Renesas M38067ECAFS

Overview

M38067ECAFS from Renesas Electronics is an 8-bit single-chip microcomputer in the 38000 Series (740 Family), featuring 24 KB mask ROM, 512-byte RAM, 13-channel 8-bit A/D converter, dual UART/clock-synchronous serial I/O, and four 8-bit timers. It operates at up to 10 MHz with a 5 V supply and targets industrial control, sensor interface, and embedded instrumentation applications.

For engineers reviewing the M38067ECAFS datasheet, M38067ECAFS pinout, M38067ECAFS application, or M38067ECAFS equivalent, key selection criteria include its 80-pin PQFP package, integrated A/D with 13 analog inputs, dual serial interfaces supporting UART and clock-synchronous modes, and mask-ROM-based firmware permanence for cost-sensitive high-volume production.

Technical Context

The M38067ECAFS implements the Renesas 740 CPU core with 16-bit address bus and 8-bit data bus, supporting both single-chip and memory expansion modes. Its interrupt system includes 16 vector sources with priority encoding and nested interrupt capability.

Peripheral integration includes two independent serial I/O modules-each configurable as UART or clock-synchronous mode-with programmable baud rates and framing control. The A/D converter supports simultaneous sampling across 13 channels with conversion time of 64 µs per channel at 10 MHz operation.

Key Specifications

Pinout & Package

Package: 80-pin PQFP (80P6N-A), 14 × 14 mm body, 0.65 mm lead pitch, standard JEDEC MS-026AC footprint.

Key Features

Applications

Equivalent & Alternatives

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

Compared with M38067ECBFS, the M38067ECAFS offers identical functionality at lower temperature grade (0°C to +70°C), reducing cost for indoor industrial use; versus UPD78F0503GC-GAH-AX, it trades flash programmability and 12-bit A/D for proven mask-ROM reliability and simpler 8-bit software maintenance.

Availability

M38067ECAFS is available at Aetrix Electronics and suitable for industrial sensor hubs, legacy equipment controllers, and embedded instrumentation panels requiring stable component supply and long-term manufacturing continuity.

Supply support for M38067ECAFS 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

Renesas Electronics Corporation is a global semiconductor leader specializing in microcontrollers, analog, power, and SoC solutions for industrial, automotive, and infrastructure markets.

The 38000 Series-including the M38067ECAFS-is designed for cost-sensitive, high-volume embedded control applications where mask-ROM permanence, deterministic real-time response, and minimal external components are critical.

FAQ

What is the maximum operating frequency of the M38067ECAFS?

The M38067ECAFS operates at a maximum system clock frequency of 10 MHz, derived from an external crystal (XIN/XOUT) or ceramic resonator. This frequency determines instruction execution speed, A/D conversion timing, and serial baud rate limits. All electrical characteristics in the datasheet-including A/D conversion time of 64 µs-are specified at this 10 MHz condition. Operation beyond 10 MHz is not supported and may cause functional failure.

Does the M38067ECAFS support in-circuit programming or firmware updates?

No, the M38067ECAFS uses mask ROM for program storage, meaning firmware is permanently programmed during wafer fabrication and cannot be modified after packaging. This eliminates the need for bootloaders or programming hardware but requires final firmware validation before ordering. For field-upgradable alternatives, consider Renesas flash-based RL78 or RX devices-not the M38067ECAFS.

How many analog input channels does the M38067ECAFS A/D converter support?

The M38067ECAFS integrates a single 8-bit successive-approximation A/D converter with 13 dedicated analog input channels (AD0–AD12), accessible via pins on port P5 and P6. These channels are scanned sequentially under software or timer control, with each conversion completing in 64 µs at 10 MHz system clock. No external sample-and-hold or multiplexer is needed for basic multi-channel acquisition.

What serial communication protocols does the M38067ECAFS natively support?

The M38067ECAFS features two independent serial I/O modules (SIO0 and SIO1), each configurable in either UART mode (asynchronous, with programmable baud rate generator) or clock-synchronous mode (master or slave, supporting SPI-like framing). Neither module supports I²C or CAN. UART mode enables RS-232/RS-485 interface; clock-synchronous mode allows daisy-chained peripheral control using shift-register timing.

Is the M38067ECAFS pin-compatible with other members of the 3806 Group?

Yes, the M38067ECAFS shares the same 80-pin PQFP (80P6N-A) package and pinout with all mask-ROM variants in the 3806 Group-including M38067ECBFS (extended temp) and M38067ECPFS (high-speed). Differences between these variants are limited to operating temperature range, maximum clock frequency, and internal timing parameters-not pin function or assignment-enabling direct PCB reuse across qualified versions.