UVSCOM_INTR_DT_RD
[UVSCOM_INTR_DT_RD] = {
usbd_transfer_start(sc->sc_xfer[UVSCOM_INTR_DT_RD]);
if (sc->sc_xfer[UVSCOM_INTR_DT_RD])
usbd_transfer_stop(sc->sc_xfer[UVSCOM_INTR_DT_RD]);