This part is a kind of semiconductor called ATxmega128A1U.

Function of this product has 8/16-bit Atmel XMEGA A1U Microcontroller.

Manufacturers : ATMEL

Image and pinout :

Some of the text within the PDF file :

Features 8/16-bit Atmel XMEGA A1U Microcontroller ATxmega128A1U / ATxmega64A1U z High-performance, low-power Atmel® AVR® XMEGA® 8/16-bit Microcontroller z Nonvolatile program and data memories z 64K - 128KBytes of in-system self-programmable flash z 4K - 8KBytes boot section z 2KBytes EEPROM z 4K - 8KBytes internal SRAM z External bus interface for up to 16Mbytes SRAM z External bus interface for up to 128Mbit SDRAM z Peripheral features z Four-channel DMA controller z Eight-channel event system z Eight 16-bit timer/counters z Four timer/counters with 4 output compare or input capture channels z Four timer/counters with 2 output compare or input capture channels z High resolution extension on all timer/counters z Advanced waveform extension (AWeX) on two timer/counters z One USB devic [ ... ]

ATxmega128A1U PDF Datasheet Download