Renesas HD64F3687FPIV

Overview

HD64F3687FPIV from Renesas Electronics is a 16-bit single-chip microcomputer in the H8/300H Tiny Series, featuring an H8/300H CPU core with H8/300 instruction set compatibility, 64 KB on-chip ROM, 4 KB RAM, and integrated peripherals including UART, timer/counters, and I/O ports. It operates at up to 20 MHz and targets embedded control in industrial equipment and consumer appliances.

For engineers reviewing the HD64F3687FPIV datasheet, HD64F3687FPIV pinout, HD64F3687FPIV application, or HD64F3687FPIV equivalent, key selection considerations include its 80-pin PQFP package, 5 V operation, ROM-based program storage, and support for low-power sleep/standby modes in resource-constrained systems.

Technical Context

The HD64F3687FPIV implements the H8/300H CPU architecture with 24-bit addressing, supporting both byte- and word-aligned memory access. Its on-chip system includes a programmable clock generator with main and subclock sources, prescalers (S and W), and power-down mode controllers (SYSCR1/SYSCR2, MSTCR1/MSTCR2) enabling fine-grained module-level standby.

Peripheral integration includes three serial communication interfaces (SCI), four 16-bit timers (two with input capture/output compare), a watchdog timer, and 64 general-purpose I/O pins distributed across eight ports (P0–P7). All interrupt sources are managed via dual interrupt enable/flag registers (IENR1/IENR2, IRR1/IRR2) with configurable edge detection (IEGR1/IEGR2).

Key Specifications

Pinout & Package

HD64F3687FPIV is housed in an 80-pin PQFP (Plastic Quad Flat Package) with 0.65 mm lead pitch, JEDEC MS-026 compliant, suitable for reflow soldering and high-density PCB layouts.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 16-bit microcontroller applications.

Compared with HD64F3687FPIV, HD64F3687G offers identical electrical and functional behavior in an alternate package, while HD64F3684 reduces memory resources to lower cost-both require validation of pin mapping and thermal design but avoid architectural redesign.

Availability

HD64F3687FPIV is available at Aetrix Electronics and suitable for industrial motor control, home appliance MCU, POS terminal controller, and building automation node applications requiring stable component supply and long-term manufacturing continuity.

Supply support for HD64F3687FPIV 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 Japanese semiconductor manufacturer specializing in microcontrollers, analog, power, and SoC solutions for industrial, automotive, and infrastructure markets.

The H8/3687 Group-including HD64F3687FPIV-is designed for cost-sensitive, high-reliability embedded control applications where deterministic real-time performance, low power, and on-chip integration reduce system complexity.

FAQ

What is the maximum operating frequency of the HD64F3687FPIV?

The HD64F3687FPIV supports a maximum system clock frequency of 20 MHz when using the main clock oscillator with an external crystal or resonator. This frequency is achievable across the full specified supply voltage range (4.5 V to 5.5 V) and operating temperature range (−20 °C to +75 °C). The HD64F3687FPIV's H8/300H CPU core executes most instructions in 1–2 clock cycles, enabling predictable real-time response for time-critical control loops.

Does the HD64F3687FPIV include on-chip flash memory or only ROM?

The HD64F3687FPIV features 64 KB of on-chip mask-programmed ROM-not flash memory. This ROM is programmed during wafer fabrication and cannot be electrically rewritten in-system. Firmware must be finalized before production, making HD64F3687FPIV ideal for high-volume, unchanging applications such as appliance controllers or industrial modules where security and code immutability are priorities.

How many serial communication interfaces does the HD64F3687FPIV support?

The HD64F3687FPIV integrates three independent serial communication interfaces (SCI0, SCI1, SCI2), each supporting full-duplex asynchronous communication with programmable baud rates, parity, and stop bits. These SCIs can operate simultaneously-for example, one for debugging output, one for sensor telemetry, and one for host command reception-without shared resources or software arbitration overhead in the HD64F3687FPIV's hardware design.

What power-saving modes are available on the HD64F3687FPIV?

The HD64F3687FPIV provides four low-power modes: Sleep, Standby, Subsleep, and Subactive. In Subsleep mode, the main clock stops while the subclock (32.768 kHz) remains active, allowing RTC functions and wake-on-interrupt with typical current draw below 100 µA. Sleep mode halts the CPU but retains full RAM and register contents, enabling fast wake-up (<1 µs) for event-driven responsiveness in the HD64F3687FPIV.

Is the HD64F3687FPIV pin-compatible with other members of the H8/3687 Group?

Yes, the HD64F3687FPIV is pin-compatible with other 80-pin variants in the H8/3687 Group, including HD64F3687G and HD64N3687G, sharing identical pin arrangement, signal definitions, and electrical characteristics. This allows drop-in substitution during design iteration or sourcing transitions-provided the target variant's memory configuration (e.g., ROM vs. OTP) and temperature grade match the HD64F3687FPIV's specifications.