Features

– Based on the USB DFU class

– Autobaud (8/16 MHz crystal)

– Read/Write Flash and EEPROM on-chip memories

– Read Device ID

– Full chip Erase

– Start application command

– Software Entry-points for on-chip flash drivers

1.

Description

The 8bits mega AVR with USB interface devices are factory configured with a

USB bootloader located in the on-chip flash boot section of the controller.

This USB bootloader allows to perform In-System Programming from an USB

host controller without removing the part from the system or without a

pre-programmed application, and without any external programming interface.

This document describes the USB bootloader functionalities as well as the serial

protocol to efficiently perform operations on the on chip Flash memories (Flash

and EEPROM).

7618C–AVR–07/08

USB DFU

Bootloader

Datasheet

AT90USB128x

AT90USB64x

AT90USB162

AT90USB82

ATmega32U4

ATmega16U4