Renesas DF38086RW10V

Overview

DF38086RW10V 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 mask 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 DF38086RW10V datasheet, DF38086RW10V pinout, DF38086RW10V application, or DF38086RW10V 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 via IPRA–IPRE registers.

Technical Context

The DF38086RW10V implements a Harvard-architecture H8/300H CPU with 16-bit data bus and 24-bit address space, supporting both medium-speed (φM) and high-speed (φH) clock domains. Its system clock generator accepts external crystal (4.19 MHz), on-chip oscillator, or external clock input, with configurable oscillation stabilization wait time and programmable prescaler S for peripheral timing.

Power management includes four operating modes controlled by SYSCR1/SYSCR2 and CKSTPR1 registers: Active (full-speed operation), Subactive (reduced φW/2 or φW/4), Subsleep (φW/8 only), and Standby (RTC + async counter retained). The interrupt controller supports three mask levels per source (excluding NMI/address break) via 2-bit fields in IPRA–IPRE registers.

Key Specifications

Pinout & Package

DF38086RW10V is housed in a 80-pin Thin Quad Flat Package (TQFP) with 0.5 mm pitch and 12 × 12 mm footprint (package code PTQP0080KC-A). Pin functions are defined across five I/O ports (P1–P5), with dedicated signals for clock inputs (OSC1/OSC2, SUBCLK), reset (RES), debug (NMI, P16/P36/P37), and peripheral interfaces (SCI, I²C, TPU, ADC).

Key Features

Applications

Equivalent & Alternatives

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

Compared with DF38086RW10V, R5F38086W10V offers identical hardware compatibility for firmware variants, while H8/38085R provides a lower-cost entry point with halved memory resources - both maintain the same TQFP-80 footprint, interrupt architecture, and low-power mode behavior for seamless migration.

Availability

DF38086RW10V is available at Aetrix Electronics and suitable for smart metering, industrial PLC I/O, portable medical monitoring, HVAC control, and building automation requiring stable component supply across multi-year production cycles.

Supply support for DF38086RW10V 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 industrial, automotive, and infrastructure markets.

The H8/38086R Group belongs to Renesas' legacy 16-bit H8 Family, designed specifically for cost-sensitive, ultra-low-power embedded control in utility metering, factory automation, and portable instrumentation - emphasizing long-term reliability and toolchain stability.

FAQ

What is the maximum operating frequency of the DF38086RW10V microcontroller?

The DF38086RW10V supports a maximum system clock frequency of 20 MHz in Active mode. This is achieved using the main oscillator (e.g., 4.19 MHz crystal with PLL multiplication) or external clock input. The device also supports lower-frequency operation in Subactive, Subsleep, and Standby modes using the 32.768 kHz subclock for RTC and ultra-low-power timing - all modes are fully specified in the H8/38086R Group Hardware Manual Rev. 3.00.

Does the DF38086RW10V include on-chip debug capability?

Yes, the DF38086RW10V integrates an on-chip debugger compatible with Renesas E7/E8 emulators. It uses memory regions H'C000–H'CFFF and H'F380–H'F77F, reserves the NMI pin, and dedicates P16, P36, and P37 for debug communication - these pins are unavailable as general-purpose I/O during debugging. Full debug functionality is documented in Section 1.1 and Appendix A of the H8/38086R Group Hardware Manual.

What low-power modes does the DF38086RW10V support, and which peripherals remain active in Standby mode?

The DF38086RW10V supports four low-power modes: Active, Subactive, Subsleep, and Standby. In Standby mode, the RTC, asynchronous event counter, and TPU register contents are retained while CPU and most peripherals halt - enabling wake-up on RTC alarm or external interrupt with sub-10 µs latency. This behavior is confirmed in Table 6.3 and Section 6.2 of the H8/38086R Group Hardware Manual Rev. 3.00.

Is the DF38086RW10V pin-compatible with other members of the H8/38086R Group?

Yes, the DF38086RW10V shares identical pinout and package (TQFP-80, PTQP0080KC-A) with all members of the H8/38086R Group, including H8/38085R, H8/38084R, and H8/38083R. Differences are limited to on-chip memory size and peripheral enablement - allowing hardware reuse across variants. Pin function mapping is consistent per Table 1.4 in the H8/38086R Group Hardware Manual.

What is the purpose of the FROMCKSTP bit in the DF38086RW10V's CKSTPR1 register?

Setting the FROMCKSTP bit (bit 1) in CKSTPR1 disables the flash memory module clock, placing it into standby mode to reduce power consumption during periods of no code execution or data fetch. When cleared to 0, flash memory enters low-power standby; when set to 1, normal operation resumes. This control is explicitly defined in Section 6.1.3 of the H8/38086R Group Hardware Manual Rev. 3.00.