Renesas HD64F3694FYIV

Overview

HD64F3694FYIV from Renesas Electronics is a 16-bit single-chip microcomputer in the H8/3694 Group, featuring an H8/300H CPU core, 128 KB on-chip ROM, 8 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 in industrial instrumentation and legacy automation systems.

For engineers reviewing the HD64F3694FYIV datasheet, HD64F3694FYIV pinout, HD64F3694FYIV application, or HD64F3694FYIV equivalent, key selection considerations include its 100-pin PQFP 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 HD64F3694FYIV implements the H8/300H CPU architecture with 24-bit addressing, supporting both little-endian and big-endian data access modes. Its memory map includes dedicated areas for on-chip ROM (128 KB), RAM (8 KB), peripheral registers, and user-defined vectors.

It integrates multiple clock sources: main system clock (up to 20 MHz via crystal or external input), subclock (32.768 kHz for RTC), and prescalers (S and W) enabling flexible low-power mode transitions including Sleep, Standby, Subsleep, and Subactive modes - all controlled via SYSCR1/SYSCR2 and MSTCR1 registers.

Key Specifications

Pinout & Package

HD64F3694FYIV is housed in a 100-pin PQFP (Plastic Quad Flat Package) with 0.65 mm lead pitch and 14 mm × 20 mm body size. The package supports surface-mount assembly and provides thermal dissipation suitable for industrial ambient temperatures (−20°C to +75°C).

Key Features

Applications

Equivalent & Alternatives

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

Compared with HD64F3694FYIV, the HD64F3687FV offers lower memory and I/O resources in a smaller package, while the HD64F3692FV retains the same footprint but sacrifices flash programmability - making HD64F3694FYIV the only option supporting full in-field firmware updates within this pinout family.

Availability

HD64F3694FYIV is available at Aetrix Electronics and suitable for industrial PLC I/O modules, legacy CNC controllers, and building automation panels requiring stable component supply and long-term lifecycle support.

Supply support for HD64F3694FYIV 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 H8/3694 Group - including HD64F3694FYIV - was designed for cost-sensitive, high-reliability embedded control applications requiring long-lifecycle support and backward compatibility with legacy H8/300-based systems.

FAQ

What is the maximum operating frequency of the HD64F3694FYIV?

The HD64F3694FYIV supports a maximum system clock frequency of 20 MHz, achievable using either an external crystal resonator connected to XTAL1/XTAL2 or an external clock source applied to the EXTAL pin. This frequency enables 20 MIPS performance for real-time control tasks, and timing-critical peripherals like UART baud rate generators and timer prescalers are derived directly from this clock domain.

Does the HD64F3694FYIV support in-system programming of its on-chip ROM?

Yes, the HD64F3694FYIV supports in-system programming of its 128 KB on-chip flash ROM through multiple methods: boot-mode serial programming via UART, on-chip emulator (E7/E8) debug interface, or application firmware using FLMCR1/FLMCR2 control registers. This eliminates the need for external programmers in production or field update scenarios, and HD64F3694FYIV's flash endurance is rated for 10,000 write/erase cycles per block.

What power-saving modes are available on the HD64F3694FYIV?

The HD64F3694FYIV implements four hardware-controlled low-power modes: Sleep (CPU halted, peripherals active), Standby (CPU and most peripherals halted, RTC running), Subsleep (subclock active only), and Subactive (subclock driving limited logic). Entry and exit are managed via SYSCR1/SYSCR2 registers, and current drops to under 10 µA in Standby mode - critical for battery-backed applications where HD64F3694FYIV maintains timekeeping and wake-on-interrupt capability.

Is the HD64F3694FYIV pin-compatible with other members of the H8/3694 Group?

Yes, the HD64F3694FYIV shares the same 100-pin PQFP package and pin assignment with other H8/3694 variants including HD64F3694, HD64F3694G, and HD64N3694G. Pin functions - including power, reset, clock, I/O ports, and peripheral signals - are electrically and logically identical across these variants, enabling drop-in replacement where memory size or temperature grade permits.

What development tools are officially supported for the HD64F3694FYIV?

Renesas officially supports the E7 and E8 on-chip emulators for HD64F3694FYIV firmware development and debugging. These tools provide real-time trace, breakpoint, and memory inspection capabilities. Additionally, the H8S/H8/300 Series C/C++ Compiler (REJ10B0058), High-Performance Embedded Workshop IDE, and H8/300H Software Manual (REJ09B0213) are required for full toolchain integration - all documented in the HD64F3694FYIV hardware manual Rev.5.00.