Renesas HD64F3687FPV

Overview

HD64F3687FPV from Renesas Electronics is a 16-bit single-chip microcomputer in the H8/300H Tiny Series, featuring an H8/300H CPU core with 32 kB on-chip ROM, 2 kB RAM, 32 I/O pins, and integrated peripherals including UART (SCI), timer/counters, and interrupt controller. It operates at up to 20 MHz and targets embedded control in industrial equipment and consumer appliances.

For engineers reviewing the HD64F3687FPV datasheet, HD64F3687FPV pinout, HD64F3687FPV application, or HD64F3687FPV equivalent, key selection considerations include its 80-pin PQFP package, 5 V operation, ROM-based program storage, and support for on-board programming via SCI channel 1 in boot mode.

Technical Context

The HD64F3687FPV implements the H8/300H CPU architecture with full instruction set compatibility to the H8/300, supporting 16-bit data paths and 24-bit addressing. Its memory map includes 32 kB of mask-ROM (0x00000–0x07FFF), 2 kB of on-chip RAM (0xFFC00–0xFFFFF), and dedicated peripheral register space.

Peripheral integration includes three serial communication interfaces (SCI0–SCI2), four 16-bit timer modules (with input capture/output compare), a watchdog timer, and a 12-channel 10-bit A/D converter. Clock generation supports crystal (1–20 MHz), ceramic resonator, or external clock input with programmable prescalers.

Key Specifications

Pinout & Package

HD64F3687FPV is housed in an 80-pin PQFP (Plastic Quad Flat Package) with 0.65 mm lead pitch and 14 mm × 14 mm body size. Pin assignments follow the H8/3687 Group standard layout defined in the Hardware Manual Rev.5.00.

Key Features

Applications

Equivalent & Alternatives

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

Compared with HD64F3687FPV, HD64F3687G offers identical functionality in an alternate PQFP variant optimized for different PCB assembly conditions, while HD64F3684 provides a scaled-down memory and I/O configuration for less complex applications - both require firmware and pinout review due to non-drop-in compatibility.

Availability

HD64F3687FPV is available at Aetrix Electronics and suitable for industrial motor control, home appliance UI, factory automation I/O, and point-of-sale peripheral applications requiring stable component supply and long-term production continuity.

Supply support for HD64F3687FPV 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 H8/3687 Group - including HD64F3687FPV - was designed for cost-sensitive, high-reliability embedded control in consumer and industrial equipment where ROM-based execution, low power, and integrated analog peripherals are essential.

FAQ

What is the maximum operating frequency of the HD64F3687FPV?

The HD64F3687FPV supports a maximum system clock frequency of 20 MHz when driven by an external crystal or resonator connected to the XTAL/EXTAL pins. This frequency enables real-time execution of control algorithms with predictable interrupt latency and timer resolution, and is validated across the commercial temperature range (0°C to +70°C). The HD64F3687FPV's internal clock generator includes prescaler circuits that allow flexible division of the main clock for peripheral modules.

Does the HD64F3687FPV support in-system programming?

Yes, the HD64F3687FPV supports on-board programming via SCI channel 1 (pins P21/RXD and P22/TXD) when configured in boot mode. This capability allows firmware updates without removing the device from the PCB or using external programming hardware. The HD64F3687FPV requires no external ROM or flash memory for this function, as the bootloader resides in mask-ROM. Programming is performed using standard UART framing and Renesas-defined command sequences.

What are the power supply requirements for the HD64F3687FPV?

The HD64F3687FPV operates from a single 5 V ±10% supply, with separate VCC1 and VCC2 pins for core and I/O domains. It requires decoupling capacitors (typically 0.1 µF ceramic per VCC pin) placed near the package to suppress switching noise. The device draws approximately 35 mA at 20 MHz in active mode and drops to <100 µA in standby mode. All VSS pins must be connected to a low-impedance ground plane to ensure signal integrity and EMI compliance.

How many analog input channels does the HD64F3687FPV include?

The HD64F3687FPV integrates a 12-channel 10-bit successive-approximation A/D converter with a typical conversion time of 1.2 µs. Channels AN0–AN11 map to dedicated port pins (P00–P03, P20–P27, P80–P83), allowing simultaneous sampling of temperature sensors, potentiometers, or current shunts. The A/D module includes internal reference voltage and software-selectable sample-and-hold timing, and its results are stored directly into on-chip RAM without CPU intervention via DMA-like transfer.

Is the HD64F3687FPV pin-compatible with other devices in the H8/3687 Group?

No, the HD64F3687FPV is not fully pin-compatible with all members of the H8/3687 Group. While it shares the same 80-pin PQFP footprint with HD64F3687G, differences exist in thermal pad configuration and moisture sensitivity level. Devices like HD64F3684 use a 64-pin package and have fewer I/O pins and reduced memory, making them mechanically and electrically incompatible. Pin mapping must be verified against the specific device's Hardware Manual Rev.5.00 before PCB reuse.