Features

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

• Advanced RISC Architecture

– 135 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

– On-Chip 2-cycle Multiplier

• Non-volatile Program and Data Memories

– 16/32K Bytes of In-System Self-Programmable Flash (ATmega16U4/ATmega32U4)

– 1.25/2.5K Bytes Internal SRAM (ATmega16U4/ATmega32U4)

– 512Bytes/1K Bytes Internal EEPROM (ATmega16U4/ATmega32U4)

– Write/Erase Cycles: 10,000 Flash/100,000 EEPROM

– Data retention: 20 years at 85°C/ 100 years at 25°C(1)

– Optional Boot Code Section with Independent Lock Bits

In-System Programming by On-chip Boot Program

True Read-While-Write Operation

All supplied parts are preprogramed with a default USB bootloader

– Programming Lock for Software Security • JTAG (IEEE std. 1149.1 compliant) Interface

– Boundary-scan Capabilities According to the JTAG Standard

– Extensive On-chip Debug Support

– Programming of Flash, EEPROM, Fuses, and Lock Bits through the JTAG Interface

• USB 2.0 Full-speed/Low Speed Device Module with Interrupt on Transfer Completion

– Complies fully with Universal Serial Bus Specification Rev 2.0

– Supports data transfer rates up to 12 Mbit/s and 1.5 Mbit/s

– Endpoint 0 for Control Transfers: up to 64-bytes

– 6 Programmable Endpoints with IN or Out Directions and with Bulk, Interrupt or Isochronous Transfers

– Configurable Endpoints size up to 256 bytes in double bank mode

– Fully independent 832 bytes USB DPRAM for endpoint memory allocation

– Suspend/Resume Interrupts

– 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

• Peripheral Features

– On-chip PLL for USB and High Speed Timer: 32 up to 96 MHz operation

– One 8-bit Timer/Counter with Separate Prescaler and Compare Mode

– Two 16-bit Timer/Counter with Separate Prescaler, Compare- and Capture Mode

– One 10-bit High-Speed Timer/Counter with PLL (64 MHz) and Compare Mode

– Four 8-bit PWM Channels

– Four PWM Channels with Programmable Resolution from 2 to 16 Bits

– Six PWM Channels for High Speed Operation, with Programmable Resolution from 2 to 11 Bits

– Output Compare Modulator

– 12-channels, 10-bit ADC (features Differential Channels with Programmable Gain)

– Programmable Serial USART with Hardware Flow Control

– Master/Slave SPI Serial Interface