RTC_ALRMASSR register
| SS | Sub seconds value This value is compared with the contents of the synchronous prescalers counter to determine if Alarm A is to be activated. Only bits 0 up MASKSS-1 are compared. |
| MASKSS | Mask the most-significant bits starting at this bit 0: No comparison on sub seconds for Alarm A. The alarm is set when the seconds unit is incremented (assuming that the rest of the fields match). 1: SS[14:1] are dont care in Alarm A comparison. Only SS[0] is compared. 2: SS[14:2] are dont care in Alarm A comparison. Only SS[1:0] are compared. 3: SS[14:3] are dont care in Alarm A comparison. Only SS[2:0] are compared. … 12: SS[14:12] are dont care in Alarm A comparison. SS[11:0] are compared. 13: SS[14:13] are dont care in Alarm A comparison. SS[12:0] are compared. 14: SS[14] is dont care in Alarm A comparison. SS[13:0] are compared. 15: All 15 SS bits are compared and must match to activate alarm. The overflow bits of the synchronous counter (bits 15) is never compared. This bit can be different from 0 only after a shift operation. |