Renesas R4F24259DVFPU

Overview

R4F24259DVFPU 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 (16-bit timer pulse unit), SCI (serial communication interface), WDT (watchdog timer), and CPG (clock pulse generator). It targets industrial control panels requiring deterministic real-time response and low-power operation.

For engineers reviewing the R4F24259DVFPU datasheet, R4F24259DVFPU pinout, R4F24259DVFPU application, or R4F24259DVFPU equivalent, key selection criteria include Flash endurance (10,000 write/erase cycles), operating voltage range (2.7–5.5 V), -40°C to +85°C industrial temperature grade, and support for H8S/2400-series instruction set compatibility.

Technical Context

The R4F24259DVFPU implements the H8S/2000-compatible CPU core with advanced mode support, enabling 32-bit addressing and extended register access. It integrates a programmable CPG with PLL-based clock synthesis, allowing flexible system clock derivation from external crystals (1–20 MHz) or internal oscillators.

Peripheral subsystems include dual-channel SCI supporting asynchronous full-duplex communication at up to 2 Mbps, a 16-bit TPU with input capture/output compare and PWM generation, and an 8-channel 10-bit ADC with conversion time of 1.2 μs per channel - all accessible via dedicated SFRs and interrupt vectors mapped in the fixed exception vector table.

Key Specifications

Pinout & Package

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

Key Features

Applications

Equivalent & Alternatives

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

Compared with R4F24259DVFPU, the R4F24257DVFPU offers identical real-time performance and peripheral timing but less nonvolatile storage, while the R4F24279DVFPU extends functionality with CAN and doubles memory - making R4F24259DVFPU optimal for Flash-constrained yet feature-complete industrial control where CAN is unnecessary.

Availability

R4F24259DVFPU is available at Aetrix Electronics and suitable for industrial PLC I/O modules, motor control drives, and building automation controllers requiring stable component supply across multi-year production cycles.

Supply support for R4F24259DVFPU 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/2400 Series - including the R4F24259DVFPU - was designed for deterministic real-time control in resource-constrained industrial equipment, emphasizing low-latency interrupt response, on-chip memory efficiency, and long-term supply stability.

FAQ

What is the maximum operating frequency of the R4F24259DVFPU?

The R4F24259DVFPU supports a maximum CPU clock frequency of 32 MHz. This is achieved using the on-chip CPG with PLL multiplication from an external crystal (e.g., 8 MHz input × 4 = 32 MHz). The device maintains full functionality - including ADC conversions, TPU timing, and SCI baud rate generation - at this frequency, with timing margins verified across the full -40°C to +85°C industrial temperature range. The R4F24259DVFPU datasheet specifies setup/hold times and internal propagation delays consistent with this rating.

Does the R4F24259DVFPU include a hardware watchdog timer?

Yes, the R4F24259DVFPU integrates a dedicated 16-bit watchdog timer (WDT) with windowed timeout detection. It operates independently of the main CPU clock and can be configured to generate either a reset or interrupt upon timeout. The WDT supports programmable timeout periods ranging from 2^8 to 2^16 clock cycles of its internal clock source, and its enable/disable control is protected by a write-key sequence to prevent accidental deactivation. This feature is fully documented in the R4F24259DVFPU User's Manual: Hardware, Section 4.5.

What package type and pin count does the R4F24259DVFPU use?

The R4F24259DVFPU is housed in a 100-pin LQFP package measuring 14 mm × 14 mm with 0.5 mm lead pitch. This package is RoHS-compliant and rated MSL-3 per J-STD-020. Pin assignments - including dedicated VCC/VSS pairs, RESET, CLK, SCI, TPU, and ADC channels - are defined in Section 1.4 of the R4F24259DVFPU User's Manual: Hardware. The pinout is shared across the H8S/2425 Group, enabling layout reuse for variants like R4F24257DVFPU.

Can the R4F24259DVFPU execute code from RAM?

No, the R4F24259DVFPU does not support XIP (execute-in-place) from RAM. Its Harvard-style memory architecture separates instruction fetch (from Flash or ROM) and data access (from RAM). While the 16 KB on-chip RAM is fully accessible for variables, stack, and heap, program code must reside in the 256 KB on-chip Flash or external memory mapped via the bus controller (BSC). The R4F24259DVFPU's CPU fetches instructions exclusively from the program address space, which maps Flash starting at 0x000000.

Is the R4F24259DVFPU qualified for automotive applications?

No, the R4F24259DVFPU is classified as a "Standard" quality grade device per Renesas documentation and is intended for industrial, office, and consumer applications - not automotive or safety-critical transportation systems. It lacks AEC-Q100 qualification, failsafe mechanisms (e.g., lockstep cores), and extended temperature support beyond +85°C. For automotive use, Renesas recommends the RH850 family. The R4F24259DVFPU User's Manual explicitly restricts its use in applications posing direct threat to human life or serious property damage, including automotive control units.