or data corruption in the MC68HC711E9CFN2.

Does the MC68HC711E9CFN2 support in-system programming (ISP)?

Yes, the MC68HC711E9CFN2 supports in-system programming via its bootstrap mode using the SCI interface and compatible tools such as PCBUG11. This allows firmware loading and debugging without removing the MC68HC711E9CFN2 from the target board. However, EPROM programming requires applying 12 V to the XIRQ/VPPE pin, and the OTP nature means each address can be programmed only once.

How much EEPROM memory does the MC68HC711E9CFN2 have, and what is its endurance?

The MC68HC711E9CFN2 contains 512 bytes of on-chip EEPROM, rated for a minimum of 10,000 write/erase cycles per byte under specified voltage and temperature conditions. This memory is byte-erasable and retains data for at least 10 years at 85°C, making it suitable for storing calibration constants, device configuration, or runtime logs in the MC68HC711E9CFN2.

Can the MC68HC711E9CFN2 operate in low-power modes?

Yes, the MC68HC711E9CFN2 supports Wait and Stop modes for power reduction. In Wait mode, the CPU halts while peripherals remain active; in Stop mode, nearly all internal clocks stop except for RTI wake-up capability. Both modes require specific register writes and are exited via interrupt or reset. These features help minimize current draw in battery-powered applications using the MC68HC711E9CFN2.

Is the MC68HC711E9CFN2 pin-compatible with other M68HC11E family members?

The MC68HC711E9CFN2 is pin-compatible with other 52-pin PLCC variants in the M68HC11E family, including MC68HC11E20CFN2 and MC68HC11E1CFN2, sharing identical pin functions and electrical characteristics. However, differences in memory size, OTP vs. UV-erasable EPROM, and security features mean firmware and programming procedures must be verified per device before substitution of the MC68HC711E9CFN2.