NXP Semiconductors MC68HC711P2CFN4

Overview

MC68HC711P2CFN4 from Freescale Semiconductor is an 8-bit EPROM-based microcontroller featuring a 4 MHz bus-capable M68HC11 CPU core, 32 KB user EPROM, 1 KB RAM, 640 bytes byte-erasable EEPROM with on-chip charge pump, and integrated peripherals including 8-channel 8-bit ADC, 16-bit timer with input capture/output compare, three SCI subsystems (two MI BUS–capable), SPI, and four PWM channels. It targets automotive and mobile communications control systems.

For engineers reviewing the MC68HC711P2CFN4 datasheet, MC68HC711P2CFN4 pinout, MC68HC711P2CFN4 application, or MC68HC711P2CFN4 equivalent, key selection criteria include EPROM programmability for field updates, non-multiplexed 64 KB address space for direct memory access, PLL clock circuit with WAIT-mode auto-disable, and MI BUS support for noise-immune distributed control in harsh environments.

Technical Context

The MC68HC711P2CFN4 implements the M68HC11 CPU core with full instruction set compatibility, supporting single-cycle 8-bit operations and indexed addressing. Its memory architecture includes fixed ROM/EPROM mapping, configurable RAM remapping, and EEPROM block protection with erase mode selection.

Peripherals are tightly coupled to the CPU via dedicated registers and interrupt vectors: the 16-bit timer supports up to five output compare and four input capture functions; SCI1/SCI2 integrate MI BUS protocol encoding/decoding; and the 8-channel ADC uses external VRH/VRL references with sample-and-hold timing controlled by internal clocks.

Key Specifications

Pinout & Package

MC68HC711P2CFN4 is housed in an 84-pin PLCC package (plastic-leaded chip carrier), with pin 1 located at the index corner and pins numbered counterclockwise. The package supports standard surface-mount reflow profiles and provides mechanical compatibility with CERQUAD variants.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC68HC11P2CFN4 and MC68HC11E9CFN2, the MC68HC711P2CFN4 uniquely balances field-programmable EPROM, MI BUS support, and mature automotive qualification-making it irreplaceable in legacy vehicle ECU upgrades requiring hardware-compatible firmware patches.

Availability

MC68HC711P2CFN4 is available at Aetrix Electronics and suitable for automotive engine control, industrial motor drives, mobile radio baseband processing, and embedded telematics gateways requiring stable component supply across extended product lifecycles.

Supply support for MC68HC711P2CFN4 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, founded in 2004 as a spin-off from Motorola's semiconductor division.

The MC68HC711P2CFN4 belongs to the M68HC11 family, engineered specifically for deterministic real-time control in electrically noisy environments such as automotive powertrains and industrial machinery-emphasizing robust communication (MI BUS), on-chip nonvolatile storage, and low-power operational modes.

FAQ

What is the maximum operating frequency of the MC68HC711P2CFN4 CPU core?

The MC68HC711P2CFN4 CPU core operates at a maximum bus frequency of 4 MHz. This is achieved using an internal phase-locked loop (PLL) that multiplies the external crystal or clock input. The E clock output reflects this derived timing and synchronizes peripheral subsystems. Actual instruction execution throughput depends on opcode length and addressing mode, with most instructions completing in 2–6 E cycles.

Does the MC68HC711P2CFN4 support in-circuit EPROM programming?

Yes, the MC68HC711P2CFN4 supports in-circuit EPROM programming using the XIRQ/VPPE pin as the high-voltage programming input (12.5 V). Programming requires specific timing sequences and voltage ramping controlled by on-chip logic, with the charge pump enabling internal generation of programming voltage. Full EPROM erase and byte-write operations are supported via dedicated EEPROM control registers and block protection settings.

How many analog input channels does the MC68HC711P2CFN4 ADC support, and what is its resolution?

The MC68HC711P2CFN4 integrates an 8-channel, 8-bit successive-approximation analog-to-digital converter. Channels AD0–AD7 map directly to Port E pins PE0–PE7. Conversion uses external VRH and VRL reference inputs to define the full-scale range, and supports sample-and-hold timing controlled by internal prescalers. No internal reference is provided; external precision references are required for accurate measurements.

What communication protocols are natively supported by the MC68HC711P2CFN4?

The MC68HC711P2CFN4 natively supports three serial communication interfaces: SCI1, SCI2, and SCI3. SCI1 and SCI2 include hardware-level MI BUS protocol encoding and decoding for noise-immune distributed control. All three SCIs operate as standard UARTs with programmable baud rates. Additionally, the device includes a full-duplex SPI subsystem supporting master/slave modes and software-selectable MSB/LSB-first bit ordering.

Is the MC68HC711P2CFN4 pin-compatible with other M68HC11 family members?

Yes, the MC68HC711P2CFN4 shares identical pinout, memory map, and peripheral register layout with the MC68HC11P2CFN4 and MC68HC11E9CFN2 in the 84-pin PLCC package. Functional differences-such as EPROM vs. ROM, MI BUS presence, or ADC resolution-are implemented internally and do not affect physical connectivity. However, firmware must account for memory type (EPROM vs. ROM) and peripheral enable/disable states during initialization.