Adafruit Feather M0 Basic Proto – ATSAMD21 Cortex M0 [ADA2772]

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ATSAMD21G18 ARM Cortex M0 processor – the same one used in the Arduino Zero
256K of FLASH (8x more than the Atmega328 or 32u4) and 32K of RAM (16x as much)
Built in USB so it has USB-to-Serial program & debug capability built in with no need for an FTDI-like chip


ATSAMD21G18 @ 48MHz with 3.3V logic/power
256KB of FLASH + 32KB of RAM
32.768 KHz crystal for clock generation & RTC
3.3V regulator with 500mA peak current output
USB native support, comes with USB bootloader and serial port debugging

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