Renesas M37640E8FP

Overview

M37640E8FP from Renesas Technology Corp. is a single-chip 8-bit CMOS microcontroller with USB 1.1 function controller, 32 KB on-chip ROM, 1 KB on-chip RAM, and 66 programmable I/O ports-designed for PC peripheral applications including digital cameras, modems, and audio systems.

For engineers reviewing the M37640E8FP datasheet, M37640E8FP pinout, M37640E8FP application, or M37640E8FP equivalent, key selection criteria include USB endpoint count (4), dual UART support, memory expansion mode capability, and 80-pin QFP package compatibility with industrial temperature range (-20 to 85°C).

Technical Context

The M37640E8FP implements a Harvard-architecture 8-bit CPU with 71 basic instructions and minimum 83 ns instruction execution time at 12 MHz. It integrates a dedicated USB 1.1 function controller supporting four endpoints (including one control endpoint) and a frequency synthesizer for USB clock generation.

Its memory expansion architecture includes Master Bus Interface (MBI) with 17 signals and 8 data lines, enabling external memory access via address/data multiplexing on P0–P2, while supporting RDY-controlled wait states and HOLD/HLDA bus arbitration in microprocessor mode.

Key Specifications

Pinout & Package

Package: 80-pin plastic quad flat package (80P6N-A), 14 × 14 mm body, 0.65 mm pitch, exposed pad optional.

Key Features

Applications

Equivalent & Alternatives

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

Compared with R5F566TEADFP and HD64F3687FP, the M37640E8FP delivers optimal cost/performance balance for USB 1.1 peripheral designs requiring minimal external components, proven industrial temperature operation, and legacy firmware compatibility within the Renesas 7640 ecosystem.

Availability

M37640E8FP is available at Aetrix Electronics and suitable for digital camera interfaces, PC modem control units, and USB audio peripherals requiring stable component supply across long-lifecycle industrial programs.

Supply support for M37640E8FP 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 Technology Corp. (now part of Renesas Electronics Corporation) is a Japanese semiconductor manufacturer specializing in microcontrollers, analog, and power devices-formed in 2003 through the merger of Hitachi and Mitsubishi Electric's semiconductor operations.

The 7640 Group microcontrollers-including M37640E8FP-are designed specifically for USB-enabled PC peripherals, integrating USB 1.1 functionality, memory expansion capability, and industrial-grade timing peripherals in a single 8-bit solution.

FAQ

What is the maximum operating frequency of the M37640E8FP?

The M37640E8FP supports a maximum external clock frequency of 24 MHz on the Xin/Xout pins, or 12 MHz on the XCin/XCout pins. At 12 MHz system clock, it achieves a minimum instruction execution time of 83 ns for single-cycle instructions-enabling real-time response in USB transaction handling and timer-based peripheral control.

Does the M37640E8FP include an integrated USB transceiver?

Yes, the M37640E8FP integrates a full-speed USB 1.1 transceiver with differential D+ and D− pins. It requires only 33 Ω series resistors on each line and supports USB suspend/resume signaling. The internal frequency synthesizer generates the required 48 MHz USB clock from a 12 MHz crystal, eliminating external clock components.

How many UART interfaces does the M37640E8FP support?

The M37640E8FP supports two independent full-duplex UARTs (UART1 and UART2), each with dedicated transmit/receive pins and hardware flow control (CTS/RTS). UART1 uses P84–P87; UART2 uses P80–P83. Both operate concurrently and can be configured for different baud rates and framing parameters.

What package type is used for the M37640E8FP?

The M37640E8FP is housed in an 80-pin plastic quad flat package (80P6N-A), measuring 14 mm × 14 mm with 0.65 mm lead pitch. This package is RoHS-compliant and compatible with standard surface-mount reflow processes used in industrial and consumer electronics manufacturing.

Is the M37640E8FP pin-compatible with other members of the 7640 Group?

Yes, the M37640E8FP shares identical pinout and electrical characteristics with other 80-pin 7640 Group variants including M37640M8-XXXFP (mask ROM) and M37640E8FS (EPROM). Firmware and hardware designs targeting this package footprint are directly interchangeable across these versions.