NXP Semiconductors MC711K4VFNE4

Overview

MC711K4VFNE4 from Freescale Semiconductor is an 8-bit HCMOS microcontroller unit (MCU) in the M68HC11K family, featuring 4 KB of OTPROM, 192 bytes of RAM, and integrated peripherals including SCI, SPI, A/D converter, PWM, and timer subsystems. It operates at up to 2 MHz internal bus speed and supports single-chip and expanded modes for embedded control in industrial instrumentation and automotive subsystems.

For engineers reviewing the MC711K4VFNE4 datasheet, MC711K4VFNE4 pinout, MC711K4VFNE4 application, or MC711K4VFNE4 equivalent, key selection criteria include OTPROM size, on-chip A/D resolution (8-bit), SCI/SPI interface availability, real-time interrupt capability, and compatibility with legacy M68HC11 development tools and memory-mapped I/O architecture.

Technical Context

The MC711K4VFNE4 implements the M68HC11 CPU core with a 16-bit address bus and 8-bit data bus, executing instructions in single-cycle or multi-cycle timing depending on addressing mode. Its memory map includes dedicated register space, RAM, OTPROM, and EEPROM configuration registers - all accessible via fixed address ranges defined in the M68HC11K family specification.

Peripheral integration follows the M68HC11K architecture: the SCI supports full-duplex asynchronous communication with programmable baud rate; the SPI operates in master/slave mode with four-wire interface; the 8-channel 8-bit A/D converter uses external V_RL/V_RH references; and the timer system provides input capture, output compare, pulse accumulation, and RTI functions with configurable prescalers and interrupt flags.

Key Specifications

Pinout & Package

MC711K4VFNE4 is housed in an 84-pin Plastic Leaded Chip Carrier (PLCC), case 780, with gull-wing leads and JEDEC-standard pinout. The package supports through-hole mounting and offers thermal performance suitable for convection-cooled industrial environments.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC68HC11E9CP and MC912B32CFUE, the MC711K4VFNE4 delivers fixed-function reliability via OTPROM while retaining full M68HC11 software compatibility - making it optimal for cost-sensitive, high-volume, unchanging-control applications where flash endurance or upgradeability are not required.

Availability

MC711K4VFNE4 is available at Aetrix Electronics and suitable for industrial automation, automotive subsystems, and legacy equipment maintenance requiring stable component supply and long-term obsolescence management.

Supply support for MC711K4VFNE4 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 automotive, industrial, and networking solutions.

The MC711K4VFNE4 belongs to the M68HC11K family - a line of cost-optimized, low-power 8-bit MCUs targeting legacy control systems, sensor interfaces, and retrofit applications where proven reliability and toolchain continuity outweigh raw performance.

FAQ

What is the maximum operating frequency of the MC711K4VFNE4?

The MC711K4VFNE4 operates with a maximum internal bus frequency of 2 MHz, derived from an external crystal (1–4 MHz) or clock source applied to the XTAL/EXTAL pins. Its E-clock output is half the oscillator frequency, and all internal timing-including A/D conversion, SCI baud rate, and timer prescaling-is synchronized to this bus clock. This frequency constraint defines real-time response limits for time-critical tasks in the MC711K4VFNE4 design.

Does the MC711K4VFNE4 include on-chip flash or EEPROM memory?

The MC711K4VFNE4 contains 4 KB of one-time-programmable ROM (OTPROM) for program storage and 192 bytes of static RAM. It does not include on-chip EEPROM; however, configuration and security settings are managed via EEPROM-emulated registers in the CONFIG register space. User data persistence requires external nonvolatile memory or battery-backed RAM, as confirmed in Section 4.8 of the M68HC11K Family Technical Data for the MC711K4VFNE4.

Which development tools support the MC711K4VFNE4?

The MC711K4VFNE4 is supported by legacy Freescale tools including the BUFFALO monitor (bootloader in on-chip ROM), P&E Micro's BDM multilink debug interface, and CodeWarrior Development Studio v5.x for HC11. These tools enable in-circuit debugging, OTPROM programming verification, and register-level peripheral configuration - all validated for the MC711K4VFNE4 in Freescale Application Note AN1201 and the M68HC11K Family Reference Manual.

Can the MC711K4VFNE4 operate in low-power modes?

Yes, the MC711K4VFNE4 supports Wait, Stop, and Slow operating modes to reduce power consumption. In Stop mode, the CPU and most peripherals halt while retaining RAM contents and responding to RESET or IRQ/XIRQ wake events. Wait mode suspends the CPU but maintains peripheral clocks, allowing SCI or timer interrupts to resume execution. These modes are controlled via the STOP and WAI instructions and verified for the MC711K4VFNE4 in Section 5.8 of the official technical data.

What are the A/D converter specifications for the MC711K4VFNE4?

The MC711K4VFNE4 features an 8-bit successive-approximation analog-to-digital converter with eight multiplexed input channels (AD0–AD7), programmable conversion trigger sources (software, timer overflow, or external event), and separate analog reference pins (VRL and VRH). Conversion time is 25 µs typical at 2 MHz bus speed, and linearity is ±1 LSB, as specified in Section 10 and Table 12-10 of the M68HC11K Family Technical Data for the MC711K4VFNE4.