Features
• Atmel ATSAMR21G18A microcontroller
• Embedded debugger (EDBG)
– USB interface
– Programming and debugging on board SAM R21 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
– Two extension headers
• Antenna
– One ceramic chip antenna (2450AT18D0100)
– One SMA connector for external antenna
• Three possible power sources
– External power
– Embedded debugger USB
– Target USB
• 32kHz crystal
• 16MHz crystal
• USB interface, device