Renesas HD64F3664FXV

Overview

HD64F3664FXV from Renesas Electronics is a 16-bit single-chip microcomputer in the H8/3664 Group, featuring the H8/300H CPU core with 16 MB address space, 32 KB on-chip ROM, 2 KB RAM, and integrated peripherals including UART, timer/counters, and 8-channel 10-bit ADC. It operates at up to 20 MHz and targets embedded control in industrial instrumentation and factory automation systems.

For engineers reviewing the HD64F3664FXV datasheet, HD64F3664FXV pinout, HD64F3664FXV application, or HD64F3664FXV equivalent, key selection criteria include its 100-pin LQFP package, 3.3 V/5 V dual-voltage operation support, on-chip flash programming capability, and compatibility with H8/300H instruction set for legacy code migration.

Technical Context

The HD64F3664FXV implements the H8/300H CPU architecture with 16-bit data bus and 24-bit address bus, supporting both big-endian and little-endian data ordering via software configuration. Its memory map includes dedicated areas for on-chip ROM (0x000000–0x007FFF), RAM (0x008000–0x0087FF), and peripheral registers (0x00F000–0x00FFFF).

It integrates a system clock generator with crystal, ceramic resonator, or external clock input options; a subclock generator for real-time clock functions; and four power-down modes (Sleep, Standby, Subsleep, Subactive) controlled by SYSCR1/SYSCR2 registers to reduce active current to as low as 1.5 µA in Subsleep mode.

Key Specifications

Pinout & Package

HD64F3664FXV is housed in a 100-pin LQFP (14 mm × 14 mm, 0.5 mm pitch) package with exposed thermal pad. Pin assignments follow Renesas' standardized H8/3664 Group layout, supporting multiplexed functions per port and dedicated reset/NMI/interrupt inputs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with HD64F3664FXV, HD64F3687FV offers expanded memory and CAN but shares identical pinout and peripheral structure, while R5F566TEADFP delivers significantly higher compute throughput at the cost of increased power, complexity, and toolchain migration effort.

Availability

HD64F3664FXV is available at Aetrix Electronics and suitable for industrial automation, factory instrumentation, and legacy equipment modernization requiring stable component supply and long-term obsolescence management.

Supply support for HD64F3664FXV 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 automotive, industrial, and infrastructure markets.

The H8/3664 Group was designed for cost-sensitive, reliability-critical embedded control applications where deterministic real-time performance, low power, and long product life are essential - particularly in industrial equipment and instrumentation.

FAQ

What is the maximum operating frequency of the HD64F3664FXV?

The HD64F3664FXV operates at a maximum frequency of 20 MHz when supplied with 5 V. At this speed, it achieves a 50 ns instruction cycle time, supporting deterministic real-time execution for control loops and interrupt service routines. The device also supports lower frequencies (e.g., 8 MHz or 1 MHz) for reduced power consumption in battery-powered applications. HD64F3664FXV's clock generator accepts crystal, ceramic resonator, or external clock inputs to meet diverse system timing requirements.

Does the HD64F3664FXV support in-system programming of its on-chip ROM?

Yes, the HD64F3664FXV supports in-system programming (ISP) of its 32 KB on-chip flash ROM using the on-chip boot ROM and standard UART interface. This enables firmware updates without removing the device from the PCB. Programming requires entry into Boot Mode via specific pin configurations and uses Renesas' standard F-ZTAT protocol. HD64F3664FXV does not require external high-voltage programming signals, simplifying field maintenance and reducing test fixture complexity.

What power management features does the HD64F3664FXV offer?

The HD64F3664FXV provides four distinct low-power modes: Sleep, Standby, Subsleep, and Subactive. In Subsleep mode, current drops to 1.5 µA while retaining RAM contents and subclock operation for RTC functions. Power state transitions are controlled via SYSCR1 and SYSCR2 registers, and wake-up sources include external interrupts, timer events, and serial receive activity. HD64F3664FXV's power-down architecture allows precise energy budgeting in portable and remote monitoring applications.

Is the HD64F3664FXV pin-compatible with other devices in the H8/3664 Group?

Yes, the HD64F3664FXV is pin-compatible with other members of the H8/3664 Group, including HD64F3664, HD64N3664, and HD6433664, all sharing the same 100-pin LQFP package and identical pin functions. This allows direct substitution based on memory size, voltage grade, or temperature range without PCB redesign. HD64F3664FXV specifically denotes the industrial-grade (-40°C to +85°C) version with 5 V I/O tolerance and flash ROM, distinguishing it from mask-ROM variants.

What debug interfaces are supported by the HD64F3664FXV?

The HD64F3664FXV supports on-chip debugging via Renesas' standard E7 and E8 emulators through dedicated debug pins (NMI, P85–P87). These pins are multiplexed and reserved during debug sessions - for example, NMI becomes an emulator control signal and P85–P87 are unavailable as general I/O. HD64F3664FXV does not implement SWD or JTAG; instead, it relies on Renesas' proprietary H8/300H debug protocol, requiring compatible IDEs such as HEW (High-performance Embedded Workshop).