The XMEGA A1U Xplained Pro has a micro USB receptacle for use with the XMEGA A1U USB device module. To be able to detect when a USB cable is connected, a GPIO is used to detect the VBUS voltage on the connector.
| Pin on XMEGA | USB |
|---|---|
| PA2 | VBUS Detection |
| PD6 | USB D- |
| PD7 | USB D+ |