Renesas HD6473378CQ10

Overview

HD6473378CQ10 from Hitachi is a 16-bit single-chip microcontroller in the H8/337 series, featuring an H8/300 CPU core, 32 KB on-chip masked ROM, 1 KB RAM, integrated 16-bit free-running timer, dual 8-bit timers, PWM timers, UART-compatible serial interface, 8-channel 10-bit A/D converter, and dual 8-bit D/A converters. It operates at up to 10 MHz and targets real-time embedded control in industrial motor drives and sensor-based instrumentation.

For engineers reviewing the HD6473378CQ10 datasheet, HD6473378CQ10 pinout, HD6473378CQ10 application, or HD6473378CQ10 equivalent, key selection considerations include ROM size (32 KB), RAM capacity (1 KB), A/D resolution (10-bit, 8-channel), D/A count (2×8-bit), and support for software/hardware standby power-down modes.

Technical Context

The HD6473378CQ10 implements the H8/300 CPU architecture with 24-bit address space, supporting single-chip mode and expanded bus modes via mode-select pins. Its memory map includes fixed vector interrupt table at 0xFFE0–0xFFFF and dedicated register fields for peripheral control at fixed I/O addresses (e.g., FRC at H'FF92, ADCSR at H'FFE8).

Peripheral integration follows a register-mapped I/O model: all timers, serial interface, A/D and D/A modules use dedicated memory-mapped control/status registers with bit-field definitions for mode selection, interrupt enable, and data transfer. Clock generation relies on external crystal (1–10 MHz) with internal divider enabling 1:1 to 1:8 system clock scaling.

Key Specifications

Pinout & Package

HD6473378CQ10 is housed in a 100-pin plastic quad flat package (QFP) with 0.65 mm lead pitch. Pin functions are defined per Hardware Manual Section 1.3, including multiplexed I/O ports (P1–P9), dedicated peripheral signals (e.g., ADTRG, DA0, DA1), and mode-control pins (MD0–MD2).

Key Features

Applications

Equivalent & Alternatives

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

Compared with HD64F3378FV and HD6413378CQ10, the HD6473378CQ10 offers lowest system cost and highest reliability for fixed-function embedded controllers, trading reprogrammability and external memory flexibility for reduced component count and guaranteed ROM integrity.

Availability

HD6473378CQ10 is available at Aetrix Electronics and suitable for industrial motor control, sensor signal conditioning, and programmable power supply designs requiring stable component supply across extended product lifecycles.

Supply support for HD6473378CQ10 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 semiconductors, industrial systems, and IT infrastructure prior to its semiconductor division's merger into Renesas in 2003.

The H8/337 series was designed for cost-effective, real-time embedded control in resource-constrained industrial equipment, emphasizing on-chip integration of analog I/O, timing, and communication to minimize external components.

FAQ

What is the maximum operating frequency of the HD6473378CQ10?

The HD6473378CQ10 supports a maximum system clock frequency of 10 MHz when driven by an external crystal connected to XTAL/EXTAL pins. This frequency determines instruction execution speed, A/D conversion rate, and timer resolution. The internal clock divider allows lower effective CPU speeds for power optimization, but the HD6473378CQ10's rated performance ceiling remains 10 MHz under specified voltage and temperature conditions.

Does the HD6473378CQ10 include a hardware debug interface?

No, the HD6473378CQ10 does not incorporate a dedicated on-chip debug interface such as JTAG or BDM. Debugging relies on in-circuit emulators compatible with the H8/300 architecture or software-based techniques using SCI output and breakpoint polling. The HD6473378CQ10's pinout reserves no dedicated debug signals, and its Hardware Manual makes no provision for real-time trace or halt-mode debugging.

Can the HD6473378CQ10 operate from a 3.3 V supply?

No, the HD6473378CQ10 is specified for 5 V ±10% operation only, as confirmed by Absolute Maximum Ratings and DC Characteristics in Section 16.1–16.2 of the Hardware Manual. Attempting 3.3 V operation will result in undefined behavior, failed A/D conversions, and unreliable timer or serial interface function. The HD6473378CQ10 requires a regulated 5 V supply across VCC and VSS pins.

How many interrupt sources does the HD6473378CQ10 support?

The HD6473378CQ10 supports 48 interrupt sources, including 16 external IRQ pins, 16 internal peripheral interrupts (e.g., timer overflow, A/D completion, SCI receive), and 16 exception vectors (reset, NMI, traps). Each source maps to a unique vector address in the fixed interrupt table at 0xFFE0–0xFFFF, and priority is determined by vector address order - lower addresses indicate higher priority. This structure is documented in Section 4 of the HD6473378CQ10 Hardware Manual.

Is the HD6473378CQ10 pin-compatible with other H8/337 family members?

Yes, the HD6473378CQ10 shares identical pinout and package (100-pin QFP) with HD6433378CQ10 and HD6413378CQ10, as verified in Section 1.3.1 of the Hardware Manual. All three variants use the same MD0–MD2 mode pins, P1–P9 port assignments, and peripheral signal locations (e.g., DA0/DA1, ADTRG, TXD/RXD). This allows PCB reuse across mask ROM, ZTAT, and ROMless versions of the H8/337 series.