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Overview

boards/renesas/fpb_rx261/doc/index.rst

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.. zephyr:board:: fpb_rx261

Overview

The FPB-RX261 is a Fast Prototyping Board for the Renesas RX261 MCU Group, designed to evaluate features of the RX261 family and accelerate embedded system development. The board includes native MCU pin access, integrated debugger, power flexibility, and expansion connectors.

The key features of the FPB-RX261 board are categorized in two groups:

MCU Native Pin Access

  • R5F52618BGFP MCU
  • 64 MHz Renesas RXv3-based RX261 MCU in 100-pin LFQFP package
  • 512 KB Code Flash, 8 KB Data Flash, 128 KB RAM
  • Native pin access through 2 x 50-pin male headers (not fitted)
  • MCU current measurement point for precision current consumption measurement
  • RX MCU on-chip oscillators as main clock
  • Providing 32.768 kHz crystal oscillator as sub clock

System Control and Ecosystem Access

  • 5V input sources:

    • USB (USB DEBUG1 - J5)
    • External 5V via 2-pin header (J8)

  • On-board debugger via E2 Emulator OB (FINE interface)

  • User LEDs:

    • 2 Green User LEDs (PJ1, PC5)
    • 1 Green Power LED
    • 1 Yellow Debug LED

  • User Buttons:

    • 1 User Switch (S1 - P32)
    • 1 Reset Switch (S2)

  • Popular expansion connectors:

    • 2x Digilent Pmod connectors (J13, J14 - UART/SPI/I2C)
    • Arduino Uno R3-compatible header (J9-J12)

Hardware

Detailed hardware features can be found at:

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

Supported Features

.. zephyr:board-supported-hw::

Other hardware features are currently not supported by the port.

Programming and Debugging

.. zephyr:board-supported-runners::

Applications for the fpb_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

The program can be flashed to FPB-RX261 via the on-board E2 Emulator OB.

  1. Connect the board:

    • Use USB DEBUG1 (J5) to connect the on-board E2 Emulator to the PC

  2. Configure jumpers for flashing:

    • J4: Jumper on pins 2-3 (enable E2 OB)
    • J7: Jumper on pins 1-2 (3.3V system voltage)

  3. Run flashing command:

    .. code-block:: console

    west flash

    Or use Renesas Flash Programmer with settings:

    • Debugger: E2 Emulator Lite
    • Interface: FINE
    • MCU: R5F52618

Debugging

Debugging is supported via:

  • On-board E2 Emulator OB using USB DEBUG1 (J5)

To use debugger:

  • J4: Jumper on pins 2-3 (enable E2 OB)
  • J7: Jumper on pins 1-2 (3.3V)
  • LED4 (Yellow) indicates debugger status

Note: Only one FPB-RX261 board can be debugged per PC at a time using E2 OB.

References

  • FPB-RX261 Website_
  • RX261 MCU group Website_

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

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

.. _FPB-RX261 - User's Manual: http://renesas.com/en/document/mat/fpb-rx261-v1-users-manual?r=25565483

.. _RX261 Group User's Manual Hardware: https://www.renesas.com/en/document/mah/rx260-group-rx261-group-users-manual-hardware?r=25565707