Renesas R4F24255NVFPU

Overview

R4F24255NVFPU from Renesas Electronics is a 16-bit H8S/2425 Group microcontroller featuring 512 KB on-chip Flash memory, 32 KB RAM, and integrated peripherals including TPU, SCI, WDT, and CPG. It operates at up to 32 MHz, supports single-supply 3.3 V operation, and targets industrial control and embedded automation applications requiring deterministic real-time response.

For engineers reviewing the R4F24255NVFPU datasheet, R4F24255NVFPU pinout, R4F24255NVFPU application, or R4F24255NVFPU equivalent, key selection criteria include Flash endurance (10,000 write/erase cycles), operating temperature range (−40°C to +85°C), and support for H8S/2400-series instruction set compatibility with legacy code migration paths.

Technical Context

The R4F24255NVFPU implements the H8S/2400 CPU core with 16-bit data bus and 24-bit address 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 PWM and input capture, and dual Serial Communication Interfaces (SCI) compliant with UART protocols.

Memory subsystem includes 512 KB of on-chip Flash with sector erase capability and 32 KB of SRAM with wait-state programmable access timing. Reset management comprises power-on reset, watchdog timer reset, and external pin reset, all feeding into a centralized Reset Control/Status Register (RSTCSR) with source identification flags.

Key Specifications

Pinout & Package

Package: 100-pin LQFP (14 mm × 14 mm, 0.5 mm pitch) with exposed thermal pad (EP). Pinout conforms to H8S/2425 Group standard assignment per Renesas Hardware User's Manual Rev.3.00.

Key Features

Applications

Equivalent & Alternatives

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

Compared with R4F24255NVFPU, the R4F24254NVFPU offers identical peripheral set and timing behavior at lower memory density, while R4F24275NVFPU introduces CAN functionality and larger memory-neither is pin-compatible, but both share the same development toolchain and instruction set architecture.

Availability

R4F24255NVFPU is available at Aetrix Electronics and suitable for industrial PLC I/O modules, motor drive control boards, and building automation controllers requiring stable component supply across multi-year production cycles.

Supply support for R4F24255NVFPU 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 R4F24255NVFPU, was designed for deterministic real-time control in resource-constrained embedded systems where code efficiency, low-latency interrupt response, and long-term supply stability are critical.

FAQ

What is the maximum operating frequency of the R4F24255NVFPU?

The R4F24255NVFPU supports a maximum CPU clock frequency of 32 MHz when using the internal PLL with an external crystal input. This frequency is achievable across the full industrial temperature range (−40°C to +85°C) under 3.3 V ±0.3 V supply conditions, as verified in Renesas' Electrical Characteristics section of the Hardware User's Manual Rev.3.00. The R4F24255NVFPU's CPG allows configuration of prescaler and multiplier values to derive this clock from 1–20 MHz crystal sources.

Does the R4F24255NVFPU include a hardware watchdog timer?

Yes, the R4F24255NVFPU integrates a dedicated Watchdog Timer (WDT) module with independent clock source and timeout period programmability. It supports both windowed and non-windowed operation modes, and its reset output feeds directly into the system reset controller. The WDT is documented in Section 4.5 of the R4F24255NVFPU Hardware User's Manual and can be disabled only during initial boot sequence before user code execution begins.

Is the R4F24255NVFPU pin-compatible with other H8S/2425 Group members?

Yes, the R4F24255NVFPU shares identical pin assignment and package (100-pin LQFP) with all members of the H8S/2425 Group, including R4F24254NVFPU and R4F24256NVFPU. Pin compatibility is explicitly confirmed in Section 1.4.1 "Pin Assignments" of the H8S/2427, H8S/2427R, H8S/2425 Group User's Manual Rev.3.00, enabling direct PCB reuse across memory-density variants within the same group.

What development tools support the R4F24255NVFPU?

Renesas provides full toolchain support for the R4F24255NVFPU via the High-performance Embedded Workshop (HEW) IDE and the associated H8S/2400 C/C++ compiler. Debugging is enabled through the standard E8/E8a emulator interface, and flash programming is supported via on-chip bootloader accessible over SCI. Renesas Application Notes AN200701 and AN200805 detail peripheral driver examples specifically validated for R4F24255NVFPU hardware.

What is the Flash endurance specification for the R4F24255NVFPU?

The R4F24255NVFPU specifies 10,000 write/erase cycles for its on-chip Flash memory, as stated in the "Electrical Characteristics" chapter of the Hardware User's Manual Rev.3.00. Each sector (128 bytes) may be erased independently, and data retention is guaranteed for 20 years at +85°C. This endurance rating applies under standard operating conditions (3.3 V, −40°C to +85°C) and assumes proper erase/write sequencing per Renesas Flash programming guidelines.