Renesas R4F24259DVFAU

Overview

R4F24259DVFAU from Renesas Electronics is a 16-bit single-chip microcontroller in the H8S/2425 Group, featuring a 32 MHz max CPU clock, 256 KB on-chip flash memory, 16 KB RAM, and integrated peripherals including TPU, SCI, WDT, and CPG. It operates across –40°C to +85°C and supports single-supply 3.3 V operation, targeting industrial motor control and embedded instrumentation systems.

For engineers reviewing the R4F24259DVFAU datasheet, R4F24259DVFAU pinout, R4F24259DVFAU application, or R4F24259DVFAU equivalent, key selection criteria include its 100-pin LQFP package, 32-bit address space, interrupt controller with 128 vectors, watchdog timer with window function, and support for both normal and advanced CPU operating modes.

Technical Context

The R4F24259DVFAU implements the H8S/2000-compatible CPU core with extended addressing (32-bit linear space), supporting both Normal and Advanced operating modes. It integrates a Clock Pulse Generator (CPG) with PLL for internal clock synthesis, a 16-bit Timer Pulse Unit (TPU) with 8 channels, and dual Serial Communication Interfaces (SCI) compliant with UART/RS-232 protocols.

Its interrupt system includes 128 vector entries, priority-controlled IRQ inputs, and software standby release capability. Memory protection is enforced via an on-chip bus controller (BSC) with configurable wait-state generation and access arbitration for external memory expansion up to 16 MB.

Key Specifications

Pinout & Package

This device is housed in a 100-pin LQFP (14 mm × 14 mm, 0.5 mm pitch) package with exposed thermal pad, optimized for industrial PCB layouts requiring moderate I/O count and thermal reliability.

Key Features

Applications

Equivalent & Alternatives

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

Compared with R4F24259DVFAU, the R4F24258DVFAU reduces memory resources without altering timing or I/O behavior, while the R4F24279DVFAU adds CAN and doubles memory - both retain identical clocking, interrupt, and TPU performance for drop-in migration paths where memory or connectivity requirements shift.

Availability

R4F24259DVFAU is available at Aetrix Electronics and suitable for industrial motor drive, factory automation PLC, and embedded test equipment requiring stable component supply and long-term production continuity.

Supply support for R4F24259DVFAU 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 infrastructure markets.

The H8S/2425 Group, including R4F24259DVFAU, was designed for deterministic real-time control in resource-constrained industrial environments - emphasizing interrupt latency predictability, flash endurance, and robustness across extended temperature ranges.

FAQ

What is the maximum operating frequency supported by the R4F24259DVFAU?

The R4F24259DVFAU supports a maximum CPU clock frequency of 32 MHz, achieved via its on-chip Clock Pulse Generator with PLL. This frequency is validated across the full industrial temperature range (–40°C to +85°C) and 3.3 V supply, enabling consistent 16-MIPS throughput for real-time control tasks. The R4F24259DVFAU's timing specifications guarantee setup/hold margins and interrupt response times at this rated speed.

Does the R4F24259DVFAU include a hardware watchdog timer with windowing capability?

Yes, the R4F24259DVFAU integrates a windowed watchdog timer (WDT) that requires service within a defined time window - not just before timeout - to prevent unintended resets. This feature is implemented in hardware and documented in Section 4.5 of the H8S/2425 Group User's Manual. The R4F24259DVFAU's WDT enhances system safety in motor control and PLC applications where silent firmware hangs must be detected and recovered.

How much on-chip flash memory does the R4F24259DVFAU provide, and what is its erase granularity?

The R4F24259DVFAU provides 256 KB of on-chip flash memory, organized into 256 blocks of 1 KB each. This 1 KB erase granularity allows partial firmware updates without erasing the entire memory - essential for field upgrades in deployed R4F24259DVFAU-based systems. The flash supports 10,000 write/erase cycles and data retention exceeding 20 years at 85°C.

Is the R4F24259DVFAU pin-compatible with other members of the H8S/2425 Group?

Yes, the R4F24259DVFAU shares the same 100-pin LQFP package and pin assignments with other H8S/2425 Group variants such as R4F24258DVFAU and R4F24257DVFAU. Pin compatibility is confirmed in Section 1.4.1 (Pin Assignments) of the H8S/2425 Group User's Manual. This allows direct substitution within the same footprint when memory or peripheral requirements change, provided software accounts for differences in flash/RAM size.

What peripheral interfaces are integrated into the R4F24259DVFAU for industrial communication?

The R4F24259DVFAU integrates two independent Serial Communication Interfaces (SCI0 and SCI1), each supporting UART/RS-232 protocols with programmable baud rates and separate clock generators. It also includes a 16-bit Timer Pulse Unit (TPU) with eight I/O channels for PWM, input capture, and quadrature decoding - enabling direct connection to encoders, inverters, and actuator drivers without external logic. No CAN or Ethernet is included in the R4F24259DVFAU.