Renesas HD64N3664FPIV

Overview

HD64N3664FPIV from Renesas Electronics is a 16-bit single-chip microcomputer in the H8/3664 Group, featuring the H8/300H CPU core with 64 KB on-chip ROM, 4 KB RAM, and integrated peripherals including UART, timer/counters, and I²C-compatible serial interface. It operates at up to 20 MHz and targets embedded control applications requiring deterministic real-time response and low-power operation.

For engineers reviewing the HD64N3664FPIV datasheet, HD64N3664FPIV pinout, HD64N3664FPIV application, or HD64N3664FPIV equivalent, key selection criteria include its 80-pin PQFP package, 5 V single-supply operation, built-in flash programming support, and compatibility with Renesas' E7/E8 debug interfaces for firmware development and field updates.

Technical Context

The HD64N3664FPIV implements the H8/300H CPU architecture with full instruction set compatibility to the earlier H8/300, supporting 16-bit data paths and 24-bit addressing. It integrates system control modules (clock generators, power-down modes), on-chip memory (64 KB ROM, 4 KB RAM), and peripheral modules including three 16-bit timers, two UART channels, and an I²C-compatible serial interface.

Its clock system supports multiple sources: external crystal (up to 20 MHz), ceramic resonator, or external clock input; subclock generator enables 32.768 kHz RTC operation. Power management includes Sleep, Standby, Subsleep, and Subactive modes, with module-level standby control via MSTCR1 register.

Key Specifications

Pinout & Package

HD64N3664FPIV is housed in an 80-pin plastic quad flat pack (PQFP) 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 layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with HD64N3664FPIV, HD64F3664FPIV adds field-upgradable flash at higher unit cost and slightly lower data retention spec, while HD6433664FPIV removes I²C and one UART to reduce silicon area - both retain the same 80-pin PQFP package and 20 MHz performance envelope.

Availability

HD64N3664FPIV is available at Aetrix Electronics and suitable for industrial motor control, building automation panels, medical infusion pumps, and test & measurement fixtures requiring stable component supply and long-term production continuity.

Supply support for HD64N3664FPIV 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 infrastructure markets.

The H8/3664 Group - including HD64N3664FPIV - was designed for cost-sensitive, real-time embedded control applications requiring deterministic timing, low power, and integration of memory and peripherals in a single chip.

FAQ

What is the maximum operating frequency of the HD64N3664FPIV?

The HD64N3664FPIV supports a maximum operating frequency of 20 MHz when powered at 4.5–5.5 V. This frequency is achieved using an external crystal or clock source connected to XTAL1/XTAL2. At this speed, the H8/300H core delivers approximately 20 MIPS, enabling tight real-time loops for motor control or sensor processing. The HD64N3664FPIV datasheet specifies timing parameters such as instruction cycle time and bus access delays under these conditions.

Does the HD64N3664FPIV support in-system programming?

Yes, the HD64N3664FPIV supports on-board programming via its UART interface using Renesas' standard programming protocol. Although it contains mask ROM (not flash), the device includes dedicated boot-mode pins and internal programming logic that allow firmware images to be loaded during initial manufacturing or field replacement. This capability is documented in Section 7.3 of the HD64N3664FPIV Hardware Manual and requires no external programming hardware beyond a UART-to-USB adapter.

What power management modes does the HD64N3664FPIV offer?

The HD64N3664FPIV provides four configurable power-down 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 RTC alarm. Mode selection is controlled through SYSCR1 and SYSCR2 registers, and transitions are managed without external components. These modes are especially valuable in battery-powered instruments where HD64N3664FPIV serves as the primary system controller.

Is the HD64N3664FPIV pin-compatible with other members of the H8/3664 Group?

Yes, the HD64N3664FPIV shares the same 80-pin PQFP package and pin assignment with HD64F3664FPIV and HD6433664FPIV. All three variants maintain identical power, clock, reset, and I/O pin locations, enabling hardware design reuse across ROM, flash, and reduced-peripheral versions. However, functional differences - such as presence of I²C or second UART - mean firmware must be validated per variant even when PCB layout remains unchanged.

What debug interfaces are supported by the HD64N3664FPIV?

The HD64N3664FPIV is fully supported by Renesas' E7 and E8 in-circuit emulators. These tools provide real-time debugging, breakpoint setting, and register inspection via dedicated debug pins (NMI, P85–P87). When using the E7/E8, certain address ranges (e.g., H'7000–H'7FFF) and pins are reserved - details are specified in the HD64N3664FPIV Hardware Manual Appendix. No additional debug circuitry is required beyond connecting the emulator header to the designated pins.