Renesas HD64F3664HJ

Overview

HD64F3664HJ from Renesas Technology is a 16-bit single-chip microcomputer in the H8/300H Tiny Series, featuring an H8/300H CPU core with instruction compatibility to the H8/300, 64 KB on-chip flash ROM, 4 KB RAM, and integrated peripherals including Timer A, Timer V, I/O ports (P1–P8, PB), and clock pulse generators. It targets embedded control in industrial instrumentation and consumer electronics requiring deterministic real-time response.

For engineers reviewing the HD64F3664HJ datasheet, HD64F3664HJ pinout, HD64F3664HJ application, or HD64F3664HJ equivalent, key selection criteria include its 16-bit H8/300H architecture, 64 KB flash memory with on-board programming support, 4 KB SRAM, power-down modes (Sleep, Standby, Subsleep), and peripheral integration for timer-based control and I/O management in space-constrained designs.

Technical Context

The HD64F3664HJ implements the H8/300H CPU core with a 16-bit data bus and 24-bit address bus, supporting up to 16 MB address space. It includes dedicated system-control modules (clock generators, power-down controllers) and on-chip peripheral modules (Timer A for interval timing and clock output, Timer V for PWM and pulse generation, and eight I/O ports with configurable pull-up and mode registers).

Its flash memory subsystem supports in-system programming via boot mode or user program mode, with hardware/software protection and erase-block control. The device operates across multiple power-down states-Sleep, Standby, Subsleep, and Subactive-with prescaler-controlled clock domains enabling dynamic frequency scaling for low-power operation.

Key Specifications

Pinout & Package

HD64F3664HJ is housed in a 100-pin plastic QFP (PQFP100) package with 0.5 mm pitch, compliant with JEDEC MS-026. Pin functions are defined per port group (P1–P8, PB), clock inputs (XIN/XOUT, SUBCLK), reset (RES), and power (VCC, VSS).

Key Features

Applications

Equivalent & Alternatives

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

Compared with HD64F3664F and HD64N3664, the HD64F3664HJ uniquely combines 100-pin expandability, field-upgradable flash, and full peripheral complement-making it optimal for development, prototyping, and applications demanding firmware agility and I/O scalability.

Availability

HD64F3664HJ is available at Aetrix Electronics and suitable for industrial sensor nodes, home appliance control systems, smart meter interface modules, and POS terminal peripheral controllers requiring stable component supply and long-term design continuity.

Supply support for HD64F3664HJ 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 Technology Corp. (now part of Renesas Electronics Corporation) is a Japanese semiconductor manufacturer specializing in microcontrollers, analog, and power devices for industrial, automotive, and consumer markets.

The H8/3664 Group-including HD64F3664HJ-was designed for cost-sensitive, real-time embedded control applications requiring compact footprint, low power, and integrated peripherals without external support chips.

FAQ

What is the maximum operating frequency of the HD64F3664HJ?

The HD64F3664HJ supports a maximum main system clock frequency of 20 MHz when using an external crystal or ceramic resonator connected to the XIN/XOUT pins. This frequency enables deterministic execution of real-time control loops and supports baud-rate generation for UART communication up to 115.2 kbps. The actual achievable frequency depends on the selected clock source and board layout stability.

Does the HD64F3664HJ support in-system programming of its flash memory?

Yes, the HD64F3664HJ supports in-system programming (ISP) of its 64 KB on-chip flash memory through two modes: boot mode (using dedicated pins at reset) and user program mode (executing flash write/erase routines from RAM). Both modes require proper voltage and timing conditions, and flash protection registers must be configured to permit writes. This capability allows firmware updates without removing the HD64F3664HJ from the target board.

How many I/O pins does the HD64F3664HJ provide, and how are they organized?

The HD64F3664HJ provides 56 programmable I/O pins distributed across Ports P1–P8 and Port B. Port P1 (8 pins), P2 (8), P5 (8), P7 (8), P8 (8), and Port B (16) are individually configurable via mode, control, and data registers. Each port supports input/output direction setting, data read/write, and optional internal pull-up resistors-enabling flexible interface design for sensors, displays, and actuators without external logic.

What power-down modes are available on the HD64F3664HJ, and what is retained in each?

The HD64F3664HJ offers four power-down modes: Sleep (CPU halted, clocks stopped, RAM retained), Standby (main clock off, subclock active, RAM retained), Subsleep (subclock running, RAM retained, lowest current draw), and Subactive (subclock active, limited peripheral operation). In all modes except Sleep, the HD64F3664HJ retains register contents and RAM data, allowing fast wake-up with preserved context-critical for battery-powered applications requiring rapid response to events.

Is the HD64F3664HJ pin-compatible with other members of the H8/3664 Group?

No, the HD64F3664HJ is not pin-compatible with other H8/3664 Group variants such as HD64F3664F (80-pin) or HD64N3664 (same 100-pin package but mask-ROM). While the HD64F3664HJ shares the same 100-pin PQFP package with HD64N3664, functional differences-such as flash vs. ROM and subtle timing or reset behavior variations-preclude drop-in replacement without validation. Always verify pin mapping and electrical characteristics before substitution.