Renesas Starter Kit for RX140

Overview

The Renesas Starter Kit for RX140 is an evaluation and starter kit for developers who are new to the RX140 MCU family (Program Flash 256KB, RAM 64KB, Pin Count 80-pin). The kit includes an LCD display module and an on-chip debugging emulator

MCU Native Pin Access

The RSK-RX140 includes:

48-MHz, 32-bit RX140 MCU (R5F51406BDFN, 80-pin LFQFP package)
Direct MCU pin access through standard headers for easy peripheral integration
On-board 8 MHz crystal, 32.768 kHz sub-clock, and internal oscillators
Multiple low power consumption modes

System Control and Debugging

USB Mini-B connector for serial communication (via on-board RL78/G1C USB-to-Serial MCU)
Power source options:
- USB-powered
- External DC supply (5V input jack)
- Debugger supply (E2 Lite)
Debugging support:
- Via E2 Lite debugger (14-pin connector)
User LEDs and buttons:
- Four User LEDs (green, orange, red x2)
- Power LED (green)
- One Reset button, three User buttons
- One potentiometer (connected to ADC input)
Ecosystem expansions:
- Two Digilent Pmod connectors (LCD and Spare)
- On-board 2Kbit I2C EEPROM

Special Feature Access

Capacitive touch sensing (slider x1, buttons x2)
CAN and LIN transceivers
IEC60730 compliance support
Security functions (built-in Trusted Secure IP)

Hardware

Detailed hardware features can be found at:

RX140 MCU: RX140 Group User’s Manual Hardware
RSK-RX140: RSK_RX140 - User’s Manual

Supported Features

The rsk_rx140 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.

`rsk_rx140/r5f51406bdfn` target

Type	Location	Description	Compatible
CPU	on-chip	Renesas RXv2 CPU1	`renesas,rxv2`
ADC	on-chip	Renesas RX ADC1	`renesas,rx-adc`
Clock control	on-chip	Renesas RX Root Clock Generation Circuit4 1	`renesas,rx-cgc-root-clock`
	on-chip	Renesas RX Clock Generation Circuit PLL Clock1	`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 Clock4 7	`renesas,rx-cgc-pclk`
Flash controller	on-chip	Renesas RX Flash controller1	`renesas,rx-flash`
GPIO & Headers	on-chip	Renesas RX series GPIO2 11	`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 Interrupt1 7	`renesas,rx-external-interrupt`
	on-chip	Renesas RX SCI controller1 5	`renesas,rx-sci`
	on-chip	Renesas RX MTU controller5	`renesas,rx-mtu`
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`
PWM	on-chip	Renesas PWM RX Controller1 4	`renesas,rx-mtu-pwm`
Renesas RX	on-chip	Renesas RX SWINT (Software Interrupt)1	`renesas,rx-swint`
Serial controller	on-chip	Renesas RX SCI UART controller1 5	`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 1	`renesas,rx-timer-cmt`
Watchdog	on-chip	Renesas RX Independent Watchdog1	`renesas,rx-iwdt`

Programming and Debugging

The rsk_rx140 board supports the runners and associated west commands listed below.

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

Applications for the rsk_rx140 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 RSK-RX140 using the E2 Lite debugger by connecting the board’s 14-pin debug connector to the host PC. Here’s an example for building and flashing the Hello World application.

# From the root of the zephyr repository
west build -b rsk_rx140 samples/hello_world
west flash

Debugging

You can use Renesas Debug extension on Visual Studio Code for a visual debug interface. The configuration for launch.json is as below.

{
  "version": "0.2.0",
  "configurations": [
      {
          "type": "renesas-hardware",
          "request": "launch",
          "name": "RX140 Renesas Debugging E2lite",
          "target": {
              "deviceFamily": "RX",
              "device": "R5F51406",
              "debuggerType": "E2LITE"
              "serverParameters": [
                  "-uUseFine=", "1",
                  "-w=", "0",
              ],
          }
      }
  ]
}