* - In host mode, it may be disabled at start-up, enabled on the firing of the \ref USB_DeviceAttached\r
* event and disabled again on the firing of the \ref USB_DeviceUnattached event.\r
*\r
* - In host mode, it may be disabled at start-up, enabled on the firing of the \ref USB_DeviceAttached\r
* event and disabled again on the firing of the \ref USB_DeviceUnattached event.\r
*\r