Atmel ATSAMD20J18A microcontroller
Embedded debugger (EDBG)
USB interface
Programming and debugging on board SAM D20 through Serial Wire Debug (SWD)
Programming and debugging external targets through Serial Wire Debug (SWD)
Virtual COM-port interface to target via UART
Atmel Data Gateway Interface (DGI) to target via SPI and TWI
Four GPIOs connected to target for code instrumentation
Digital I/O
Two mechanical buttons (user and reset button)
One user LED
Three extension headers
Two possible power sources
External power
Embedded debugger USB
32kHz crystal