S35390A_ALRM_BYTE_MINS
buf[S35390A_ALRM_BYTE_MINS] = bin2bcd(alm->time.tm_min) | 0x80;
if (buf[S35390A_ALRM_BYTE_MINS] & 0x80)
alm->time.tm_min = bcd2bin(buf[S35390A_ALRM_BYTE_MINS] & ~0x80);