Renesas DF38086RLP4V

Overview

DF38086RLP4V 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, ADC, 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 DF38086RLP4V datasheet, DF38086RLP4V pinout, DF38086RLP4V application, or DF38086RLP4V 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 DF38086RLP4V 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 using 32.768-kHz or 38.4-kHz resonators with configurable sampling rate (φOSC/4 or φOSC/16) via NESEL bit.

Power management is handled through SYSCR1/2 and CKSTPR1/2 registers, enabling fine-grained module-level standby (e.g., SCI4, Flash memory) and multi-tiered low-power states. Interrupt handling uses a priority-based controller with three mask levels per source (excluding NMI), controlled by IPR registers and global INTM/CCR bits.

Key Specifications

Pinout & Package

DF38086RLP4V is housed in a 80-pin Thin Quad Flat Package (TQFP) with 0.5 mm lead pitch and 12 mm × 12 mm body size (package code PTQP0080KC-A). The pinout supports multiplexed functions across I/O ports, timers, serial interfaces, and power/ground distribution.

Key Features

Applications

Equivalent & Alternatives

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

Compared with DF38086RLP4V, H8/38085R offers memory scaling for mid-complexity applications while maintaining full peripheral and pin compatibility, whereas H8/38084R sacrifices debug capability and memory to achieve lowest unit cost - making DF38086RLP4V optimal for development-intensive, feature-rich embedded systems requiring long-term maintainability.

Availability

DF38086RLP4V is available at Aetrix Electronics and suitable for smart metering, industrial sensor networks, building automation controllers, and portable medical devices requiring stable component supply across multi-year production cycles.

Supply support for DF38086RLP4V 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, and power solutions for industrial, automotive, and IoT applications.

The H8/38086R Group belongs to Renesas' legacy H8 Family of 16-bit MCUs, designed specifically for ultra-low-power, cost-sensitive embedded control in utility, industrial, and consumer equipment where reliability and long-term supply stability are critical.

FAQ

What is the maximum operating frequency of the DF38086RLP4V?

The DF38086RLP4V supports a maximum system clock frequency of 20 MHz in high-speed (φH) mode. This is achieved using the main oscillator circuit with a 4.19 MHz crystal and internal PLL multiplication, enabling fast instruction execution and real-time peripheral response. The DF38086RLP4V maintains full functionality-including TPU PWM generation and SCI communication-at this rated speed under specified voltage and temperature conditions.

Does the DF38086RLP4V include on-chip debug capability?

Yes, the DF38086RLP4V integrates an on-chip debugger that eliminates the need for external JTAG emulators during development. However, this feature reserves the NMI pin and I/O pins P16, P36, and P37 exclusively for debug use - these pins are unavailable for general-purpose I/O when the on-chip debugger is active. The DF38086RLP4V documentation specifies strict usage constraints for areas H'C000–H'CFFF and H'F380–H'F77F during debug sessions.

How does the DF38086RLP4V manage power in low-power applications?

The DF38086RLP4V implements four distinct low-power modes-Active, Subactive, Subsleep, and Standby-with current consumption scaling from ~1 mA down to <10 µA. Key enablers include module-specific clock gating (e.g., FROMCKSTP for flash, S4CKSTP for SCI4), subclock-driven RTC retention, and configurable interrupt mask levels that allow selective wake-up sources. The DF38086RLP4V's SYSCR1/2 and CKSTPR1/2 registers provide granular control over clock domains and peripheral readiness states.

What crystal frequencies are supported for the subclock generator in the DF38086RLP4V?

The DF38086RLP4V subclock generator supports two standard frequencies: 32.768 kHz and 38.4 kHz, intended for RTC and low-frequency timing functions. These connect to XT1/XT2 pins with recommended 7 pF ±20% load capacitors. The DF38086RLP4V datasheet specifies maximum equivalent series resistance (ESR) limits of 35 kΩ (32.768 kHz) and 30 kΩ (38.4 kHz) to ensure reliable oscillation under low-drive conditions required for ultra-low-power operation.

Is the DF38086RLP4V pin-compatible with other members of the H8/38086R Group?

Yes, the DF38086RLP4V shares identical pinout and package (TQFP-80, PTQP0080KC-A) with other variants in the H8/38086R Group, including H8/38085R and H8/38084R. This allows direct PCB reuse across different memory configurations and feature sets. All share the same pin functions, electrical characteristics, and mechanical footprint - simplifying design migration and inventory consolidation for the DF38086RLP4V and its siblings.