Features
· High Performance, Low Power AVR® 8-Bit Microcontroller· Advanced RISC Architecture

­ 125 Powerful Instructions ­ Most Single Clock Cycle Execution x 8 General Purpose Working Registers ­ Fully Static Operation to 16 MIPS Throughput at 16 MHz· Non-volatile Program and Data Memories ­ 8K/16K/32K Bytes of In-System Self-Programmable Flash ­ 512/512/1024 EEPROM ­ 512/512/1024 Internal SRAM ­ Write/Erase Cycles: 10,000 Flash/ 100,000 EEPROM ­ Data retention: 20 years 85°C/ 100 years 25°C(1) ­ Optional Boot Code Section with Independent Lock Bits In-System Programming by on-chip Boot Program hardware-activated after reset True Read-While-Write Operation ­ Programming Lock for Software Security· USB 2.0 Full-speed Device Module with Interrupt on Transfer Completion ­ Complies fully with Universal Serial Bus Specification REV ­ 48 MHz PLL for Full-speed Bus Operation : data transfer rates at 12 Mbit/s ­ Fully independant 176 bytes USB DPRAM for endpoint memory allocation ­ Endpoint 0 for Control Transfers: from ­ 4 Programmable Endpoints: IN or Out Directions Bulk, Interrupt and IsochronousTransfers Programmable maximum packet size from to 64 bytes Programmable single or double buffer ­ Suspend/Resume Interrupts ­ Microcontroller reset on USB Bus Reset without detach ­ USB Bus Disconnection on Microcontroller Request· Peripheral Features ­ One 8-bit Timer/Counters with Separate Prescaler and Compare Mode (two 8-bit PWM channels) ­ One 16-bit Timer/Counter with Separate Prescaler, Compare and Capture Mode (three 8-bit PWM channels) ­ USART with SPI master only mode and hardware flow control (RTS/CTS) ­ Master/Slave SPI Serial Interface ­ Programmable Watchdog Timer with Separate On-chip Oscillator ­ On-chip Analog Comparator ­ Interrupt and Wake-up on Pin Change· On Chip Debug Interface (debugWIRE)· Special Microcontroller Features ­ Power-On Reset and Programmable Brown-out Detection ­ Internal Calibrated Oscillator ­ External and Internal Interrupt Sources ­ Five Sleep Modes: Idle, Power-save, Power-down, Standby, and Extended Standby· I/O and Packages ­ 22 Programmable I/O Lines / TQFP32 packages· Operating Voltages - 5.5V· Operating temperature ­ Industrial to +85°C)· Maximum Frequency ­ 8 MHz 2.7V - Industrial range ­ 16 MHz 4.5V - Industrial range Note: 1. See "Data Retention" on page 6 for details.

8-bit Microcontroller with 8/16/32K Bytes of ISP Flash and USB Controller ATmega16U2 ATmega32U2 Summary

AIN3) PD4 (XCK INT3) PD3 (CTS / HWB INT7) PD7 (SCLK PCINT1) PB1 (PDI / MOSI PCINT2) PB2 (RTS INT6) PD6 (SS PCINT0) PB0 UGND AVCC UVCC DD+

The large center pad underneath the VQFP and QFN package should be soldered to ground on the board to ensure good mechanical stability.

Typical values contained in this datasheet are based on simulations and characterization of other AVR microcontrollers manufactured on the same process technology. Min and Max values will be available after the device is characterized.

The is a low-power CMOS 8-bit microcontroller based on the AVR enhanced RISC architecture. By executing powerful instructions in a single clock cycle, the ATmega8U2/16U2/32U2 achieves throughputs approaching 1 MIPS per MHz allowing the system designer to optimize power consumption versus processing speed.

The AVR core combines a rich instruction set with 32 general purpose working registers. All the 32 registers are directly connected to the Arithmetic Logic Unit (ALU), allowing two independent registers to be accessed in one single instruction executed in one clock cycle. The resulting