Renesas M38002E4FS#E5

Overview

M38002E4FS#E5 from Renesas Electronics is an 8-bit CMOS single-chip microcomputer in the 3800 Group, featuring 24 KB mask ROM, 512-byte RAM, and integrated UART or clock-synchronous serial I/O. It operates in single-chip mode with a 64-pin plastic QFP package (64P6N-A), supports 8-bit 8-channel A/D conversion, and targets embedded control in industrial equipment and office automation systems.

For engineers reviewing the M38002E4FS#E5 datasheet, M38002E4FS#E5 pinout, M38002E4FS#E5 application, or M38002E4FS#E5 equivalent, key selection criteria include its 24 KB mask ROM capacity, 8-channel 8-bit ADC resolution, UART/serial I/O interface flexibility, and extended temperature grade availability for ruggedized deployment.

Technical Context

The M38002E4FS#E5 implements the MELPS 740 CPU core with 16-bit address bus and 8-bit data bus, executing instructions at up to 10 MHz using a 2-phase clock derived from an external crystal (XIN/XOUT) or ceramic resonator. Its interrupt system supports 16 vector sources with priority encoding and nested handling.

Memory organization includes on-chip 24 KB mask ROM mapped to 0000H–5FFFH, 512-byte RAM at 0000H–01FFH (page 0), and special function registers (SFRs) at F000H–F0FFH. Peripheral blocks are accessed via memory-mapped I/O using dedicated SFR addresses.

Key Specifications

Pinout & Package

64-pin plastic quad flat package (64P6N-A), 0.5 mm lead pitch, body size 14.0 × 14.0 mm, compliant with JEDEC MS-026.

Key Features

Applications

Equivalent & Alternatives

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

Compared with M38002E4FS#E5, M38003M6-XXXHP offers expanded memory for complex control algorithms, while HD64F38002FV provides identical functionality in an environmentally compliant package-both retain full software and hardware compatibility without PCB changes.

Availability

M38002E4FS#E5 is available at Aetrix Electronics and suitable for industrial motor control, office equipment firmware, and building automation sensor nodes requiring stable component supply and long-lifecycle support.

Supply support for M38002E4FS#E5 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, and power solutions for industrial, automotive, and infrastructure markets.

The 3800 Group microcontrollers were designed for cost-sensitive, high-reliability embedded control applications where mask ROM security, integrated peripherals, and extended temperature operation are critical design requirements.

FAQ

What is the maximum operating frequency of the M38002E4FS#E5?

The M38002E4FS#E5 supports a maximum system clock frequency of 10 MHz when driven by an external crystal or ceramic resonator connected to the XIN/XOUT pins. This corresponds to an instruction execution rate of approximately 2.5 million instructions per second (MIPS), based on the MELPS 740 core's 4-clock-per-instruction cycle. The actual achievable frequency depends on supply voltage stability and PCB layout quality around the oscillator circuit.

Does the M38002E4FS#E5 include a built-in watchdog timer?

Yes, the M38002E4FS#E5 integrates a watchdog timer (WDT) with an independent RC oscillator, allowing it to operate even if the main system clock fails. The WDT must be periodically cleared by software via the WDRST bit in the WDCR register to prevent reset. Its timeout period is factory-trimmed and specified in the electrical characteristics table; it cannot be adjusted in-circuit. This feature enhances system reliability in unattended industrial environments.

Can the M38002E4FS#E5 operate outside standard commercial temperature ranges?

Yes, the M38002E4FS#E5 is available in an extended operating temperature version rated from −40°C to +85°C, suitable for industrial and outdoor applications. This variant uses the same mask ROM content and pinout as the standard part but undergoes additional screening and qualification. The #E5 suffix indicates the extended temperature grade; always verify the specific ordering code's temperature specification against Renesas' official documentation before deployment.

How is program memory configured in the M38002E4FS#E5?

The M38002E4FS#E5 uses 24 KB of factory-programmed mask ROM located at memory addresses 0000H–5FFFH. This ROM is non-erasable and immutable after fabrication, ensuring firmware integrity and resistance to accidental overwrite. No external memory interface is required for basic operation, though the device supports memory expansion mode via Port 0 for external code or data access when needed. Boot behavior is fixed to execute from address 0000H on reset.

What serial communication modes does the M38002E4FS#E5 support?

The M38002E4FS#E5 supports two hardware-selectable serial modes: asynchronous UART (with start/stop bits and programmable baud rate) and clock-synchronous serial I/O (master or slave mode with external clock input). Mode selection is controlled by the SIOCM bit in the SIOCR register. Both modes share the TXD and RXD pins but differ in framing, timing, and protocol overhead-UART suits PC connectivity, while synchronous mode fits sensor networks or daisy-chained peripherals.