ATMEGA32U4 User Reference Manual Guide

●The ATMEDA32U4-AU is factory configured with a USB boot loader located in the on chip flash boot section of the controller. This USB boot loader allows to perform in system programming from a USB host controller without removing the part from the system or without a pre-programmed application, and without any external programming interface.

● Auto baud (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