Renesas HD64F3684GDV

Overview

HD64F3684GDV from Renesas Electronics is a 16-bit single-chip microcomputer in the H8/300H Tiny Series, featuring an H8/300H CPU core with instruction set compatibility to H8/300, 64 KB on-chip ROM, 4 KB RAM, and integrated peripherals including UART (SCI), timer modules, and I/O ports. It operates at up to 20 MHz and targets embedded control applications requiring deterministic real-time response.

For engineers reviewing the HD64F3684GDV datasheet, HD64F3684GDV pinout, HD64F3684GDV application, or HD64F3684GDV 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 HD64F3684GDV implements the H8/300H CPU architecture with 24-bit address space, supporting both byte- and word-aligned memory access. Its system clock generator accepts crystal (1–20 MHz), ceramic resonator, or external clock input, and includes subclock circuitry for 32.768 kHz RTC support.

Power management includes four low-power modes-Sleep, Standby, Subsleep, and Subactive-with module-level standby control via MSTCR1/MSTCR2 registers. Reset handling supports both power-on and external reset inputs, with configurable NMI and interrupt vectoring across 128 exception sources.

Key Specifications

Pinout & Package

HD64F3684GDV is housed in an 80-pin PQFP (Plastic Quad Flat Package) with 0.65 mm lead pitch, JEDEC MS-026 compliant, thermal pad optional. Pin layout follows H8/3687 Group standard configuration with dedicated power, ground, clock, reset, and multiplexed peripheral I/O assignments.

Key Features

Applications

Equivalent & Alternatives

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

Compared with HD64F3684GDV, HD64F3687G offers double memory resources within identical footprint and timing, while HD64F3694F introduces architectural enhancements at the cost of minor voltage interface adjustments - both serve as functional alternatives where memory or peripheral scalability is prioritized over strict drop-in replacement.

Availability

HD64F3684GDV is available at Aetrix Electronics and suitable for industrial motor control, building automation panels, medical diagnostic instruments, and test & measurement equipment requiring stable component supply and long-term obsolescence management.

Supply support for HD64F3684GDV 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 automotive, industrial, and IoT applications.

The H8 Family/H8/300H Tiny Series-including HD64F3684GDV-is designed for cost-sensitive, high-reliability embedded control applications where deterministic real-time performance, low power consumption, and mature toolchain support are essential.

FAQ

What is the maximum operating frequency of the HD64F3684GDV?

The HD64F3684GDV supports a maximum system clock frequency of 20 MHz, achievable using an external crystal, ceramic resonator, or clock source connected to the XTAL/EXTAL pins. This frequency enables approximately 10 million instructions per second (MIPS) execution performance, sufficient for real-time control tasks such as motor commutation and sensor data processing in the HD64F3684GDV-based systems.

Does the HD64F3684GDV support in-circuit debugging?

Yes, the HD64F3684GDV supports in-circuit debugging via Renesas E7 or E8 emulators, though with specific pin reservations: the NMI pin and P85–P87 are dedicated to emulator functions and become unavailable for user I/O during debug sessions. The HD64F3684GDV also supports on-board programming through SCI channel 3 (P21/P22) in boot mode, enabling firmware updates without removing the device from the PCB.

What power supply voltage range is required for reliable operation of the HD64F3684GDV?

The HD64F3684GDV requires a nominal 5 V supply with an allowable operating range of 4.5 V to 5.5 V. This specification ensures compatibility with standard TTL/CMOS logic families and legacy industrial power rails. Operation outside this range may cause undefined behavior, register corruption, or failure to execute the reset sequence correctly - all verified in the HD64F3684GDV electrical characteristics table under DC characteristics.

How many I/O pins does the HD64F3684GDV provide, and are they multiplexed?

The HD64F3684GDV provides 69 general-purpose CMOS I/O pins in its 80-pin PQFP package, with extensive peripheral function multiplexing. Each port pin can be configured as GPIO or assigned to UART, timer capture/compare, external interrupt, or clock output functions via associated control registers. Unused input pins must be externally pulled high or low to prevent floating states and unintended current draw - a requirement explicitly documented for the HD64F3684GDV in Renesas' hardware manual.

Is the HD64F3684GDV RoHS-compliant and suitable for modern production?

Yes, the HD64F3684GDV is RoHS-compliant and manufactured under Renesas Electronics' environmental compliance program. While originally introduced prior to full RoHS enforcement, current production lots meet EU Directive 2011/65/EU requirements for restricted substances. Aetrix Electronics supplies only traceable, RoHS-certified HD64F3684GDV units with full material declarations and lifecycle documentation to support industrial and medical product certifications.