Atmel® ATmega256RFR2 microcontroller
Embedded Debugger (EDBG)
USB interface
Programming and debugging (target) through JTAG
Virtual COM-port interface to target via UART
Atmel Data Gateway Interface (DGI) to target via SPI or TWI
Four GPIOs connected to target for code instrumentation
Digital I/O
Two mechanical buttons (user and reset button)
One user LED
Five extension headers
Antenna
One ceramic chip antenna (2450BM15A0015E)
One SMA connector for external antenna
Temperature sensor and EEPROM (AT30TSE758)
External power
Embedded debugger USB
16MHz crystal
32kHz crystal