The Atmel AVR Microcontroller: MEGA and XMEGA in Assembly and C (with Student CD-ROM) (Explore Our New Electronic Tech 1st Editions): Huang, Han-Way: 9781133607298: Amazon.com: Books
Programming ATxmega microcontrollers with USBASP programmer - Embedds
Explaining the XMega XPlained (Dev. Board) | Non-Lexical Vocables