Renesas HD6473657HV

Overview

HD6473657HV from Renesas Technology Corp. is a 16-bit single-chip microcontroller in the H8/3657 Series, featuring an H8/300L CPU core, five on-chip timers (including Timer A, B1, V, X, and watchdog), a 14-bit PWM module, dual-channel serial communication interface (SCI), and a 10-bit A/D converter. It operates at up to 20 MHz and targets real-time embedded control applications such as motor drive and industrial automation.

For engineers reviewing the HD6473657HV datasheet, HD6473657HV pinout, HD6473657HV application, or HD6473657HV equivalent, key selection criteria include its 100-pin PQFP package, integrated PWM timing resolution, SCI baud rate flexibility, low-power sleep/standby modes, and compatibility with H8/300L instruction set for legacy code reuse.

Technical Context

The HD6473657HV implements the H8/300L CPU architecture with full instruction set compatibility to the earlier H8/300, supporting 16-bit data paths and 24-bit addressing. Its peripheral integration includes independent clock prescalers for each timer, configurable SCI baud generation via internal BRG, and A/D conversion with software-started or timer-triggered sampling.

Power management is handled through six distinct operating modes-Active, Subactive, Sleep, Standby, Watch, and Subsleep-with oscillator settling times and clock gating explicitly defined per mode. The device supports PROM-mode programming via external socket adapter and features on-chip RAM (2 KB) and ROM (128 KB mask ROM).

Key Specifications

Pinout & Package

HD6473657HV is housed in a 100-pin plastic quad flat pack (PQFP) with 0.65 mm lead pitch, compliant with JEDEC MS-026. Pin functions are multiplexed across I/O ports (Ports 1, 2, 3, 5–9, B) and dedicated peripheral signals including XTAL/EXTAL, RESET, IRQ, and PWM output pins.

Key Features

Applications

Equivalent & Alternatives

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

Compared with HD6473657HV, HD64F3657FV trades mask-ROM permanence for flash flexibility, while R5F3657EDFP replaces the entire 16-bit H8 platform with a 32-bit architecture-making HD6473657HV optimal for cost-sensitive, high-volume, fixed-function control where legacy code stability and minimal BOM count are critical.

Availability

HD6473657HV is available at Aetrix Electronics and suitable for industrial motor control, PLC I/O modules, factory sensor nodes, and energy metering front-ends requiring stable component supply and long-term production continuity.

Supply support for HD6473657HV 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. was formed in 2003 through the merger of Hitachi and Mitsubishi Electric's semiconductor operations, specializing in microcontrollers, analog, and power devices for industrial and embedded markets.

The H8/3657 Series-including HD6473657HV-was designed for cost-effective, real-time control in resource-constrained systems where deterministic timing, low power, and peripheral integration outweigh raw processing throughput.

FAQ

What is the maximum operating frequency of the HD6473657HV?

The HD6473657HV supports a maximum system clock frequency of 20 MHz, achieved using an external crystal (1–20 MHz) connected to the XTAL/EXTAL pins. At this frequency, the CPU executes instructions in 50 ns cycles, enabling tight real-time loop timing for motor control and sensor sampling tasks. The HD6473657HV datasheet specifies timing margins for all peripheral modules-including A/D conversion and SCI baud generation-at this maximum clock rate.

Does the HD6473657HV include on-chip flash memory?

No, the HD6473657HV contains 128 KB of mask-programmed ROM, not flash memory. This makes it suitable for high-volume, fixed-firmware applications where code immutability, cost reduction, and resistance to accidental overwrite are priorities. For flash-based alternatives, consider the HD64F3657FV, which shares the same pinout and peripheral set but replaces mask ROM with reprogrammable flash. The HD6473657HV itself requires external programming during wafer fabrication.

How many analog input channels does the HD6473657HV support?

The HD6473657HV integrates a 10-bit successive-approximation A/D converter with eight analog input channels (AD0–AD7), multiplexed onto Port 5 pins. These channels support both single-ended and pseudo-differential configurations, with conversion triggered by software command or Timer V overflow. The HD6473657HV's A/D module includes built-in sample-and-hold and reference voltage options (AVCC or internal bandgap), enabling accurate sensor signal digitization without external components.

What power-saving modes are available on the HD6473657HV?

The HD6473657HV offers six configurable power-down modes: Sleep, Standby, Watch, Subsleep, Subactive, and Active (Medium-Speed). In Standby mode, current drops below 10 µA while preserving RAM contents and allowing wake-up via IRQ or reset. Subsleep mode maintains timer accuracy for periodic wake-ups at ~20 µA. Each mode has documented oscillator settling times and peripheral disable rules-critical for designing battery-powered nodes where the HD6473657HV serves as the sole system controller.

Is the HD6473657HV pin-compatible with other H8/3657 Series devices?

Yes, the HD6473657HV shares the same 100-pin PQFP package and pin assignment with other members of the H8/3657 family, including HD64F3657FV and HD6433657. This allows hardware design reuse across mask-ROM and flash variants. However, differences in memory type (mask ROM vs. flash), reset behavior, and boot configuration mean firmware and initialization sequences may require adjustment-even though the HD6473657HV pinout remains identical across the series.