Renesas M37540E8FP

Overview

M37540E8FP from Renesas Electronics is an 8-bit CISC single-chip microcontroller in the 7540 Group, featuring 60 KB on-chip Mask ROM, 2 KB RAM, a 10-bit A/D converter with 8 channels, three 16-bit timers (X/Y/Z), and dual serial I/O interfaces. It operates at up to 10 MHz using an external crystal or on-chip RC oscillator and targets embedded control in industrial appliances and office equipment.

For engineers reviewing the M37540E8FP datasheet, M37540E8FP pinout, M37540E8FP application, or M37540E8FP equivalent, this page delivers verified functional identity, confirmed package mapping (PLCC-68), validated pin roles, real-world use cases in motor control and sensor interfacing, and two technically documented alternative MCUs for design continuity.

Technical Context

The M37540E8FP implements the Renesas 740-family CPU core with 131 instructions and supports single-chip mode operation via internal clock generation. Its interrupt system includes 16 vector sources with priority encoding, key-on wake-up capability on four dedicated input pins, and reset handling via power-on, watchdog, and external inputs.

Peripheral integration includes Timer X (pulse output/event counter), Timer Y/Z (programmable waveform/one-shot generation), Serial I/O1 (synchronous/asynchronous) and Serial I/O2 (synchronous only), plus an A/D converter with sample-and-hold and conversion time of 64 µs per channel at 10 MHz.

Key Specifications

Pinout & Package

Package: 68-pin PLCC (Plastic Leaded Chip Carrier) with 25.4 mm × 25.4 mm body and 1.27 mm pitch - suitable for through-hole mounting and reflow-compatible assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with UPD78F0503GC-GAH-AX and M37540E6GP, the M37540E8FP provides the highest on-chip Mask ROM (60 KB) and RAM (2 KB) in its PLCC-68 footprint, making it optimal for feature-rich legacy industrial firmware where Flash reprogramming is not required.

Availability

M37540E8FP is available at Aetrix Electronics and suitable for industrial motor control, office equipment sensor interfacing, home appliance power management, and test & measurement front-end applications requiring stable component supply across long-lifecycle programs.

Supply support for M37540E8FP 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 formed in 2010 through the merger of NEC Electronics and Renesas Technology, specializing in microcontrollers, analog, and power solutions.

The 7540 Group - including M37540E8FP - was designed for cost-sensitive, high-reliability embedded control in standard-grade applications such as office automation, industrial machinery, and consumer appliances.

FAQ

What is the maximum operating frequency of the M37540E8FP?

The M37540E8FP supports a maximum external clock frequency of 10 MHz via the XIN/XOUT pins. At this frequency, the CPU executes instructions at 1.25 MIPS. The on-chip RC oscillator provides fixed 400 kHz or 1 MHz options for lower-speed, crystal-free operation. Electrical characteristics in the Renesas 7540 Group User's Manual Rev.2.00 confirm timing margins are guaranteed up to 10 MHz across commercial temperature range (0°C to +70°C).

Does the M37540E8FP support in-circuit debugging?

No, the M37540E8FP does not include on-chip debug circuitry or dedicated debug interface pins. It relies on external EPROM emulators or ROM monitor-based development methods as described in the 7540 Group User's Manual. Unlike later Renesas families (e.g., RL78), the M37540E8FP lacks SWD or JTAG support - firmware validation requires pre-programmed Mask ROM samples or OTP devices during development.

How many analog input channels does the M37540E8FP A/D converter support?

The M37540E8FP integrates a single 10-bit successive-approximation A/D converter with 8 multiplexed analog input channels (AD0–AD7), mapped directly to Port 2 pins P20–P27. Conversion time is 64 µs per channel at 10 MHz system clock, and the module supports software-started or timer-triggered conversions as documented in Chapter 1.9 of the 7540 Group User's Manual.

What package type is used for the M37540E8FP?

The M37540E8FP is packaged in a 68-pin Plastic Leaded Chip Carrier (PLCC) with 25.4 mm × 25.4 mm body size and 1.27 mm pin pitch. Pin configuration and mechanical dimensions are specified in Section 1.3 ("Pin Configuration") of the 7540 Group User's Manual Rev.2.00. This package supports both through-hole prototyping and surface-mount reflow assembly.

Is the M37540E8FP RoHS compliant?

Yes, the M37540E8FP meets EU RoHS Directive requirements as confirmed by Renesas Electronics' environmental compliance documentation. The device contains no lead, mercury, cadmium, hexavalent chromium, PBB, or PBDE above threshold limits. Compliance applies to all manufacturing lots produced after April 2006, and material declarations are available upon request from Renesas sales offices.