RX261 Fast Prototyping Board

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

The fpb_rx261 board supports the hardware features listed below.

on-chip / on-board: Feature integrated in the SoC / present on the board.
2 / 2: Number of instances that are enabled / disabled.
Click on the label to see the first instance of this feature in the board/SoC DTS files.
vnd,foo: Compatible string for the Devicetree binding matching the feature.
Click on the link to view the binding documentation.

`fpb_rx261/r5f52618bgfp` target

Type	Location	Description	Compatible
CPU	on-chip	Renesas RXv3 CPU1	`renesas,rxv3`
ADC	on-chip	Renesas RX ADC1	`renesas,rx-adc`
Clock control	on-chip	Renesas RX Root Clock Generation Circuit3 2	`renesas,rx-cgc-root-clock`
	on-chip	Renesas RX Clock Generation Circuit PLL Clock2	`renesas,rx-cgc-pll`
	on-chip	Renesas RX clock control node pclk block1	`renesas,rx-cgc-pclk-block`
	on-chip	Renesas RX Clock Control Peripheral Clock5 12	`renesas,rx-cgc-pclk`
Flash controller	on-chip	Renesas RX Flash controller1	`renesas,rx-flash`
GPIO & Headers	on-chip	Renesas RX series GPIO4 9	`renesas,rx-gpio`
I2C	on-chip	Renesas RX I2C Master controller1	`renesas,rx-i2c`
Input	on-board	Group of GPIO-bound input keys1	`gpio-keys`
Interrupt controller	on-chip	Renesas ICU Interrupt controller1	`renesas,rx-icu`
LED	on-board	Group of GPIO-controlled LEDs1	`gpio-leds`
Miscellaneous	on-chip	Renesas RX Data Transfer Controller (DTC)1	`renesas,rx-dtc`
	on-chip	Renesas RX External Interrupt2 6	`renesas,rx-external-interrupt`
	on-chip	Renesas RX SCI controller1 3	`renesas,rx-sci`
MTD	on-chip	Flash memory binding of Renesas RX family2	`renesas,rx-nv-flash`
MTD	on-board	Fixed partitions of a flash (or other non-volatile storage) memory1	`fixed-partitions`
Pin control	on-chip	Renesas RX Pin Controller1	`renesas,rx-pinctrl`
Pin control	on-chip	Rensas RX Pinmux (Multi Function Pin Controller, MPC)13	`renesas,rx-pinmux`
Renesas RX	on-chip	Renesas RX SWINT (Software Interrupt)1	`renesas,rx-swint`
Serial controller	on-chip	Renesas RX SCI UART controller1 3	`renesas,rx-uart-sci`
SPI	on-chip	Renesas RX RSPI1	`renesas,rx-rspi`
SRAM	on-chip	Generic on-chip SRAM1	`mmio-sram`
Timer	on-chip	Renesas RX timer node1	`renesas,rx-timer-cmt-start-control`
Timer	on-chip	Renesas RX timer node1 3	`renesas,rx-timer-cmt`

Other hardware features are currently not supported by the port.

Programming and Debugging

The fpb_rx261 board supports the runners and associated west commands listed below.

	flash	debug	attach	debugserver	reset	rtt
jlink	✅	✅ (default)	✅	✅	✅	✅
rfp	✅ (default)

Applications for the fpb_rx261 board can be built, flashed, and debugged using standard Zephyr workflows. Refer to Building an Application and Run an Application for more details.

Flashing

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

Renesas Flash Programmer (RFP) can be used with the on-board debugger https://www.renesas.com/software-tool/renesas-flash-programmer-programming-gui

Connect the board:
- Use USB DEBUG1 (J5) to connect the on-board E2 Emulator to the PC
Configure jumpers for flashing:
- J4: Jumper on pins 2-3 (enable E2 OB)
- J7: Jumper on pins 1-2 (3.3V system voltage)
Run flashing command:
```
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.