Datasheet

256KB of FLASH + 32KB of RAM

No EEPROM

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

You also get tons of pins - 20 GPIO pins

Hardware Serial, hardware I2C, hardware SPI support

PWM outputs on all pins

6 x 12-bit analog inputs

1 x 10-bit analog ouput (DAC)

Built in 100mA lipoly charger with charging status indicator LED

Pin #13 red LED for general purpose blinking

Power/enable pin

4 mounting holes

Reset button

The Feather M0 Express uses the extra space left over to add a Mini NeoPixel, 2 MB SPI Flash storage and a little

prototyping space. You can use the SPI Flash storage like a very tiny hard drive. When used in Circuit Python, the 2

MB flash acts as storage for all your scripts, libraries and files. When used in Arduino, you can read/write files to it, like

a little datalogger or SD card, and then with our helper program, access the files over USB.

https://learn.adafruit.com/adafruit-feather-m0-express-designed-for-circuit-python-

circuitpython

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