User Manual

At the Feather M0's heart is an ATSAMD21G18 ARM Cortex M0 processor, clocked at 48 MHz and at 3.3V logic, the

same one used in the new Arduino Zero (http://adafru.it/2843). This chip has a whopping 256K of FLASH (8x more

than the Atmega328 or 32u4) and 32K of RAM (16x as much)! This chip comes with built in USB so it has USB-to-Serial

program & debug capability built in with no need for an FTDI-like chip. For advanced users who are comfortable with

ASF, the SWDIO/SWCLK pins are available on the bottom, and when connected to a CMSIS-DAP debugger can be

used to use Atmel Studio for debugging.

To make it easy to use for portable projects, we added a connector for any of our 3.7V Lithium polymer batteries and

built in battery charging. You don't need to use a battery, it will run just fine straight from the micro USB connector. But,

if you do have a battery, you can take it on the go, then plug in the USB to recharge. The Feather will automatically