X1241REG_DT
WRITERTC(sc, X1241REG_DT, bintobcd(ymdhms->dt_day));
ymdhms->dt_day = bcdtobin(READRTC(sc, X1241REG_DT));
WRITERTC(sc, X1241REG_DT, bintobcd(ymdhms->dt_day));
ymdhms->dt_day = bcdtobin(READRTC(sc, X1241REG_DT));