Microchip® Advanced Software Framework

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Human interface on XMEGA-A3BU Xplained:

Led green (close to USB connector) is on at power on
Led 0 is on when USB line is in IDLE mode, and off in SUSPEND mode
Led 1 blinks when USB host has checked and enabled vendor interface
Red LED (Led 2) close to USB connector is on when loopback is running