Renesas HD64F3694GFXV

Overview

HD64F3694GFXV from Renesas Electronics is a 16-bit single-chip microcomputer in the H8/3694 Group, featuring the H8/300H CPU core with 16 MB address space, 32 KB on-chip ROM, and 2 KB RAM. It supports multiple power-down modes (Sleep, Standby, Subsleep, Subactive), operates at up to 20 MHz, and integrates UART, timer/counters, and 8-bit I/O ports for embedded control applications in industrial equipment and office automation.

For engineers reviewing the HD64F3694GFXV datasheet, HD64F3694GFXV pinout, HD64F3694GFXV application, or HD64F3694GFXV equivalent, key selection considerations include its 100-pin PQFP package, 3.3 V/5 V dual-voltage operation capability, on-chip flash programming support, and compatibility with H8/300H instruction set for legacy code migration and real-time deterministic control.

Technical Context

The HD64F3694GFXV implements the H8/300H CPU architecture with full instruction-set compatibility to the earlier H8/300, enabling reuse of existing firmware assets. Its memory map includes 16 MB linear addressing, with on-chip 32 KB ROM and 2 KB RAM mapped into fixed regions, and supports external bus expansion via 16-bit data and 24-bit address buses.

Power management is handled by dedicated system control registers (SYSCR1/SYSCR2) and module standby control (MSTCR1), enabling granular clock gating per peripheral - including UART, timers, and I/O ports - to achieve sub-mA current draw in Sleep mode while retaining RAM contents and wake-up capability via external interrupt or subclock event.

Key Specifications

Pinout & Package

HD64F3694GFXV 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 fine-pitch surface-mount assembly and provides full access to address/data buses, control signals, and peripheral I/O.

Key Features

Applications

Equivalent & Alternatives

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

Compared with HD64F3694GFXV, HD64F3687GFXV offers lower memory and peripheral integration at reduced cost, while R5F100PLAFB provides significantly greater resources and modern low-power architecture - making HD64F3694GFXV optimal for maintaining legacy H8-based systems with stable feature set and supply chain.

Availability

HD64F3694GFXV is available at Aetrix Electronics and suitable for industrial automation, office equipment, and test & measurement applications requiring stable component supply, long-term lifecycle support, and verified second-source alternatives.

Supply support for HD64F3694GFXV 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 enterprise markets.

The H8/3694 Group, including HD64F3694GFXV, was designed for cost-effective, deterministic real-time control in resource-constrained embedded systems - emphasizing code compatibility, low-power operation, and minimal external component requirements.

FAQ

What is the maximum operating frequency of the HD64F3694GFXV?

The HD64F3694GFXV supports a maximum operating frequency of 20 MHz when driven by an external crystal or clock source. This frequency determines the instruction execution speed and timing precision for real-time tasks. The device's internal clock generator allows configuration of prescaler ratios to derive lower-frequency clocks for peripherals. At 20 MHz, the HD64F3694GFXV achieves a 50 ns minimum instruction cycle time, enabling responsive control loop performance in applications such as motor drives and sensor interfaces.

Does the HD64F3694GFXV support in-system programming of its on-chip ROM?

Yes, the HD64F3694GFXV supports in-system programming of its 32 KB on-chip ROM via UART using the built-in boot mode. When configured with specific pin states at power-on, the HD64F3694GFXV enters bootloader mode and accepts firmware updates over UART0 without requiring external programming hardware. This capability enables field firmware upgrades and simplifies manufacturing programming. The HD64F3694GFXV's FLMCR1 and FENR registers manage flash write/erase operations, and the process requires precise voltage and timing conditions as specified in the hardware manual.

What power management modes does the HD64F3694GFXV offer?

The HD64F3694GFXV provides four distinct power-down modes: Sleep, Standby, Subsleep, and Subactive. Each mode disables different clock domains and peripheral blocks to minimize current draw while preserving required state - for example, Sleep mode retains RAM contents and allows wake-up via any enabled interrupt, while Subsleep uses the 32.768 kHz subclock for RTC functions at microamp-level current. These modes are controlled through SYSCR1, SYSCR2, and MSTCR1 registers. Engineers use the HD64F3694GFXV's power management features to extend battery life in portable instruments and reduce thermal load in fanless industrial enclosures.

Is the HD64F3694GFXV pin-compatible with other devices in the H8/3694 Group?

No, the HD64F3694GFXV is not universally pin-compatible across the entire H8/3694 Group. While it shares the same 100-pin PQFP package with several variants (e.g., HD64F3694, HD64F3694G), differences in peripheral enablement, I/O multiplexing, and voltage tolerance exist between suffix variants. For example, the HD64F3694GFXV includes specific bonding options for 3.3 V/5 V dual-rail operation not present in base HD64F3694 versions. Pin compatibility must be verified per variant using the "Pin Functions" section of the H8/3694 Group Hardware Manual - direct substitution without validation may result in functional or electrical mismatch.

What development tools are supported for the HD64F3694GFXV?

The HD64F3694GFXV is supported by Renesas' legacy H8 toolchain, including the H8S/H8/300 Series C/C++ Compiler (REJ10B0058), High-Performance Embedded Workshop 3 IDE (REJ10B0026), and E8 in-circuit emulator. Debugging is possible via on-chip emulation pins (NMI, P85–P87), though these are reserved when the E8 is active. The HD64F3694GFXV also works with third-party tools supporting the H8/300H instruction set and BDM/JTAG-like debug protocols. Application notes such as REJ05B0464 provide guidance on integrating the HD64F3694GFXV into automated build and test environments.