This board carries an Atmel ATXMega128A4U microcontroller. It fits directly on most breadboards. Load your firmware via PDI or with the preinstalled original Atmel USB-DFU-Loader (Flip).Check out all details, schematic and layout. Features micro-USB, ESD protected 4 MHz Crystal RX and TX LEDs for serial port PDI header all filter and protection parts on board. 3.3 V single supply