The EK-RX671 is the evaluation kit for the RX671 MCU, providing an efficient tool to evaluate the RX671 MCU. This kit comes with all the hardware and software needed to start evaluation immediately after unboxing.

The EK-RX671 enables debugging key functions of the RX671. In addition, it could be combined with various expansion boards quickly to easily expand the board's functionality.

This board features:

  • Hardware and software ready for evaluation right out of the box
    • On-board debugger (E2 OB): program writing and debugging are possible simply by connecting the board to a PC via USB cable.
    • Ready-to-use software package includes peripheral function drivers, middleware, and guidance documentation.
  • Ability to develop prototypes for a wide range of requirements.
    • On-board popular ecosystem connectors: easily integrate with expansion boards such as sensor, wireless, LCD, motor boards, etc, enabling to develop wide range of application quickly.
    • On-board HMI application target function: 2 capacitive touch buttons, Audio Interface with MEMS micros and 3.5mm headphone jack enable to evaluate HMI functions
    • Rich external memory expansion function: 64Mb QSPI Flash, 128Mb 16-bit SDRAM, MicroSD Slot enable expanding memory easily
    • Multiple power options to enhance power supply flexibility to meet various needs.

Getting Started

Developing Embedded Application

The software development to evaluate RX671 MCU’s function could be started immediately using the e2 studio IDE and the RX software package that includes peripheral function drivers, middleware, and usage documentation.

  1. Get familiar with EK-RX671 through the Quick Start example project –The Quick Start example project shows:
    • Communication between EK-RX671 and Host PC through USB to Serial interface
    • Control User LEDs via User Buttons
    • Quad-SPI Flash Read/Write Operation via QSPI
    Refer to the EK-RX671 Quick Start Guide for details.
  2. Start with one of the application projects – Choose from application projects to learn about the different peripherals of the RX671 MCU Group. The number of projects will grow progressively over time. These example projects can be downloaded from “Design & Development” and serve as excellent starting points for you to develop your custom applications.
    • Audio Output/Input project via Serial Sound Interface (SSIE)
    • HMI application project demonstrating SPI LCD display and Cap Touch functions.

Building a Custom Hardware

  1. Start by building a functional prototype – Utilize the EK-RX671 board with your choice of hundreds of popular ecosystem add-ons.
  2. Build custom hardware – Develop custom hardware by referring to the design and manufacturing information provided in the EK-RX671 Design Package.


  • Ecosystem & System Control
    • USB Full Speed host and device
    • USB-Serial Converter Interface
    • Multiple 5V input sources
      • USB (Debug, Full Speed)
      • External power supply
    • E2 OB on-board programmer and debugger
    • Debug modes
      • Debug On-board (FINE) – via E2 OB
      • Debug In (JTAG or FINE Interface)
    • User LEDs and buttons
      • Three user LEDs (red, blue, green)
      • Power LED (white) indicating availability of regulated power
      • Debug LED (yellow) indicating the debug connection
      • Two user buttons
      • One reset button
    • Five most popular ecosystem expansions
    • MCU mode configuration switch
  • Special Features
    • Audio Interface
    • 128Mb SDRAM
    • 64Mb External Quad-SPI Flash
    • MicroSD Card Slot
    • 2 Capacitive Touch Buttons
  • MCU Native Pin
    • R5F5671EHDFB MCU
    • 120MHz, RXv3 core
    • 2MB Code Flash, 384KB SRAM
    • 144 pins, LFQFP package
    • Native pin access through male pin headers
    • MCU current measurement
  • Kit Contents: EK-RX671 board, Micro USB device cable (type-A male to micro-B male), Micro USB host cable (type-A female to micro-B male)



Type Title Date
Quick Start Guide PDF 1.58 MB 日本語
Manual - Development Tools PDF 1.54 MB 日本語
Schematic Log in to Download ZIP 60.09 MB
Application Note PDF 856 KB 日本語
Application Note PDF 1.90 MB 日本語
5 items

Design & Development

Software & Tools

Software & Tools

Software title
Software type
Cyberon D-Spotter Modeling Tool (DSMT)
Wake-word and commands customization, performance tuning, and testing tools with no-prior neural network knowledge needed
Solution Toolkit Cyberon Corporation
C/C++ Compiler Package for RX Family [CC-RX]
C/C++ Compiler Package for RX Family [IDE: CS+, e² studio, High-performance Embedded Workshop]
Compiler/Assembler Renesas
Quick-Connect Platform
Quick-Connect platform enables fast prototyping by providing compatible hardware and software building blocks.
Other Hardware Renesas
e² studio - Information for the RX Family
Eclipse-based Renesas integrated development environment (IDE).
IDE and Coding Tool Renesas
Renesas Flash Programmer (Programming GUI)
Flash memory programming software [Support MCU/MPU and devices: RA, RE, RX, RL78, RH850, RISC-V MCU Renesas Synergy, DA1459x, DA1469x, DA1470x, Power Management, Renesas USB Power Delivery Family, ICs for Motor Driver/Actuator Driver, V850, 78K0R, 78K0]
Programmer (Unit/SW) Renesas
QE for Capacitive Touch: Development Assistance Tool for Capacitive Touch Sensors
In developing embedded system using the capacitive touch sensor of MCUs, you can easily setup initial configurations of the touch interface as well as process the tuning of sensors, and reduce development time. [Plugin for Renesas IDE "e2 studio"] [Standalone Version] [Support MCU/MPU:RA, RL78, RX, Renesas Synergy™]
Solution Toolkit Renesas
Flash memory programmer [Programming software: Dedicated GUI-based software, the "FP6 Terminal"] [Support MCU/MPU and devices: RA, RE, RX, RL78, RH850, RISC-V MCU, Renesas Synergy, Power Management, Renesas USB Power Delivery Family, ICs for Motor Driver/Actuator Driver, SuperH RISC engine, V850, 78K, R8C]
Programmer (Unit/SW) Renesas
E2 emulator Lite [RTE0T0002LKCE00000R]
On-chip debugging emulator. Also available as a flash memory programmer. [Support MCU/MPU: RA, RE, RL78, RX, RISC-V MCU]
Emulator Renesas
E2 emulator [RTE0T00020KCE00000R]
On-chip debugging emulator. Also available as a flash memory programmer. [Support MCU/MPU: RA, RE, RH850, R-Car D1, RL78, RX, RISC-V MCU]
Emulator Renesas
9 items

Software Downloads

Type Title Date
Board Description File ZIP 2 KB
1 item

Sample Code

Related Boards & Kits

Boards & Kits


The EK-RX671 meets the following certifications/standards. Refer to the EK-RX671 user manual for the disclaimer, precautions, and more details on the certifications.

EMC/EMI Standards

  • FCC Notice (Class A) – Part 15
  • Innovation, Science and Economic Development Canada ICES-003 Compliance: CAN ICES-3 (A)/NMB-3(A)
  • CE Class A (EMC Directive 2004/108/EEC)
  • Taiwan Chinese National Standard 13438, C6357 compliance, Class A limits
  • Australia/New Zealand AS/NZS CISPR 32:2015, Class A

Material Selection, Waste, Recycling, and Disposal Standards

  • EU RoHS
  • China SJ/T 113642014, 10-year environmental protection use period.

Safety Standards

  • UL 94V-0