NXP Semiconductors MC705X32MFUE4

Overview

MC705X32MFUE4 from Freescale Semiconductor is a high-density HCMOS microcontroller unit featuring an 8-bit CPU core, 32 KB on-chip ROM, 256 bytes RAM, integrated Motorola CAN module (MCAN), 8-channel 8-bit ADC, and dual 16-bit programmable timers. It operates at up to 4 MHz with single-chip mode and supports STOP/WAIT/SLOW low-power states for automotive body control and industrial sensor nodes.

For engineers reviewing the MC705X32MFUE4 datasheet, MC705X32MFUE4 pinout, MC705X32MFUE4 application, or MC705X32MFUE4 equivalent, key selection criteria include CAN 2.0A/B compliance, on-chip EEPROM programming capability, PLM-based D/A output, SCI serial interface timing, and VDD/VSS decoupling requirements per Section 2.3 and 12 of the official technical data manual.

Technical Context

The MC705X32MFUE4 implements the MC68HC05 CPU core with 11-bit address space, supporting 63 instructions including bit-manipulation and read-modify-write operations. Its memory map includes 32 KB mask-programmed ROM, 256 B static RAM, and 128 B EEPROM with dedicated control registers (OPTR, CCNTRL, CSTAT) for nonvolatile storage management.

Real-time peripherals include a Motorola CAN module compliant with ISO 11898-1, two 16-bit timers with input capture/output compare/PLM modes, an 8-channel 8-bit successive-approximation ADC with internal reference, and a full-duplex SCI supporting asynchronous/synchronous operation with baud rate generation via BAUD register.

Key Specifications

Pinout & Package

MC705X32MFUE4 is housed in a 64-pin QFP (Quad Flat Package) with 0.5 mm pitch, conforming to JEDEC MS-026 standard. Pin assignments are defined in Section 2.3 of the MC68HC05X32 technical data manual.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC68HC908JK3 and MC9S08DZ128, the MC705X32MFUE4 offers balanced integration of CAN, ADC, and timers in a mature 5 V HCMOS process-ideal for legacy automotive ECUs where pin compatibility and long-term supply stability are critical.

Availability

MC705X32MFUE4 is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor nodes, motor drive interfaces, and smart actuator controllers requiring stable component supply across extended product lifecycles.

Supply support for MC705X32MFUE4 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 for automotive, industrial, and consumer markets.

The MC68HC05X32 family was developed for cost-sensitive, real-time control applications demanding CAN connectivity, analog sensing, and low-power operation in harsh environments.

FAQ

What is the maximum operating frequency of the MC705X32MFUE4?

The MC705X32MFUE4 operates at up to 4 MHz system clock frequency. This is achieved using an external crystal or ceramic resonator connected to OSC1/OSC2 pins, or via an external clock source. The internal oscillator divider allows flexible clock scaling, and electrical specifications in Section 12 confirm stable operation across the full 4.5–5.5 V supply range at this frequency.

Does the MC705X32MFUE4 include on-chip EEPROM, and how is it accessed?

Yes, the MC705X32MFUE4 integrates 128 bytes of on-chip EEPROM. Access is controlled through dedicated registers: the EEPROM control register (EECR), EEPROM address register (EEAR), and EEPROM data register (EEDR). Programming and erase operations require specific timing sequences and voltage conditions documented in Section 3.5 of the technical data manual, and the OPTR register configures write protection.

How does the Motorola CAN module (MCAN) in the MC705X32MFUE4 differ from standard CAN controllers?

The MCAN module in the MC705X32MFUE4 implements Motorola's proprietary CAN interface compliant with ISO 11898-1 (CAN 2.0A/B). It features dedicated transmit/receive buffer registers (TBF/RBF), acceptance filtering via CACC/CACM, and bus timing registers (CBT0/CBT1). Unlike generic CAN peripherals, it uses MC68HC05-specific register mapping and interrupt vectors, requiring Freescale's MCAN driver libraries for full protocol stack implementation.

What power-saving modes does the MC705X32MFUE4 support, and what peripherals remain active in each?

The MC705X32MFUE4 supports STOP, WAIT, and SLOW modes. In STOP mode (<10 µA), the oscillator halts but RAM and registers retain state; only RESET, IRQ, or COP timeout can wake the device. In WAIT mode, the CPU stops but timers, SCI, and ADC remain clocked. In SLOW mode, the system clock is divided to reduce current while maintaining peripheral responsiveness-detailed in Sections 2.2 and 6.6–6.7 of the datasheet.

Is the MC705X32MFUE4 RoHS-compliant, and what packaging options are available?

Yes, the MC705X32MFUE4 is RoHS-compliant and Pb-free, matching the functionality and electrical characteristics of its non-RoHS counterpart. It is supplied exclusively in a 64-pin QFP package (JEDEC MS-026) with 0.5 mm lead pitch, as confirmed in Section 13 (Mechanical Data) and ordering information tables of the MC68HC05X32 technical data manual.