Renesas R4F24258DFPU

Overview

R4F24258DFPU from Renesas Electronics is a 16-bit single-chip microcontroller in the H8S/2425 Group, featuring 512 KB on-chip Flash memory, 32 KB RAM, and a maximum operating frequency of 32 MHz. It integrates a 16-bit H8S CPU core, TPU (16-bit timer pulse unit), SCI (serial communication interface), WDT (watchdog timer), and CPG (clock pulse generator), targeting industrial control and embedded automation applications.

For engineers reviewing the R4F24258DFPU datasheet, R4F24258DFPU pinout, R4F24258DFPU application, or R4F24258DFPU equivalent, key selection criteria include Flash/RAM capacity, peripheral set (TPU/SCI/WDT), operating voltage range (2.7–5.5 V), and QFP-100 package compatibility for space-constrained industrial PCBs.

Technical Context

The R4F24258DFPU implements the H8S/2400 Series CPU architecture with 16-bit data bus width, 24-bit address space, and support for both normal and advanced CPU operating modes. It includes a programmable clock pulse generator (CPG) enabling flexible system clock configuration via internal PLL and external crystal inputs.

Peripheral integration includes eight-channel 16-bit TPU for PWM generation and input capture, two independent SCI modules supporting asynchronous serial communication at up to 2 Mbps, and a 16-bit watchdog timer with windowed timeout capability - all accessible via dedicated SFRs and interrupt vectors mapped in the exception vector table.

Key Specifications

Pinout & Package

Package: 100-pin LQFP (14 mm × 14 mm, 0.5 mm pitch), RoHS-compliant, surface-mount.

Key Features

Applications

Equivalent & Alternatives

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

Compared with R4F24258DFPU, R4F24254DFPU reduces memory capacity but maintains identical timing, I/O, and peripheral behavior - ideal for cost-sensitive volume production. R4F24278DFPU extends Flash/RAM and adds SCI functionality without layout changes, enabling scalable design evolution within the same hardware platform.

Availability

R4F24258DFPU is available at Aetrix Electronics and suitable for industrial PLC I/O modules, motor drive control units, and building automation gateways requiring stable component supply across multi-year production cycles.

Supply support for R4F24258DFPU 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 R4F24258DFPU, was designed for deterministic real-time control in resource-constrained industrial equipment - emphasizing peripheral integration, Flash endurance, and wide-temperature reliability over raw computational throughput.

FAQ

What is the maximum system clock frequency supported by the R4F24258DFPU?

The R4F24258DFPU supports a maximum system clock frequency of 32 MHz, achieved using its internal clock pulse generator (CPG) with PLL multiplication of an external crystal (1–10 MHz) or resonator input. This frequency is specified across the full operating temperature range (−40 °C to +85 °C) and supply voltage (2.7–5.5 V), enabling deterministic real-time execution in industrial control loops.

Does the R4F24258DFPU include on-chip debug support?

Yes, the R4F24258DFPU includes on-chip debugging capability via the on-chip debug interface (OCDS), compatible with Renesas E1/E20 emulators. This allows full breakpoint control, register inspection, and memory read/write during active execution - critical for validating timing-critical functions like TPU waveform generation and SCI baud rate stability in the R4F24258DFPU.

Can the R4F24258DFPU operate from a 3.3 V supply?

Yes, the R4F24258DFPU operates across a supply voltage range of 2.7 V to 5.5 V, fully supporting 3.3 V nominal systems. At 3.3 V, it maintains full 32 MHz operation and all peripheral functions including TPU, SCI, and WDT - verified per Renesas Electrical Characteristics specifications in the H8S/2425 Group Hardware User's Manual (Rev. 3.00).

How many serial communication interfaces does the R4F24258DFPU integrate?

The R4F24258DFPU integrates two independent Serial Communication Interface (SCI) modules, each supporting full-duplex asynchronous communication with programmable baud rates up to 2 Mbps. Both SCIs are accessible via dedicated pins and share no functional dependency - enabling simultaneous use for host communication and fieldbus protocol handling in the R4F24258DFPU.

Is the R4F24258DFPU pin-compatible with other members of the H8S/2425 Group?

Yes, the R4F24258DFPU is pin-compatible with other 100-pin LQFP variants in the H8S/2425 Group, including R4F24254DFPU and R4F24256DFPU. Pin assignments for power, reset, clocks, and all I/O ports match exactly - allowing hardware reuse across memory-configured variants while maintaining identical PCB layout and signal integrity for the R4F24258DFPU.