Renesas HD64F3694FYV

Overview

HD64F3694FYV from Renesas Electronics is a 16-bit single-chip microcomputer in the H8/300H Tiny Series, featuring an H8/300H CPU core with H8/300 instruction set compatibility, 128 KB on-chip ROM, 8 KB RAM, and integrated peripherals including UART, timer modules, and 8-channel 10-bit ADC - deployed in industrial control panels requiring deterministic real-time response.

For engineers reviewing the HD64F3694FYV datasheet, HD64F3694FYV pinout, HD64F3694FYV application, or HD64F3694FYV equivalent, key selection considerations include operating voltage range (3.0–5.5 V), maximum CPU frequency (20 MHz), ROM write endurance (10,000 cycles), and support for low-power sleep/subsleep modes in embedded instrumentation designs.

Technical Context

The HD64F3694FYV implements the H8/300H CPU architecture with 24-bit address space, supporting both big-endian memory layout and 16-bit data paths. It integrates a system clock generator with crystal, ceramic resonator, or external clock input options, plus independent subclock circuitry for RTC operation at 32.768 kHz.

Power management includes four low-power modes - Sleep, Standby, Subsleep, and Subactive - controlled via SYSCR1/SYSCR2 registers and modulated by module-level standby enable bits in MSTCR1. Reset handling supports both manual and watchdog-initiated recovery with vectorized exception processing.

Key Specifications

Pinout & Package

HD64F3694FYV is housed in a 100-pin LQFP (14 mm × 14 mm, 0.5 mm pitch) package with exposed thermal pad. Pin functions are defined per the H8/3694 Group Hardware Manual Rev.5.00 (2005), including dedicated reset, clock input (XIN/XOUT), subclock (SCK/SCOUT), and multifunction I/O ports P0–P11.

Key Features

Applications

Equivalent & Alternatives

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

Compared with HD64F3694FYV, HD64F3687FV provides identical architecture with scaled memory for simpler applications, while R5F100LEAFB delivers next-generation power efficiency and debug capability at the cost of software requalification.

Availability

HD64F3694FYV is available at Aetrix Electronics and suitable for industrial control panels, medical infusion devices, automotive body electronics, and smart energy metering requiring stable component supply across extended production lifecycles.

Supply support for HD64F3694FYV 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 global semiconductor leader specializing in microcontrollers, analog, power, and SoC solutions for industrial, automotive, and infrastructure markets.

The HD64F3694FYV belongs to the H8/3694 Group - a family of cost-optimized 16-bit MCUs designed for deterministic real-time control in resource-constrained embedded systems with legacy code compatibility requirements.

FAQ

What is the maximum operating frequency of the HD64F3694FYV?

The HD64F3694FYV operates at a maximum CPU frequency of 20 MHz across its specified supply voltage range of 3.0 V to 5.5 V. This frequency is achieved using the on-chip system clock generator with an external crystal or resonator connected to the XIN/XOUT pins. The HD64F3694FYV delivers 12.5 MIPS performance, enabling tight real-time control loops in applications such as motor drive feedback and sensor data acquisition.

Does the HD64F3694FYV support in-system programming of its on-chip ROM?

Yes, the HD64F3694FYV supports in-system programming (ISP) of its 128 KB on-chip flash ROM via on-board programming modes activated using the BOOT pin configuration. The device allows sector-erase and byte/word programming operations without removing it from the target board. HD64F3694FYV's FLMCR1/FLMCR2 and EBR1 registers manage erase and write sequences, with 10,000 guaranteed erase/write cycles per block.

What low-power modes does the HD64F3694FYV provide, and how do they differ?

The HD64F3694FYV offers four distinct low-power modes: Sleep, Standby, Subsleep, and Subactive. Sleep mode halts the main clock while preserving RAM and register contents; Standby stops all clocks including subclock; Subsleep retains subclock operation for RTC wake-up; Subactive reduces CPU frequency while keeping peripherals active. HD64F3694FYV enters these modes via SYSCR1/SYSCR2 register writes and wakes on external interrupt, NMI, or RTC alarm.

Can the HD64F3694FYV's ADC be used simultaneously with UART communication?

Yes, the HD64F3694FYV's 8-channel 10-bit ADC and dual UART modules operate independently and can function concurrently. The ADC uses its own trigger sources (software, timer, or external event), while UART0 and UART1 share no critical resources with the ADC subsystem. HD64F3694FYV's peripheral clock gating and interrupt prioritization allow simultaneous sensor sampling and serial telemetry transmission without conflict, provided proper register initialization and interrupt nesting is implemented.

Is the HD64F3694FYV pin-compatible with other members of the H8/3694 Group?

No, the HD64F3694FYV is not universally pin-compatible across the H8/3694 Group. While it shares the 100-pin LQFP package with variants like HD64F3694G, differences in NC pin allocation, power pin placement (e.g., VCC/VSS count), and peripheral multiplexing mean PCB layout must be verified against the specific variant's pin function table. HD64F3694FYV's pinout matches only the FYV suffix variants documented in the H8/3694 Group Hardware Manual Rev.5.00.