The Atmel AVR Microcontroller: MEGA and XMEGA in Assembly and C (Book Only) (Explore Our New Electronic Tech 1st Editions): Huang, Han-Way: 9781133607281: Amazon.com: Books
Avr Xmega Special Emulator Supports Programming and Debugging of PDI Interface (programming and Simulation) - AliExpress
Batsocks - AVR XMega example code
atxmega128a3-au mcu 8/16 bit 1.6v-3.6v 128kb| Alibaba.com