This part is a kind of semiconductor called ATSAM3U2E.

Function of this product has SMART ARM-based Flash MCU.

Manufacturers : Atmel

Image and pinout :

Some of the text within the PDF file :

SAM3U Series Atmel | SMART ARM-based Flash MCU DATASHEET Description The Atmel® | SMART SAM3U series is a member of a family of Flash microcontrollers based on the high performance 32-bit ARM® Cortex®-M3 RISC processor. It operates at a maximum speed of 96 MHz and features up to 256 Kbytes of Flash and up to 52 Kbytes of SRAM. The peripheral set includes a High Speed USB Device Port with embedded transceiver, a High Speed MCI for SDIO/SD/MMC, an External Bus Interface with NAND Flash controller, up to 4 USARTs, up to 2 TWIs, up to 5 SPIs, as well as 4 PWM timers, one 3-channel 16bit general-purpose timer, a low-power RTC, a 12-bit ADC and a 10-bit ADC. The SAM3U devices have three software-selectable low-power modes: Sleep, Wait, and Backup. In Sleep mode, the processor is stopped while [ ... ]

ATSAM3U2E PDF Datasheet Download