AT91_RTC_MONTH
tm->tm_mon = bcd2bin(FIELD_GET(AT91_RTC_MONTH, date)) - 1;
| FIELD_PREP(AT91_RTC_MONTH, bin2bcd(tm->tm_mon + 1))
FIELD_PREP(AT91_RTC_MONTH, bin2bcd(alrm->time.tm_mon + 1))