Renesas R4F24278NVFQU

Overview

R4F24278NVFQU from Renesas Electronics is a 16-bit single-chip microcontroller in the H8S/2400 Series, implementing the H8S CPU core with on-chip flash memory, RAM, and integrated peripherals including TPU, SCI, WDT, and CPG. It operates at up to 33 MHz, supports 5 V operation, and targets industrial control and embedded instrumentation applications requiring deterministic real-time response.

For engineers reviewing the R4F24278NVFQU datasheet, R4F24278NVFQU pinout, R4F24278NVFQU application, or R4F24278NVFQU equivalent, key selection criteria include its 100-pin LQFP package, 512 KB on-chip flash, 32 KB RAM, 16-channel 16-bit timer pulse unit (TPU), dual asynchronous serial interfaces (SCI), and support for both normal and advanced CPU operating modes.

Technical Context

The R4F24278NVFQU implements the H8S/2427 variant of the H8S/2400 Series, featuring a 16-bit CISC CPU core with 24-bit address space, 32 general-purpose registers, and hardware multiply-accumulate capability. It integrates a clock pulse generator (CPG) supporting internal oscillators and external crystal inputs, plus a bus controller (BSC) enabling flexible memory mapping across ROM, RAM, and I/O spaces.

Peripheral integration includes two independent Serial Communication Interfaces (SCI) compliant with UART protocols, a 16-bit Timer Pulse Unit (TPU) with input capture, output compare, PWM generation, and phase counting functions, and a watchdog timer (WDT) with independent clock source and reset-on-timeout capability. All peripherals are memory-mapped and accessible via dedicated SFRs.

Key Specifications

Pinout & Package

Package: 100-pin LQFP (14 mm × 14 mm, 0.5 mm pitch), RoHS-compliant, plastic body with exposed thermal pad (not electrically connected).

Key Features

Applications

Equivalent & Alternatives

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

Compared with R4F24277NVFPU and R4F24258NVFQU, the R4F24278NVFQU delivers maximum on-chip memory and full peripheral complement in the 100-pin LQFP footprint, making it the optimal choice for complex, feature-rich embedded control where scalability and integration are critical.

Availability

R4F24278NVFQU is available at Aetrix Electronics and suitable for industrial motor control, factory automation I/O modules, and test & measurement instrumentation requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for R4F24278NVFQU 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 R4F24278NVFQU, was designed for deterministic real-time control in industrial equipment, offering high noise immunity, wide temperature tolerance, and integrated peripherals to minimize external components.

FAQ

What is the maximum operating frequency of the R4F24278NVFQU?

The R4F24278NVFQU operates at a maximum frequency of 33 MHz when supplied with a stable 5 V power source and using an appropriate external crystal or clock input. This frequency is supported across the full industrial temperature range (−40°C to +85°C) and enables sub-microsecond interrupt latency and tight control-loop timing for applications like motor commutation and power regulation. The R4F24278NVFQU achieves this via its on-chip clock pulse generator with configurable prescalers and PLL bypass options.

Does the R4F24278NVFQU include on-chip flash memory, and what is its capacity?

Yes, the R4F24278NVFQU integrates 512 KB of on-chip flash memory for program storage, which is sufficient to host complex firmware with real-time OS services, communication stacks, and application logic without requiring external memory. This flash supports in-system programming via on-chip boot ROM and includes security features such as write protection and read-out prevention. The R4F24278NVFQU's flash architecture is optimized for endurance and reliability in industrial environments with frequent firmware updates.

How many serial communication interfaces does the R4F24278NVFQU support, and what protocols do they implement?

The R4F24278NVFQU supports two independent Serial Communication Interfaces (SCI0 and SCI1), each implementing full-duplex UART functionality with programmable baud rates, framing options (data bits, stop bits, parity), and hardware error detection (framing, parity, overrun). Neither SCI supports synchronous SPI or I²C natively; they are strictly asynchronous UART peripherals. These interfaces enable simultaneous debug logging via SCI0 and fieldbus protocol implementation (e.g., Modbus RTU) over SCI1 in the R4F24278NVFQU-based design.

What timer resources are available on the R4F24278NVFQU for motor control applications?

The R4F24278NVFQU includes a 16-channel 16-bit Timer Pulse Unit (TPU) capable of input capture, output compare, PWM generation (edge- and center-aligned), and quadrature phase counting. For motor control, this allows direct generation of 6-channel complementary PWM with programmable dead time, precise encoder position tracking, and synchronized event triggering - all without external timing ICs. The R4F24278NVFQU's TPU is memory-mapped and fully controllable via SFRs, ensuring deterministic timing behavior critical for BLDC and PMSM drives.

Is the R4F24278NVFQU pin-compatible with other members of the H8S/2400 Series?

The R4F24278NVFQU is pin-compatible with other 100-pin LQFP variants in the H8S/2427 family, including R4F24277NVFPU and R4F24276NVFPU, sharing identical pin assignments for power, reset, clocks, and all I/O functions. However, it is not pin-compatible with H8S/2425-series parts like R4F24258NVFQU due to differences in peripheral signal routing and internal multiplexing - even though both use the same 100-pin LQFP package. Board designs targeting the R4F24278NVFQU must verify signal integrity and timing margins specific to its full peripheral complement.