Arduino Uno R4 Minima

The Arduino Uno R4 Minima is a development board based on the Renesas RA4M1 32-bit ARM Cortex-M4 microcontroller with 32KB of SRAM and 256KB of flash.

Interfaces

Interface	Hardware Supported	TinyGo Support
GPIO	YES	YES
UART	YES	YES
SPI	YES	Not yet
I2C	YES	Not yet
ADC	YES	YES
PWM	YES	Not yet
USBDevice	YES	Not yet

Pins

Pin	Hardware pin	Alternative names
`D0`	`P3_01`	`UART_RX_PIN`, `UART1_RX_PIN`
`D1`	`P3_02`	`UART_TX_PIN`, `UART1_TX_PIN`
`D2`	`P1_05`
`D3`	`P1_04`	`PWM_D3_PIN`
`D4`	`P1_03`	`CAN_TX_PIN`, `ADC_CH19_PIN`
`D5`	`P1_02`	`PWM_D5_PIN`, `CAN_RX_PIN`, `ADC_CH20_PIN`
`D6`	`P1_06`	`PWM_D6_PIN`
`D7`	`P1_07`
`D8`	`P3_04`
`D9`	`P3_03`	`PWM_D9_PIN`
`D10`	`P1_12`	`PWM_D10_PIN`, `SPI_CS_PIN`
`D11`	`P1_09`	`PWM_D11_PIN`, `SPI_SDO_PIN`
`D12`	`P1_10`	`SPI_SDI_PIN`
`D13`	`P1_11`	`LED`, `SPI_SCK_PIN`
`D14`	`P0_14`	`A0`, `DAC0_PIN`, `ADC_CH9_PIN`
`D15`	`P0_00`	`A1`, `ADC_CH0_PIN`
`A2`	`P0_01`	`ADC_CH1_PIN`
`A3`	`P0_02`	`ADC_CH2_PIN`
`A4`	`P1_01`	`SDA_PIN`, `ADC_CH21_PIN`
`A5`	`P1_00`	`SCL_PIN`, `ADC_CH22_PIN`
`SWDIO_PIN`	`P1_08`
`SWCLK_PIN`	`P3_00`
`LED_TX`	`P0_12`
`LED_RX`	`P0_13`
`UART_SWD_TX_PIN`	`P5_01`	`ADC_CH17_PIN`
`UART_SWD_RX_PIN`	`P5_02`	`ADC_CH18_PIN`
`AVCC_MEASURE_PIN`	`P5_00`	`ADC_CH16_PIN`

Machine Package Docs

Documentation for the machine package for the Arduino Uno R4 Minima

Flashing

CLI Flashing

The Uno R4 Minima is flashed using dfu-util.

Plug your Uno R4 Minima board into your computer’s USB port.
Double tap the reset button to enter the bootloader.
Build and flash your TinyGo code using the tinygo flash command. This command flashes the board with the blinky example:
```
tinygo flash -target=arduino-uno-r4-minima examples/blinky1
```
The Uno R4 Minima board should restart and then begin running your program.

Notes

The serial console uses UART1 on the D0 and D1 header pins, not the USB port.

Last modified October 28, 2026: docs: update machine docs for 0.44.0 release (b77bfd3)