Microchip ATMEGA32U4-MUR, 8bit ATmega328 Microcontroller, ATmega, 16MHz, 32 Kb EEPROM, 32-Pin QFP

The Microchip Low power Microchip 8 bit AVR RISC based microcontroller featuring 32 KB self programming Flash program memory, 2.5 KB SRAM, 1 KB EEPROM, USB 2.0 full speed/low speed device, 12 channel 10 bit A/D converter, and JTAG interface for on chip debug. The device achieves up to 16 MIPS throughput at 16 MHz. 2.7 to 5.5 volt operation.

CPU Reset possible on USB Bus Reset detection
48 MHz from PLL for Full Speed Bus Operation
USB Bus Connection/Disconnection on Microcontroller Request
Crystal less operation for Low Speed mode