Renesas R4F24259NVFPU

Overview

R4F24259NVFPU from Renesas Electronics is a 16-bit single-chip microcontroller in the H8S/2425 Group, featuring an H8S/2400 CPU core, 512 KB on-chip Flash memory, 32 KB RAM, and integrated peripherals including TPU (16-bit timer pulse unit), SCI (serial communication interface), and WDT (watchdog timer). It operates at up to 33 MHz and targets industrial control and embedded automation applications requiring deterministic real-time response.

For engineers reviewing the R4F24259NVFPU datasheet, R4F24259NVFPU pinout, R4F24259NVFPU application, or R4F24259NVFPU equivalent, key selection criteria include Flash endurance (10,000 write/erase cycles), operating voltage range (3.0 V to 5.5 V), -40°C to +85°C industrial temperature grade, and support for multiple low-power modes (HALT, STOP, and software standby).

Technical Context

The R4F24259NVFPU implements the H8S/2400 CPU architecture with 24-bit address space, 16-bit data bus, and Harvard-style memory organization. It supports advanced mode operation with extended register sets (EXR, MAC) and includes a clock pulse generator (CPG) enabling flexible clock source selection (main crystal, sub-crystal, or internal RC oscillator) and programmable prescalers for peripheral timing.

Peripheral integration includes dual SCI channels supporting asynchronous communication at up to 2 Mbps, a 16-bit TPU with 8 independent channels for PWM generation and input capture, and a 16-bit watchdog timer with windowed timeout detection. Memory protection is enforced via a 4-region memory management unit (MMU) supporting privilege-level access control.

Key Specifications

Pinout & Package

Package: 100-pin LQFP (14 mm × 14 mm, 0.5 mm pitch), thermally enhanced with exposed pad (EPAD) connected to VSS for improved heat dissipation in continuous 33 MHz operation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with R4F24259NVFPU, the R4F24258NVFPU offers lower memory capacity at reduced cost for simpler control tasks, while the R4F24279NVFPU extends functionality with CAN and enhanced analog capability-neither is pin-compatible nor drop-in; both require PCB layout and firmware adaptation.

Availability

R4F24259NVFPU is available at Aetrix Electronics and suitable for industrial PLC I/O modules, motor drive control units, building automation gateways, and embedded HMI controllers requiring stable component supply across multi-year production cycles.

Supply support for R4F24259NVFPU 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 R4F24259NVFPU, was designed for deterministic real-time control in harsh industrial environments-emphasizing robust I/O, long-life Flash, and comprehensive debug support for safety-critical embedded development.

FAQ

What is the maximum operating frequency of the R4F24259NVFPU?

The R4F24259NVFPU supports a maximum CPU clock frequency of 33 MHz when powered at 4.5–5.5 V. At 3.0–4.4 V, the rated maximum is 25 MHz. This frequency governs instruction throughput, peripheral timing accuracy, and real-time interrupt response-critical for applications like motor control where TPU PWM resolution depends directly on clock stability. The R4F24259NVFPU achieves this via its integrated clock pulse generator (CPG) with programmable prescalers and PLL bypass mode.

Does the R4F24259NVFPU include a hardware memory protection unit?

Yes, the R4F24259NVFPU integrates a 4-region memory protection unit (MPU) that enforces read/write/execute privileges per memory segment. Each region can be configured for user/supervisor access levels, preventing unintended writes to Flash or execution from RAM-essential for certified industrial firmware. Configuration is done via the MPU control registers (MPUCR0–MPUCR3), and violations trigger a privileged instruction exception. This feature is documented in Section 3.3.2 of the H8S/2425 Group Hardware User's Manual.

What low-power modes does the R4F24259NVFPU support, and what is the lowest current draw?

The R4F24259NVFPU supports HALT, STOP, and software standby modes. In STOP mode with RTC enabled and wake-up IRQs active, typical current consumption is 1.2 µA at 3.3 V and 25°C. This mode retains RAM content and selected register states while stopping the CPU, peripherals, and main clock-ideal for battery-backed sensor nodes or periodic polling applications. Wake-up occurs within 10 µs via external IRQ or RTC alarm. Full details appear in Section 3.3 of the Hardware User's Manual.

Is the R4F24259NVFPU pin-compatible with other members of the H8S/2425 Group?

No, the R4F24259NVFPU is not universally pin-compatible across the H8S/2425 Group. While it shares the 100-pin LQFP package with R4F24258NVFPU and R4F24279NVFPU, pin functions differ-for example, R4F24279NVFPU allocates pins for CAN_TX/CAN_RX that are general-purpose I/O on R4F24259NVFPU. Always verify pin assignments using the "Pin Assignments" section (Section 1.4.1) of the official Hardware User's Manual before board reuse.

What debug interface does the R4F24259NVFPU use, and which emulators are supported?

The R4F24259NVFPU uses Renesas' on-chip debug interface compliant with the E1 and E20 emulator families. It supports non-intrusive real-time debugging-including breakpoints, watchpoints, register inspection, and flash programming-without halting peripheral timers or SCI communication. The interface connects via a 14-pin JTAG/SWD header (pinout defined in Section 1.4.3 of the Hardware User's Manual) and requires Renesas CS+ or e2 studio IDE for full feature access.