Renesas HD6473294PJ16

Overview

HD6473294PJ16 from Hitachi is a single-chip 16-bit microcontroller in the H8/3294 series, featuring an H8/300 CPU core, 32 KB on-chip mask-ROM, 1 KB RAM, three timer modules (16-bit free-running, dual 8-bit), 8-channel 10-bit A/D converter, serial communication interface (UART/SIO), and 56 I/O pins - used in industrial motor control, HVAC actuator systems, and embedded appliance controllers.

For engineers reviewing the HD6473294PJ16 datasheet, HD6473294PJ16 pinout, HD6473294PJ16 application, or HD6473294PJ16 equivalent, key selection criteria include ROM/RAM size, integrated A/D resolution and channel count, timer architecture (input capture/output compare), serial interface mode support, and I/O drive capability in single-chip mode.

Technical Context

The HD6473294PJ16 implements the H8/300 CPU core with 16-bit data bus and 24-bit address space, supporting 16-MHz max operation via internal clock divider and external crystal or ceramic resonator. It operates in single-chip mode only - no external bus expansion - with memory-mapped peripheral registers and vectored interrupt handling across 64 sources.

Its hardware includes a 16-bit free-running timer with input capture (4 channels) and output compare (2 channels), two independent 8-bit timers with PWM-capable outputs, a watchdog timer configurable as interval timer, and a UART-compatible serial interface supporting asynchronous and synchronous modes with programmable baud rate generation.

Key Specifications

Pinout & Package

HD6473294PJ16 is housed in a 80-pin plastic QFP (PQFP) package with 0.65 mm lead pitch, compliant with JEDEC MS-026. Pin functions are defined for single-chip mode only - no multiplexed bus signals.

Key Features

Applications

Equivalent & Alternatives

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

Compared with HD64F3294FV and R5F100LEA, the HD6473294PJ16 offers lowest unit cost in volume production, guaranteed mask-ROM reliability, and exact H8/300 instruction compatibility - critical for maintaining legacy industrial firmware without toolchain migration.

Availability

HD6473294PJ16 is available at Aetrix Electronics and suitable for industrial motor control, HVAC actuator modules, and home appliance main controllers requiring stable component supply across extended product lifecycles.

Supply support for HD6473294PJ16 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

Hitachi Ltd. (now part of Renesas Electronics Corporation) was a Japanese multinational conglomerate specializing in semiconductor design, industrial systems, and infrastructure solutions.

The H8/3294 series was developed as a cost-optimized, single-chip 16-bit microcontroller line targeting high-reliability embedded control in white goods, factory equipment, and building automation - emphasizing ROM integration, timer precision, and I/O flexibility.

FAQ

What is the maximum operating frequency of the HD6473294PJ16?

The HD6473294PJ16 supports a maximum CPU clock frequency of 16 MHz when driven by an external crystal or ceramic resonator connected to XTAL/EXTAL pins. Internal clock division ratios allow lower-frequency operation for power optimization, and the H8/300 core maintains deterministic instruction timing across all supported frequencies. The HD6473294PJ16 does not include an internal RC oscillator - external timing source is mandatory.

Does the HD6473294PJ16 support external memory expansion?

No, the HD6473294PJ16 operates exclusively in single-chip mode with no external bus interface. All program execution occurs from its 32 KB on-chip mask-ROM, and data operations use its 1 KB on-chip RAM. The HD6473294PJ16 pinout omits address/data bus signals, and the hardware manual confirms no external memory wait-state controller or bus arbitration logic is implemented.

How many analog input channels does the HD6473294PJ16 A/D converter support?

The HD6473294PJ16 integrates an 8-channel, 10-bit successive-approximation A/D converter. Channels AD0–AD7 map directly to Port 3 pins P30–P37 and are selected via the ADCR register. Conversion time is 10.2 µs per sample at maximum clock rate, and the module supports both single-shot and scan modes with interrupt-on-completion capability.

Is the HD6473294PJ16 pin-compatible with other H8/329x series devices?

Yes, the HD6473294PJ16 shares identical 80-pin PQFP packaging and pin assignments with HD6473297PJ16, HD6433294FV, and HD6433296FV within the H8/329x family. However, peripheral enablement (e.g., ROM size, RAM size, A/D channel count) varies by model - firmware must be validated for the specific device variant even when hardware layout is reused.

What development tools are officially supported for the HD6473294PJ16?

Hitachi provided the H8/300 Series C Compiler (H8C), assembler (HAS), linker (HLINK), and debugger (HEW) for the HD6473294PJ16. Third-party tools including IAR Embedded Workbench for H8 and GNU-based H8 toolchains also support this device. Evaluation is typically performed using the H8/3294 evaluation board (EVB-H83294) with on-chip debug interface via JTAG-compatible header.