Overview

The ATmega8U2/16U2/32U2 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.

Features

• High Performance, Low Power AVR® 8-Bit Microcontroller

• Advanced RISC Architecture

– 125 Powerful Instructions – Most Single Clock Cycle Execution

– 32 x 8 General Purpose Working Registers

– Fully Static Operation

– Up 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 at 85C/ 100 years at 25OC(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 2.0

– 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 8 up to 64-bytes

– 4 Programmable Endpoints:

IN or Out Directions

Bulk, Interrupt and IsochronousTransfers

Programmable maximum packet size from 8 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

– QFN32 (5x5mm) / TQFP32 packages

• Operating Voltages

– 2.7 - 5.5V

• Operating temperature

– Industrial (-40°C to +85°C)

• Maximum Frequency

– 8 MHz at 2.7V - Industrial range

– 16 MHz at 4.5V - Industrial range

Note: 1. See “Data Retention” on page 6for details.