Small breakout board designed for the SAM D20 and SAM D21 ARM Cortex-M0+ microcontrollers from Microchip
Features
minimal subset of components, no power regulation etc.
optional external main and real-time crystals - if not used, their GPIO pins can be connected to the user header by soldering relevant 0R resistors (see schematic)
one buffered user LED, connected to the header - no reserved GPIO
reset button
standard 0.05" pitch SWD programming header, SWD signals also present on the pin headers
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