Renesas HD64F3672FX

Overview

HD64F3672FX from Renesas Electronics is a 16-bit single-chip microcomputer in the H8/3672 Group, featuring the H8/300H CPU core with instruction compatibility to H8/300, 32 KB on-chip flash memory, 2 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 HD64F3672FX datasheet, HD64F3672FX pinout, HD64F3672FX application, or HD64F3672FX equivalent, key selection considerations include its 80-pin PQFP package, flash programmability in-system, low-power sleep/standby modes, and support for crystal or external clock input - all critical for cost-sensitive, space-constrained MCU designs requiring field-upgradable firmware.

Technical Context

The HD64F3672FX implements the H8/300H CPU architecture with 16-bit data bus and 24-bit address bus, enabling access to up to 16 MB of address space. It integrates on-chip system control modules including clock pulse generators with crystal/ceramic resonator support and prescaler S for frequency division.

Power management includes three low-power modes - Sleep, Standby, and Subsleep - controlled via SYSCR1/SYSCR2 registers and module-level standby via MSTCR1. Flash memory supports in-application programming (IAP) with hardware/software protection and erase-verify functionality.

Key Specifications

Pinout & Package

HD64F3672FX is housed in an 80-pin Plastic Quad Flat Package (PQFP) with 0.65 mm lead pitch, compliant with JEDEC MS-026. The package supports reflow soldering and provides full signal, power, and ground connectivity for standalone MCU operation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with HD64F3672FX, HD64F3682F offers double flash/RAM in the same 80-pin package for scalability, while HD64F3664F trades memory and I/O for lower cost and smaller footprint - neither is pin-compatible with HD64F3672FX unless board redesign accommodates 64-pin LQFP.

Availability

HD64F3672FX is available at Aetrix Electronics and suitable for industrial motor control, home appliance controllers, point-of-sale terminals, and building automation sensor nodes requiring stable component supply and long-term manufacturability.

Supply support for HD64F3672FX 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, and power devices for industrial, automotive, and consumer markets.

The HD64F3672FX belongs to the H8/3672 Group - a family of 16-bit MCUs designed for cost-effective, low-power embedded control in appliances, industrial equipment, and instrumentation where flash programmability and peripheral integration are essential.

FAQ

What is the maximum operating frequency of the HD64F3672FX?

The HD64F3672FX operates at a maximum frequency of 20 MHz when using an external crystal or clock source. This frequency is supported across the full industrial temperature range (−40°C to +85°C) and enables instruction execution at 50 ns per cycle. The device's clock pulse generator accepts 1–20 MHz crystals directly, and the internal prescaler allows flexible division for peripheral timing. HD64F3672FX maintains timing compliance under specified VCC = 4.5–5.5 V conditions.

Does the HD64F3672FX support in-system programming of its flash memory?

Yes, the HD64F3672FX supports in-system programming (ISP) of its 32 KB on-chip flash memory via two modes: boot mode (using on-chip ROM loader) and user program mode (executing custom firmware). Programming includes page erase, byte/word write, and automatic verify operations. HD64F3672FX implements hardware lock bits and software protection registers to prevent unauthorized writes, and error protection detects failed erase/write cycles.

What low-power modes does the HD64F3672FX provide, and how do they differ?

The HD64F3672FX offers three low-power modes: Sleep (CPU halted, peripherals active), Standby (CPU and most peripherals halted, RAM retained), and Subsleep (deep power-down with <10 µA current, only wakeup sources active). Mode entry is controlled by SYSCR1/SYSCR2 registers, and wakeup from Subsleep requires external interrupt or reset. HD64F3672FX retains register contents and I/O states across Sleep and Standby but resets most logic in Subsleep.

Is the HD64F3672FX pin-compatible with other members of the H8/3672 Group?

The HD64F3672FX shares the same 80-pin PQFP package and pin assignment with HD64F3682F, making them pin-compatible replacements. However, it is not pin-compatible with lower-pin-count variants like HD64F3664F (64-pin LQFP) or HD64F3670F (80-pin but different peripheral mapping). HD64F3672FX pin functions are defined in Section 1.3 and 1.4 of the Hardware Manual Rev.4.00, and NC pins must remain unconnected per design guidance.

What development tools are officially supported for the HD64F3672FX?

Renesas officially supports the E7 and E8 on-chip emulators for HD64F3672FX firmware development and debugging. These tools require NMI pin reservation and restrict access to memory areas H'4000–H'4FFF and H'F780–H'FB7F. HD64F3672FX is also compatible with the High-Performance Embedded Workshop 3 IDE, C/C++ compiler REJ10B0058, and simulator/debugger ADE-702-282 - all documented in the H8/3672 Group related manuals list.