Renesas R4F24258NVFPU

Overview

R4F24258NVFPU from Renesas Electronics is a 16-bit single-chip microcontroller in the H8S/2425 Group, designed for embedded control applications requiring deterministic real-time response, on-chip flash memory, and integrated peripheral functions including TPU, SCI, WDT, and interrupt controller. It operates at up to 25 MHz, supports 5 V operation, and integrates 256 KB of on-chip ROM and 16 KB of RAM.

For engineers reviewing the R4F24258NVFPU datasheet, R4F24258NVFPU pinout, R4F24258NVFPU application, or R4F24258NVFPU equivalent, key selection criteria include its H8S CPU core compatibility, 100-pin LQFP package, 5 V supply tolerance, 25 MHz max clock, and support for industrial temperature range (−40°C to +85°C) without external voltage regulators.

Technical Context

The R4F24258NVFPU implements the H8S/2000-compatible CPU core with 16-bit data bus and 24-bit address space, supporting both normal and advanced operating modes. It includes a programmable clock pulse generator (CPG) with internal oscillator and PLL options, enabling flexible system clock configuration across multiple peripheral domains.

Peripheral integration includes a 16-bit Timer Pulse Unit (TPU) with 8 channels, two asynchronous Serial Communication Interfaces (SCI), a watchdog timer (WDT) with window function, and an 8-level priority interrupt controller with 64 vector entries. Memory mapping is configurable via mode control registers to support boot ROM, user ROM, and RAM regions.

Key Specifications

Pinout & Package

Package: 100-pin LQFP (14 mm × 14 mm, 0.5 mm pitch), RoHS-compliant, moisture sensitivity level 3.

Key Features

Applications

Equivalent & Alternatives

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

Compared with R4F24258NVFPU, R4F2425NVFPU offers reduced memory at lower cost for basic control, while R4F2427NVFPU adds CAN and doubles ROM for complex industrial networking - neither is pin-compatible without verifying peripheral register map alignment per application note H8S2427HAN.

Availability

R4F24258NVFPU is available at Aetrix Electronics and suitable for industrial motor control, building automation panels, factory floor PLC I/O modules, and energy metering gateways requiring stable component supply, long-term lifecycle support, and 5 V system compatibility.

Supply support for R4F24258NVFPU 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 R4F24258NVFPU, was designed for cost-sensitive industrial control applications demanding high noise immunity, 5 V robustness, and deterministic real-time performance without external support chips.

FAQ

What is the maximum system clock frequency supported by the R4F24258NVFPU?

The R4F24258NVFPU supports a maximum system clock frequency of 25 MHz. This is achieved using either an external crystal (1–8 MHz) with internal PLL multiplication or a direct external clock source (1–25 MHz). At 25 MHz, the CPU executes instructions with a 40 ns cycle time, enabling tight real-time control loops. The R4F24258NVFPU's CPG module ensures stable clock distribution to all peripherals without external clock buffers.

Does the R4F24258NVFPU include on-chip debug support?

Yes, the R4F24258NVFPU includes on-chip debugging capability via the on-chip debug interface (OCD), compatible with Renesas E8/E8a emulators. This allows full hardware breakpoint setting, real-time register and memory inspection, and non-intrusive program stepping without requiring dedicated debug pins - all accessible through the standard 10-pin JTAG connector defined in the hardware manual. The R4F24258NVFPU's OCD supports both flash programming and runtime analysis.

What is the memory configuration of the R4F24258NVFPU?

The R4F24258NVFPU integrates 256 KB of on-chip flash ROM and 16 KB of RAM. The ROM is organized as user-programmable flash memory with sector erase capability and ≥10,000 write/erase cycles. The RAM is SRAM mapped into the H8S 24-bit address space starting at 0x00E000. Both memory blocks are directly accessible by the CPU without wait states at 25 MHz, and the R4F24258NVFPU supports boot-from-ROM operation with vector table located at fixed address 0x000000.

Is the R4F24258NVFPU pin-compatible with other H8S/2425 family members?

The R4F24258NVFPU uses a 100-pin LQFP package with pin assignments fully aligned with the H8S/2425 Group specification. It shares identical pinout with R4F2425NVFPU and R4F2425AVFPU, differing only in memory size and factory-programmed options. However, it is not pin-compatible with H8S/2427 variants due to additional CAN-related pins (CANRX/CANTX) present on those packages. Always verify peripheral register mapping before substituting within the same footprint.

What industrial temperature range does the R4F24258NVFPU support?

The R4F24258NVFPU is rated for operation across the industrial temperature range of −40°C to +85°C. This rating is validated per Renesas' Standard quality grade qualification, covering thermal cycling, high-temperature operating life, and storage tests. The R4F24258NVFPU maintains full electrical specifications - including 25 MHz operation, I/O drive strength, and flash programming voltage - across this full range, making it suitable for deployment in uncontrolled environments such as factory floors and outdoor control cabinets.