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Overview

boards/renesas/ek_rx261/doc/index.rst

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.. zephyr:board:: ek_rx261

Overview

The EK-RX261 is an Evaluation Kit for the Renesas RX261 MCU Group, designed to evaluate features of the RX261 family and accelerate embedded system development. The board includes rich interfaces, peripheral connectors, and expansion support for popular ecosystem modules.

The key features of the EK-RX261 board are categorized in three groups:

MCU Native Pin Access

  • RX261 MCU (R5F52618BGFP), 32-bit RXv3 core at 64MHz
  • 512KB Code Flash, 8KB Data Flash, 128KB RAM
  • Native pin access through 6 x 2-pin and 14 x 2-pin x 3-piece male headers
  • MCU current measurement points for current consumption measurement
  • Precision 8.000MHz main oscillator and 32.768kHz sub-clock

System Control and Ecosystem Access

  • Four 5V input sources:

    • USB (USB DEBUG1, USB FULL SPEED, USB SERIAL)
    • External power supply (via TP5, TP6)

  • Two Debug Modes:

    • Debug on-board via E2 Emulator OB (FINE interface)
    • Debug in via 14-pin external header (FINE interface)

  • User LEDs:

    • 3 User LEDs (Red, Green, Blue)
    • 1 Power LED (White)
    • 1 Debug LED (Yellow)

  • User Buttons:

    • 2 User Switches
    • 1 Reset Switch

  • Popular ecosystem expansion connectors:

    • 2x Grove connectors (I2C / Analog)
    • 1x SparkFun Qwiic connector (I2C)
    • 2x Digilent Pmod connectors (UART/SPI/I2C)
    • Arduino Uno R3-compatible header
    • mikroBUS connector

  • USB Full Speed Host and Device (micro-B connector)

  • USB to Serial communication via FT234XD

Special Feature Access

  • CAN FD transceiver with 3-pin header
  • Touch interface (2 buttons)

Hardware

Detailed hardware features can be found at:

  • RX261 MCU: RX261 Group User's Manual Hardware_.
  • EK-RX261 board: EK-RX261 - User's Manual_.

Supported Features

.. zephyr:board-supported-hw::

Programming and Debugging

.. zephyr:board-supported-runners::

Applications for the ek_rx261 board can be built, flashed, and debugged using standard Zephyr workflows. Refer to :ref:build_an_application and :ref:application_run for more details.

Flashing

Program can be flashed to EK-RX261 via either the on-board E2 Emulator OB or an external SEGGER J-Link debugger (using the FINE interface).

  1. Connect to the debugger:

    • For E2 Emulator OB: connect USB DEBUG1 (J26)
    • For J-Link: connect to 14-pin FINE header (J27)

  2. Set jumper configuration according to the selected flash mode:

    • E2 Emulator OB (on-board):

      • J22: Open
      • J23: Jumper on pins 2-3
      • J24: Open
      • J25: Open

    • J-Link (external debugger):

      • J22: Open
      • J23: Jumper on pins 1-2 or 2-3
      • J24: Closed
      • J25: Open

  3. Run flashing command:

    .. code-block:: console

    west flash # For E2 Emulator OB west flash -r jlink # For J-Link (external debugger)

Debugging

The EK-RX261 supports debugging through:

  • On-board E2 Emulator OB (via USB DEBUG1)
  • External debugger using the 14-pin FINE header (J27)

To use on-board E2 Emulator:

  • J22: Open
  • J23: Jumper on pins 2-3
  • J24: Open
  • J25: Open

To use external debugger:

  • J24: Closed
  • J22: Open
  • J23: Jumper on pins 1-2 or 2-3 (depending on desired pull-up/down)
  • J25: Open

Note: External debugger (e.g., E2 Lite) cannot power the board. Supply external 5V via USB or TP5/TP6.

References

  • EK-RX261 Website_
  • RX261 MCU group Website_

.. _EK-RX261 Website: https://www.renesas.com/en/design-resources/boards-kits/ek-rx261

.. _RX261 MCU group Website: https://www.renesas.com/en/products/rx261

.. _EK-RX261 - User's Manual: https://www.renesas.com/en/document/mat/ek-rx261-v1-users-manual

.. _RX261 Group User's Manual Hardware: https://www.renesas.com/en/document/mah/rx260-group-rx261-group-users-manual-hardware