The SAM4E Xplained Pro has a Micro-USB receptable for use with the SAM4E USB device module labeled "target usb" on the board. To be able to detect when a USB cable is connected, a GPIO (PE2) is used to detect the VBUS voltage on the connector.
Table 1 lists all I/O-lines connected to the USB connector.
| SAM4E pin | Function | USB function | Shared functionality |
|---|---|---|---|
| PE2 | GPIO | VBUS detection | EXT2 GPIO |
| PB10 | DFSD_N | USB D- | |
| PB11 | DFSD_P | USB D+ |