RTW_INTR_BEACON
if ((isr & RTW_INTR_BEACON) != 0)
rtw_intr_beacon(sc, isr & RTW_INTR_BEACON);
sc->sc_inten = RTW_INTR_RX|RTW_INTR_TX|RTW_INTR_BEACON|RTW_INTR_ATIMINT;