Renesas DF38086RH4V

Overview

DF38086RH4V 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, RTC, and WDT - deployed in industrial control panels, sensor interface modules, and low-power metering systems.

For engineers reviewing the DF38086RH4V datasheet, DF38086RH4V pinout, DF38086RH4V application, or DF38086RH4V equivalent, key selection criteria include its 80-pin TQFP-80 package (12 × 12 mm, 0.5 mm pitch), subactive/subsleep mode power management, 4.19 MHz main clock support, and mask ROM configuration for fixed firmware deployment.

Technical Context

The DF38086RH4V implements a static CMOS H8/300H CPU core with 16-bit data bus and 24-bit address space, supporting three operating modes: active (medium/high-speed), subactive, and subsleep - each governed by dedicated clock halt registers (CKSTPR1/CKSTPR2) and system control registers (SYSCR1/SYSCR2). It integrates a 16-bit timer pulse unit (TPU) with input capture, output compare, and PWM functions across multiple channels.

Its clock system includes dual oscillators: a main system oscillator (4.19 MHz crystal supported via OSC1/OSC2 pins) and a subclock generator for 32.768 kHz or 38.4 kHz resonators, enabling real-time clock (RTC) operation and ultra-low-power wake-up capability. The flash memory module supports in-system programming via SCI3 in boot mode.

Key Specifications

Pinout & Package

DF38086RH4V is housed in a 80-pin TQFP package (PTQP0080KC-A, 12 × 12 mm, 0.5 mm pitch) with exposed thermal pad. Pin functions are defined per the H8/38086R Group Hardware Manual Rev.3.00 (2006), with NC pins strictly unconnected per Renesas handling guidelines.

Key Features

Applications

Equivalent & Alternatives

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

Compared with R5F38086KFP and H8S/2357F, DF38086RH4V uniquely balances mask-ROM security, industrial temperature tolerance, and verified sub-10 µA subsleep operation - making it the only choice for cost-constrained, long-life, firmware-immutable embedded controllers.

Availability

DF38086RH4V is available at Aetrix Electronics and suitable for industrial control panels, smart metering systems, and portable safety instruments requiring stable component supply across multi-year production cycles.

Supply support for DF38086RH4V 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 applications.

The H8/38086R Group belongs to Renesas' legacy 16-bit H8 Family, designed specifically for ultra-low-power, cost-sensitive industrial and metering applications where firmware immutability and long-term supply stability are critical.

FAQ

What is the maximum operating frequency of the DF38086RH4V?

The DF38086RH4V operates at a maximum system clock frequency of 20 MHz in high-speed active mode, derived from its 4.19 MHz crystal oscillator multiplied by internal PLL circuitry. Its H8/300H CPU core executes instructions at 1 cycle per instruction for most operations, delivering predictable real-time performance in industrial control loops. DF38086RH4V timing specifications are validated across the full −40°C to +85°C industrial temperature range.

Does DF38086RH4V support in-circuit debugging?

Yes, DF38086RH4V integrates an on-chip debugger compatible with Renesas E8 emulator tools. Debugging uses dedicated pins NMI, P16, P36, and P37, along with memory regions H'C000–H'CFFF and H'F380–H'F77F. When enabled, these resources are unavailable for user application code - DF38086RH4V requires careful pin allocation planning during schematic design to avoid conflicts.

What type of memory does DF38086RH4V use for program storage?

DF38086RH4V uses 512 KB of mask-programmed ROM for program storage, configured at wafer fabrication and permanently unalterable post-manufacture. This provides immunity to firmware corruption, eliminates external memory components, and ensures consistent behavior across all units - a key requirement for certified industrial and utility metering applications where DF38086RH4V is commonly deployed.

Can DF38086RH4V operate from a 32.768 kHz watch crystal alone?

No, DF38086RH4V cannot execute code from the 32.768 kHz subclock alone; it requires the main 4.19 MHz oscillator (or internal oscillator) for CPU operation. However, the 32.768 kHz crystal drives the RTC and asynchronous event counter independently - allowing DF38086RH4V to maintain timekeeping and wake from subsleep mode using only the subclock, while keeping the main CPU halted to minimize power consumption.

Is DF38086RH4V RoHS compliant and lead-free?

Yes, DF38086RH4V complies with EU RoHS Directive 2011/65/EU and is manufactured as a lead-free device. Renesas confirms environmental compliance through material declarations and process controls; full substance documentation is available via Renesas' official product page and authorized distributor portals for DF38086RH4V.