Renesas R4F24278DVFQU

Overview

R4F24278DVFQU from Renesas Electronics is a 16-bit single-chip microcontroller in the H8S/2400 Series, designed for embedded control in industrial and consumer systems. It integrates 512 KB on-chip Flash memory, 32 KB RAM, a 32 MHz max CPU clock, 8-channel 10-bit ADC, and dual SCI interfaces. It operates across –40°C to +85°C and supports low-power stop modes - used in motor control subsystems requiring deterministic real-time response.

For engineers reviewing the R4F24278DVFQU datasheet, R4F24278DVFQU pinout, R4F24278DVFQU application, or R4F24278DVFQU equivalent, key selection criteria include Flash endurance (10,000 write/erase cycles), on-chip debug support via JTAG, and compatibility with Renesas' HEW and e2 studio toolchains - critical for firmware validation and production programming.

Technical Context

The R4F24278DVFQU implements the H8S/2400 CPU core with 32-bit internal data paths and 24-bit addressing, supporting both normal and advanced operating modes. It features a programmable clock pulse generator (CPG) with PLL, enabling flexible system clock derivation from external crystals (1–20 MHz) or resonators.

Peripheral integration includes a 16-bit timer pulse unit (TPU) with PWM output capability, watchdog timer (WDT) with windowed operation, and bus controller (BSC) supporting external memory expansion up to 16 MB. All peripherals are memory-mapped and accessible via dedicated SFRs with interrupt vectoring.

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 microcontroller applications.

Compared with R4F24278DVFQU, R4F24277DVFQU offers lower memory capacity at reduced cost for simpler control tasks, while R4F24279DVFQU adds CAN FD and doubled memory - making it optimal for next-generation automotive and industrial networking applications where scalability matters.

Availability

R4F24278DVFQU is available at Aetrix Electronics and suitable for industrial motor drives, building automation controllers, and factory floor I/O modules requiring stable component supply and long-term lifecycle assurance.

Supply support for R4F24278DVFQU 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 global semiconductor leader headquartered in Japan, specializing in microcontrollers, analog, power, and SoC solutions for industrial, automotive, and enterprise markets.

The H8S/2400 Series - including the R4F24278DVFQU - was engineered for deterministic real-time control in cost-sensitive industrial equipment, balancing performance, peripheral integration, and toolchain maturity.

FAQ

What is the maximum operating frequency supported by the R4F24278DVFQU?

The R4F24278DVFQU supports a maximum CPU clock frequency of 32 MHz, achieved using its on-chip PLL with external crystal input (1–20 MHz). This yields approximately 29.5 MIPS performance, validated across the full industrial temperature range (–40°C to +85°C) and supply voltage (3.0 V to 5.5 V). The R4F24278DVFQU's CPG module allows dynamic clock switching between main and sub-clocks for low-power operation without compromising timing-critical peripheral functions.

Does the R4F24278DVFQU include an on-chip debug interface, and what protocols does it support?

Yes, the R4F24278DVFQU integrates a JTAG-compliant on-chip debug interface supporting real-time trace, hardware breakpoints, and watchpoint monitoring. It is fully compatible with Renesas' E2 emulator and third-party JTAG tools. The R4F24278DVFQU debug architecture enables non-intrusive firmware validation, live register inspection, and flash programming without requiring external debug probes - streamlining development for industrial control applications.

What are the memory specifications of the R4F24278DVFQU, and how is Flash endurance rated?

The R4F24278DVFQU includes 512 KB of on-chip Flash memory and 32 KB of RAM. Its Flash is rated for 10,000 write/erase cycles with data retention exceeding 20 years at 85°C. The R4F24278DVFQU supports sector-erase and byte-programming operations, and its Flash controller includes error detection logic to prevent corruption during power-loss events - critical for field-upgradable industrial firmware.

Which communication interfaces are integrated into the R4F24278DVFQU, and are they electrically isolated?

The R4F24278DVFQU integrates two SCI modules (UART-compatible), one I²C-compatible interface, and a CAN 2.0B controller. These are core logic-level peripherals - no galvanic isolation is built-in. External isolation (e.g., ISO1050 for CAN or ADuM1201 for SCI) must be added per system safety requirements. The R4F24278DVFQU's SCI modules support automatic baud-rate detection and LIN 2.1 frame formatting, enhancing interoperability in mixed-protocol industrial networks.

What is the ADC resolution and conversion speed of the R4F24278DVFQU, and how many input channels does it support?

The R4F24278DVFQU features an 8-channel, 10-bit successive-approximation ADC with a typical conversion time of 1.2 µs per sample. It supports both single-ended and differential input configurations, with hardware-triggered sampling synchronized to TPU events. The R4F24278DVFQU's ADC includes built-in offset calibration and sample-and-hold circuitry - enabling accurate current sensing and temperature monitoring in noisy motor drive environments without external signal conditioning.