Renesas DF38086RH10V

Overview

DF38086RH10V from Renesas Electronics is a 16-bit single-chip microcomputer in the H8/300H Super Low Power Series, featuring an H8/300H CPU core with H8/300 instruction set compatibility, 512 KB on-chip ROM, 32 KB RAM, and integrated peripherals including TPU, SCI, I²C, and RTC. It operates at up to 20 MHz and supports multiple low-power modes (Active, Subactive, Subsleep, Standby) for battery-powered industrial control and metering applications.

For engineers reviewing the DF38086RH10V datasheet, DF38086RH10V pinout, DF38086RH10V application, or DF38086RH10V equivalent, key selection criteria include its 80-pin TQFP package (12 × 12 mm, 0.5 mm pitch), 32.768-kHz subclock support for RTC, flash memory standby control via FROMCKSTP bit, and interrupt mask level configuration using IPRA–IPRE registers.

Technical Context

The DF38086RH10V implements a Harvard-architecture H8/300H CPU with 24-bit address space and 16-bit data bus, supporting both medium-speed (φM) and high-speed (φH) clock domains. Its system clock generator accepts external crystal (4.19 MHz) or on-chip oscillator, while the subclock generator drives RTC using 32.768-kHz or 38.4-kHz resonators with configurable sampling rate (φOSC/4 or φOSC/16).

Power management is handled by SYSCR1/SYSCR2 and CKSTPR1/CKSTPR2 registers, enabling fine-grained module-level clock gating - e.g., SCI4 and Flash Memory can be placed in standby independently via S4CKSTP and FROMCKSTP bits. Interrupt handling uses a priority-based controller with three mask levels per source (excluding NMI and address break), controlled by IPR registers and global INTM/CCR bits.

Key Specifications

Pinout & Package

DF38086RH10V is housed in a 80-pin Thin Quad Flat Package (TQFP) with 0.5 mm lead pitch and 12 × 12 mm body size (package code PTQP0080KC-A). The pinout supports full multiplexing of peripheral functions across port pins, with dedicated reset (RES), clock inputs (OSC1/OSC2, SUBCLK), and debug interface signals (NMI, P16, P36, P37).

Key Features

Applications

Equivalent & Alternatives

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

Compared with DF38086RH10V, R5F38086KDFP offers more ROM in a larger package but removes fine-grained flash power control, while H8S/2368F delivers higher performance at the cost of full software and hardware requalification - making DF38086RH10V optimal for cost-sensitive, low-power embedded upgrades with existing H8/300H codebases.

Availability

DF38086RH10V is available at Aetrix Electronics and suitable for smart metering, industrial I/O modules, portable medical devices, and building automation sensor nodes requiring stable component supply and long-term lifecycle support.

Supply support for DF38086RH10V 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 automotive, industrial, and IoT markets.

The H8/38086R Group was designed for ultra-low-power embedded control in resource-constrained applications such as utility meters and portable instrumentation, emphasizing retention-capable sleep modes and integrated peripherals to minimize external component count.

FAQ

What is the maximum operating frequency of the DF38086RH10V?

The DF38086RH10V supports a maximum system clock frequency of 20 MHz in high-speed active mode. This frequency is achieved using the external crystal oscillator (4.19 MHz) multiplied internally, and enables instruction execution at sub-50 ns cycle times. Operation above 20 MHz is not supported and may cause undefined behavior or timing violations in on-chip peripherals like TPU or SCI.

Does the DF38086RH10V support in-system programming without external hardware?

Yes, the DF38086RH10V supports in-system programming via its built-in boot mode using SCI3 (pins P41/RXD and P42/TXD). When the device boots in this mode, it accepts serial commands to erase and reprogram the on-chip mask ROM. No external programmer or debug probe is required, simplifying field firmware updates and reducing test fixture complexity for DF38086RH10V-based products.

How does the DF38086RH10V manage power in battery-operated applications?

The DF38086RH10V provides four distinct low-power modes - Active, Subactive, Subsleep, and Standby - each with progressively lower current draw. In Subsleep mode, it retains RTC, asynchronous event counter, and TPU state while consuming less than 2 µA, enabling decade-long battery life in metering applications. Wake-up is supported via external pins, RTC alarm, or serial activity on SCI interfaces.

Can the DF38086RH10V use both external crystals and internal oscillators simultaneously?

No, the DF38086RH10V cannot run external and internal oscillators concurrently. Its clock system selects either the main crystal oscillator (OSC1/OSC2) or the on-chip oscillator (enabled via SYSCR1 settings), but not both. The subclock generator operates independently using a separate 32.768-kHz or 38.4-kHz resonator for RTC, and this circuit remains active even when the main system clock is halted.

What debug capabilities are integrated into the DF38086RH10V?

The DF38086RH10V includes an on-chip debugger that uses NMI, P16, P36, and P37 pins along with reserved memory regions (H'C000–H'CFFF and H'F380–H'F77F). It supports breakpoints, register inspection, and memory read/write without external JTAG hardware. However, these pins and memory areas are unavailable for user application when debug mode is active, requiring careful design partitioning in DF38086RH10V-based systems.