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Seeeduino XIAO


The Seeeduino XIAO is an Arduino like board based on the SAMD21G18 chip (ARM Cortex-M0+, 32bit, 48MHz), similar to the Arduino MKR ZERO.

Seeeduino XIAO Wiki

All I/O Pins are 3.3V


Pinout


pinout by Seeed Studio



Reset & Bootloader Mode


To reset the board one should short out the reset pins.
And to enter the bootloader mode one should short them out twice.


Serial Wire Debug (SWD)