Renesas M37540E2FP#U0

Overview

M37540E2FP#U0 from Mitsubishi Electric is an 8-bit single-chip microcomputer in the 7540 Group, featuring 64 KB ROM, 2 KB RAM, and integrated peripherals including Timer A/X/Y/Z, dual serial I/O (SIO1/SIO2), 8-channel 10-bit A-D converter, and watchdog timer. It operates at up to 10 MHz with 5 V supply and targets industrial control panels and embedded instrumentation requiring deterministic real-time response.

For engineers reviewing the M37540E2FP#U0 datasheet, M37540E2FP#U0 pinout, M37540E2FP#U0 application, or M37540E2FP#U0 equivalent, key selection considerations include its 32-pin plastic DIP (32P6U-A) package, mask ROM configuration, 10-bit A-D resolution with sample-and-hold, and support for both synchronous and asynchronous serial communication protocols.

Technical Context

The M37540E2FP#U0 implements the 740-family CPU core with 16-bit address bus and 8-bit data bus, executing instructions in 1–4 clock cycles. Its memory map includes on-chip mask ROM (64 KB), RAM (2 KB), and special function registers mapped to fixed addresses starting at 0x30.

Peripheral integration follows a register-based control architecture: Timer A supports period measurement and event counting; Timers X/Y/Z provide programmable waveform generation and one-shot output; SIO1/SIO2 support clock-synchronous and UART-like modes; the A-D converter features software-triggered conversion with interrupt-on-completion.

Key Specifications

Pinout & Package

Package: 32-pin plastic DIP (32P6U-A type), 0.6-inch body width, through-hole mounting, JEDEC MS-001AC compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with M37540E2FP#U0, the M37540E4FP#U0 offers double ROM capacity without changing timing or I/O behavior, while the M37540E2GP#U0 retains full functional equivalence in a surface-mount footprint - enabling layout reuse with only land pattern adjustment.

Availability

M37540E2FP#U0 is available at Aetrix Electronics and suitable for industrial control panels, embedded data loggers, and motor speed controllers requiring stable component supply and long-term obsolescence management.

Supply support for M37540E2FP#U0 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

Mitsubishi Electric Corporation is a Japanese multinational specializing in power systems, industrial automation, and semiconductor devices, with decades of experience in microcontroller design for industrial and automotive applications.

The 7540 Group was designed for cost-sensitive, high-reliability embedded control applications where deterministic real-time response, integrated analog interfaces, and long-lifecycle support are critical - especially in factory automation and instrumentation.

FAQ

What is the maximum operating frequency of the M37540E2FP#U0?

The M37540E2FP#U0 operates at a maximum system clock frequency of 10 MHz when using the internal oscillator with an external crystal connected between XIN and XOUT. This corresponds to a 100 ns minimum instruction cycle time for single-cycle operations. The actual achievable frequency depends on crystal load capacitance and stability; Mitsubishi specifies operation across 1–10 MHz with appropriate crystal selection and PCB layout.

Does the M37540E2FP#U0 support in-circuit programming or debugging?

No, the M37540E2FP#U0 contains mask ROM and does not support in-circuit programming. Firmware is factory-programmed during wafer fabrication and cannot be modified post-manufacture. Debugging requires external emulators compatible with the 740-family bus protocol, such as the M37540E2FP#U0-specific development tools referenced in the "Mitsubishi Microcomputer Development Support Tools" homepage.

How many analog input channels does the A-D converter in the M37540E2FP#U0 support?

The M37540E2FP#U0 integrates an 8-channel, 10-bit successive-approximation A-D converter. All eight channels map directly to Port 2 pins (P20–P27), and channel selection is controlled via the ADCH register. Each conversion completes in 1024 clock cycles, and the result is stored in the ADRES register with interrupt flag ADIF set upon completion.

What packaging format is used for the M37540E2FP#U0?

The M37540E2FP#U0 is supplied in a 32-pin plastic DIP (dual in-line package) designated as 32P6U-A type. It has a 0.6-inch body width, 0.1-inch pin pitch, and through-hole mounting configuration. This package is documented in Section 3.6 "Package outline" and Figure 1 of the 7540 Group User's Manual (Rev. 1.0, Sep. 2002).

Can the M37540E2FP#U0 operate from a 3.3 V supply?

No, the M37540E2FP#U0 is specified for operation only within 4.5 V to 5.5 V. Its internal oscillator circuitry, I/O voltage thresholds, and A-D reference are all calibrated for 5 V nominal operation. Operating below 4.5 V may cause unreliable reset behavior, incorrect A-D readings, or failure to meet timing specifications - as confirmed in Section 3.1.1 "7540 Group (General purpose)" of the User's Manual.