AACI_READ
while ((AACI_READ(sc, AACISR) & AACISR_TXHE) != 0) {
if (AACI_READ(sc, AACISL1RX) != (reg << 12))
*val = AACI_READ(sc, AACISL2RX) >> 4;
isr = AACI_READ(sc, AACIISR);