USBF_EP0_STG_START_INT
USBF_EP0_OUT_NULL_INT | USBF_EP0_STG_START_INT |
if (!(sts & USBF_EP0_STG_START_INT))
sts &= ~USBF_EP0_STG_START_INT;
if (!(sts & USBF_EP0_STG_START_INT))
sts &= ~USBF_EP0_STG_START_INT;