Renesas DF38086RW10WV

Overview

DF38086RW10WV 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, supports multiple low-power modes (Active, Subactive, Subsleep, Standby), and targets embedded control in industrial and office equipment.

For engineers reviewing the DF38086RW10WV datasheet, DF38086RW10WV pinout, DF38086RW10WV application, or DF38086RW10WV equivalent, key selection criteria include its 80-pin TQFP package, 3.3 V supply operation, subclock-driven RTC with 32.768 kHz crystal support, flash memory standby control via FROMCKSTP bit, and interrupt mask level configuration using IPRA–IPRE registers.

Technical Context

The DF38086RW10WV implements a Harvard-architecture H8/300H CPU with 24-bit address space, supporting both medium-speed (φM) and high-speed (φH) clock domains. Its system clock generator accepts external crystals (4.19 MHz) or on-chip oscillators, while the subclock generator drives RTC and asynchronous event counters using a 32.768 kHz or 38.4 kHz resonator.

Power management includes four operating modes controlled by SYSCR1/SYSCR2 and CKSTPR1 registers: Active (full-speed execution), Subactive (reduced φW/2 or φW/4), Subsleep (φW/8 only), and Standby (RTC + WDT retained). Interrupt handling uses a 3-level mask system (levels 0–2) configured per-module via IPR registers, with NMI and address break exceptions having fixed priority.

Key Specifications

Pinout & Package

DF38086RW10WV is housed in a 80-pin Thin Quad Flat Package (TQFP) with 0.5 mm pitch, designated PTQP0080KC-A per Renesas documentation. The package supports standard surface-mount reflow assembly and provides full access to all on-chip peripherals including TPU channels, SCI interfaces, and I²C bus pins.

Key Features

Applications

Equivalent & Alternatives

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

Compared with DF38086RW10WV, R5F38086WDFP offers identical functionality under Renesas' post-2010 naming scheme, while H8/38085R provides a memory-downgraded variant with full pin and software compatibility-enabling scalable design reuse across product tiers without layout changes.

Availability

DF38086RW10WV is available at Aetrix Electronics and suitable for industrial control panels, office equipment controllers, test & measurement instruments, and home appliance MCUs requiring stable component supply, long-term lifecycle support, and verified low-power performance.

Supply support for DF38086RW10WV 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 Japanese semiconductor manufacturer specializing in microcontrollers, analog, and power devices for industrial, automotive, and consumer markets.

The H8/38086R Group belongs to Renesas' legacy 16-bit H8 Family, designed specifically for ultra-low-power embedded control in resource-constrained applications where deterministic real-time response and extended battery life are critical.

FAQ

What is the maximum operating frequency of the DF38086RW10WV microcontroller?

The DF38086RW10WV operates at a maximum system clock frequency of 20 MHz in Active (high-speed) mode. This is achieved using the main oscillator (φOSC) derived from a 4.19 MHz crystal multiplied internally. The device also supports lower-frequency operation in Subactive and Subsleep modes using the subclock (φW) divided by 2, 4, or 8-enabling precise timing control while minimizing power consumption. DF38086RW10WV's timing specifications are fully characterized across its 3.3 V ±0.3 V supply range.

Does DF38086RW10WV support external memory expansion?

No, DF38086RW10WV does not support external memory expansion. It integrates 512 KB of on-chip mask ROM and 32 KB of RAM, with no external bus interface (no address/data bus pins or WAIT signal). All program execution and data storage occur within the chip's internal memory space, simplifying PCB layout and improving EMI performance. DF38086RW10WV is optimized for self-contained embedded applications where firmware size fits within the on-chip ROM capacity.

How is the real-time clock (RTC) powered during low-power modes on DF38086RW10WV?

The RTC in DF38086RW10WV remains operational in all low-power modes-including Subactive, Subsleep, and Standby-using the dedicated subclock domain (φW) driven by a 32.768 kHz or 38.4 kHz crystal connected to XT1/XT2. The subclock generator maintains oscillator output even when the main CPU and most peripherals are halted. DF38086RW10WV's RTC retains time, date, and alarm registers with < 1 µA typical current draw in Standby mode, enabling years of battery-backed operation.

Can DF38086RW10WV be programmed in-circuit after soldering?

Yes, DF38086RW10WV supports on-board programming via its built-in SCI3 interface (P41/RXD and P42/TXD pins) when operated in boot mode. This allows firmware updates without removing the IC from the PCB. Programming requires a host controller or PC sending serial commands to the DF38086RW10WV's bootloader, which verifies and writes data to the on-chip ROM. DF38086RW10WV's documentation confirms this capability in the "F-ZTAT Microcomputer On-Board Programming" application note (REJ05B0523).

What are the NC (No Connect) pins on DF38086RW10WV, and how should they be handled?

DF38086RW10WV has designated NC pins-including pins A3, B1, C1, and B2 in the TQFP-80 package-which are not bonded to internal circuitry and serve only for mechanical stability or noise reduction. Renesas explicitly instructs users not to connect anything to NC pins, as doing so may compromise LSI operation or reliability. These pins must remain floating and unconnected on the PCB; tying them to VCC, VSS, or signals is prohibited per the Hardware Manual Rev. 3.00 guidelines.