Renesas D73042F12V

Overview

D73042F12V from Renesas Electronics is an H8/3042 Series 16-bit microcontroller featuring an H8/300H CPU core, 128 KB on-chip ROM, 8 KB RAM, integrated 16-bit ITU timer, A/D and D/A converters, SCI serial interface, and DMAC - designed for real-time industrial control systems requiring deterministic timing and external memory expansion.

For engineers reviewing the D73042F12V datasheet, D73042F12V pinout, D73042F12V application, or D73042F12V equivalent, key selection criteria include its 16-Mbyte linear address space, seven configurable operating modes (Modes 1–7), independent bus width/address space per memory area, and support for dynamic RAM refresh via on-chip controller.

Technical Context

The D73042F12V implements the H8/300H CPU core with sixteen 16-bit general-purpose registers and a 32-bit internal data path, enabling efficient execution of compact instruction set optimized for speed. It supports seven distinct operating modes that define initial data bus width (8/16-bit) and address space size (1–16 Mbytes).

Memory mapping divides the address space into eight independently configurable areas, each supporting selectable data bus width and access cycle length. The integrated refresh controller manages DRAM and pseudo-static RAM, while the DMAC supports full- and short-address modes with block transfer, repeat, and idle operation.

Key Specifications

Pinout & Package

Package: 100-pin plastic LQFP (14 mm × 14 mm, 0.5 mm pitch), RoHS-compliant, surface-mount.

Key Features

Applications

Equivalent & Alternatives

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

Compared with H8/3041F12V and the identically functional H8/3042F12V, the D73042F12V provides double the on-chip ROM and RAM capacity while retaining identical pinout, peripheral register map, and instruction compatibility - enabling seamless firmware scalability without hardware redesign.

Availability

D73042F12V is available at Aetrix Electronics and suitable for industrial PLC I/O modules, motor drive control boards, automated test equipment, and medical diagnostic instruments requiring stable component supply across extended product lifecycles.

Supply support for D73042F12V 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 is a Japanese semiconductor manufacturer specializing in microcontrollers, analog, and power devices for industrial, automotive, and infrastructure markets.

The H8/3042 Series was designed for high-reliability embedded control applications demanding deterministic real-time performance, external memory expansion, and integrated analog I/O - targeting industrial automation and test instrumentation.

FAQ

What is the maximum operating frequency supported by the D73042F12V?

The D73042F12V supports a maximum system clock frequency of 20 MHz when using an external crystal or clock source. Its H8/300H CPU core executes instructions at one cycle per clock for most operations, delivering predictable real-time performance. The device's bus controller and wait-state logic ensure reliable access to external memory and peripherals at this frequency. Timing specifications for all on-chip modules - including ITU, SCI, and DMAC - are validated up to 20 MHz in the official hardware manual ADE-602-067.

Does the D73042F12V include on-chip debug support?

The D73042F12V does not integrate on-chip debug circuitry such as JTAG or FINE interfaces. Debugging requires external in-circuit emulators (ICE) compatible with the H8/300H architecture, such as the Renesas E8/E8a emulator. The device provides dedicated debug pins (e.g., BKPT, RES#) for breakpoint and reset control during emulation. Firmware development relies on external toolchain support - the D73042F12V itself contains no debug ROM or built-in monitor.

Can the D73042F12V directly interface with DDR SDRAM?

No, the D73042F12V cannot interface with DDR SDRAM. Its external bus controller supports only asynchronous SRAM, ROM, and pseudo-static or standard DRAM (e.g., 256K×16, 1M×16) with hardware-controlled refresh. DDR SDRAM requires differential clocking, bidirectional DQS strobes, and command-based protocol timing - none of which are implemented in the D73042F12V's bus interface. Systems requiring DDR must use an external memory controller or bridge IC.

What are the power supply requirements for the D73042F12V?

The D73042F12V requires a single 5.0 V ±10% supply applied to VCC pins, with separate VSS ground connections. It does not support 3.3 V operation or internal voltage regulation. All I/O pins are 5 V-tolerant and CMOS-compatible. Power consumption varies with clock frequency and active peripherals - typical active current is 85 mA at 20 MHz, dropping to 15 µA in stop mode. Decoupling capacitors (0.1 µF ceramic + 10 µF tantalum) are required per power pair per the hardware manual.

Is the D73042F12V pin-compatible with other H8/3042 variants like the D73042F8V?

Yes, the D73042F12V is fully pin-compatible with other 100-pin LQFP variants in the H8/3042 family, including the D73042F8V. Differences between these variants lie solely in configured ROM size (128 KB vs. 64 KB) and factory-programmed memory content - not in pin function, electrical characteristics, or package dimensions. All share identical pinout, register map, and peripheral implementation, allowing drop-in replacement where firmware size permits.