Renesas HD64F3684GHV

Overview

HD64F3684GHV 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 applications requiring compact footprint and low-power operation.

For engineers reviewing the HD64F3684GHV datasheet, HD64F3684GHV pinout, HD64F3684GHV application, or HD64F3684GHV equivalent, key selection criteria include its 80-pin PQFP package, 5 V operation, on-chip ROM programming capability, and support for sleep/standby power-down modes in resource-constrained industrial and consumer systems.

Technical Context

The HD64F3684GHV implements the H8/300H CPU architecture with 24-bit address space, supporting both byte and word memory access. Its system clock generator accepts crystal (1–20 MHz), ceramic resonator, or external clock input, and includes independent subclock circuitry for real-time clock functions using a 32.768 kHz source.

Power management is handled via four low-power modes-Sleep, Standby, Subsleep, and Subactive-with configurable module-level standby control. Interrupt handling supports 64 vectors, including external edge-triggered inputs and internal peripheral sources, with priority-based nesting and programmable edge detection per channel.

Key Specifications

Pinout & Package

HD64F3684GHV is housed in an 80-pin PQFP (Plastic Quad Flat Package) with 0.65 mm lead pitch and 14 mm × 20 mm body size. The package supports standard reflow soldering and provides mechanical stability for industrial board environments.

Key Features

Applications

Equivalent & Alternatives

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

Compared with HD64F3684GHV, HD64F3687G offers doubled memory without layout changes, while HD64F3694HV adds CAN and ADC at the cost of increased complexity and qualification effort - making HD64F3684GHV optimal for cost-sensitive, ROM-limited control tasks where those features are unnecessary.

Availability

HD64F3684GHV is available at Aetrix Electronics and suitable for industrial motor control, consumer appliance interface, building automation sensor nodes, and test & measurement front-end applications requiring stable component supply and long-term obsolescence planning.

Supply support for HD64F3684GHV 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 manufacturer specializing in microcontrollers, analog, power, and SoC solutions for industrial, automotive, and infrastructure markets.

The H8/300H Tiny Series-including HD64F3684GHV-was designed for cost-effective, low-power embedded control in appliances, industrial equipment, and instrumentation where high integration and 5 V robustness are critical.

FAQ

What is the maximum operating frequency of the HD64F3684GHV?

The HD64F3684GHV supports a maximum system clock frequency of 20 MHz when using an external crystal or resonator. This frequency is achieved with proper decoupling and PCB layout per Renesas' hardware design guidelines. At 20 MHz, the HD64F3684GHV delivers approximately 12.5 MIPS performance, sufficient for real-time control loops in motor drives and appliance systems. The internal clock generator includes prescalers to derive lower-frequency clocks for peripherals.

Does the HD64F3684GHV include on-chip flash or EEPROM memory?

No, the HD64F3684GHV uses mask-programmed ROM for program storage-not flash or EEPROM. Its 64 KB ROM is programmed during wafer fabrication and cannot be reprogrammed in-system. For development, Renesas provided external programming tools and evaluation boards. Data storage relies on the 4 KB on-chip RAM, which is volatile; persistent data must be managed externally via serial EEPROM or FRAM if required in the final application.

What power management modes does the HD64F3684GHV support?

The HD64F3684GHV supports four low-power modes: Sleep, Standby, Subsleep, and Subactive. In Standby mode, current consumption drops below 10 μA while retaining RAM contents and allowing wake-up via external interrupt or subclock alarm. Subsleep retains subclock operation and RTC functionality at ~15 μA. These modes are controlled via SYSCR1/SYSCR2 registers and enable energy-efficient operation in battery-powered sensors and portable instruments using the HD64F3684GHV.

Is the HD64F3684GHV pin-compatible with other devices in the H8/300H Tiny Series?

Yes, the HD64F3684GHV shares the same 80-pin PQFP package and pinout with several members of the H8/300H Tiny Series, including HD64F3687G and HD64F3684. This allows board-level reuse across variants differing in memory size or peripheral configuration. However, functional differences-such as absence of CAN in HD64F3684GHV versus HD64F3694HV-require firmware adaptation even when pinouts match. Always verify register map and peripheral enable bits before substitution.

What development tools are supported for the HD64F3684GHV?

Renesas officially supported the HD64F3684GHV with the High-Performance Embedded Workshop (HEW) IDE, H8/300H C/C++ compiler (REJ10B0058), and E8 in-circuit emulator. Debugging used the on-chip emulator interface via P85–P87 pins, though these were reserved during emulation. Application notes such as REJ05B0464 covered compiler usage, and ADE-502-055 documented single-supply on-board programming. While modern toolchains no longer actively support this legacy part, archived binaries and documentation remain accessible via Renesas' legacy portal for maintenance of existing HD64F3684GHV-based systems.