NXP Semiconductors MC705L16CFUE

Overview

MC705L16CFUE from Freescale Semiconductor is an 8-bit microcontroller in the M68HC05 family, featuring 16 KB mask-programmed ROM, 192 bytes RAM, and integrated LCD driver for segment-based displays. It operates at up to 4 MHz (with internal oscillator), supports single-chip mode, and includes two 16-bit timers, SSPI interface, and low-power stop/wait modes - used in battery-powered instrumentation and industrial control panels.

For engineers reviewing the MC705L16CFUE datasheet, MC705L16CFUE pinout, MC705L16CFUE application, or MC705L16CFUE equivalent, this page delivers verified electrical specs, functional pin mapping, real-world use cases, and validated alternative parts for design continuity and sourcing resilience.

Technical Context

The MC705L16CFUE implements a Harvard-architecture CPU core with 16-bit address bus and 8-bit data path, executing instructions in one to five cycles. Its memory map integrates 16 KB ROM (non-reprogrammable), 192 B RAM, and dedicated I/O registers mapped into the same address space as data memory.

It features dual clock sources: primary OSC (crystal/resonator up to 4 MHz) and auxiliary XOSC (for external clock input), with configurable timebase outputs (LCDCLK, STUP, TBI) and COP watchdog. The SSPI module supports master-only synchronous serial communication at programmable bit rates.

Key Specifications

Pinout & Package

MC705L16CFUE is housed in a 44-pin QFP package (Case 841B-01), measuring 10 mm × 10 mm with 0.8 mm pitch. Pin functions are defined per Appendix A of the Rev. 4.1 datasheet and validated for this specific variant.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 8-bit microcontroller applications.

Compared with MC68HC705L16CP and MC9RS08KA2CSC, the MC705L16CFUE offers optimal integration for cost-sensitive, high-volume LCD-based controls - delivering lowest BOM count, smallest PCB footprint, and guaranteed timing behavior without flash wear concerns.

Availability

MC705L16CFUE is available at Aetrix Electronics and suitable for industrial panel meters, portable test equipment, and appliance user interfaces requiring stable component supply across multi-year production cycles.

Supply support for MC705L16CFUE 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) is a fabless semiconductor company specializing in embedded processing, analog, and connectivity solutions for automotive, industrial, and consumer markets.

The MC705L16CFUE belongs to the M68HC05 microcontroller family, designed specifically for cost-effective, low-power, LCD-integrated control applications in instrumentation and home appliances.

FAQ

What is the maximum operating frequency of the MC705L16CFUE?

The MC705L16CFUE supports a maximum system clock frequency of 4 MHz when using the internal oscillator with an external crystal or ceramic resonator on OSC1/OSC2. This frequency is specified across the full –40°C to +85°C temperature range and 2.7 V to 5.0 V supply voltage, enabling deterministic real-time control in time-critical embedded applications. The MC705L16CFUE does not support PLL-based frequency multiplication.

Does the MC705L16CFUE support in-circuit programming?

No, the MC705L16CFUE contains mask-programmed ROM and cannot be reprogrammed after fabrication. Firmware is permanently embedded during wafer manufacturing, making it suitable for high-volume, fixed-function applications where code stability and cost are critical. For field-upgradable alternatives, consider flash-based derivatives like the RS08 or S08 families - but note these require external LCD drivers.

What LCD configurations does the MC705L16CFUE support?

The MC705L16CFUE supports static, 1/2-bias, and 1/3-bias LCD drive schemes via VLCD1–VLCD3 pins and internal bias generation. It can drive up to 32 segments × 4 commons (128 segments total) in multiplexed mode, or up to 128 segments in static mode. The LCD control register allows runtime selection of bias ratio, frame frequency, and duty cycle - all without CPU intervention.

Can the MC705L16CFUE operate from a 3.3 V supply?

Yes, the MC705L16CFUE is fully specified for 3.3 V operation per Section 12.7 of the Rev. 4.1 datasheet. At 3.3 V, it maintains full functionality including LCD driving, SSPI communication, and timer operation across the industrial temperature range (–40°C to +85°C), with typical current consumption of 2.5 mA active and ≤1 µA in stop mode.

What are the key differences between MC705L16CFUE and MC68HC05L16?

The MC705L16CFUE is a variant of the MC68HC705L16 - not the base MC68HC05L16. Key distinctions include bootstrap mode support, enhanced reset behavior, and updated mask options. Unlike the MC68HC05L16, the MC705L16CFUE adds XOSC capability, improved COP watchdog timing, and extended I/O configuration registers - all documented in Appendix A of the shared datasheet.