SAB_ISR1_ALLS
sc->sc_imr1 &= ~(SAB_ISR1_XPR | SAB_ISR1_ALLS);
if (isr1 & (SAB_ISR1_XPR | SAB_ISR1_ALLS)) {
isr1 &= ~SAB_ISR1_ALLS;
if ((isr1 & SAB_ISR1_ALLS) && ((sc->sc_txc == 0) ||