M41T81_SEC
ret = time_readrtc(sa->sa_interface, sa->sa_device, SMB_1BYTE_ADDR, M41T81_SEC);
WRITERTC(sc, M41T81_SEC, bintobcd(ymdhms->dt_sec));
ymdhms->dt_sec = bcdtobin(READRTC(sc, M41T81_SEC));
ret = time_readrtc(sa->sa_interface, sa->sa_device, SMB_1BYTE_ADDR, M41T81_SEC);
WRITERTC(sc, M41T81_SEC, bintobcd(ymdhms->dt_sec));
ymdhms->dt_sec = bcdtobin(READRTC(sc, M41T81_SEC));