RM0453 Rev 1 1031/1461
RM0453 Real-time clock (RTC)
1057
32.6.14 RTC alarm A register (RTC_ALRMAR)
This register can be written only when ALRAE is reset in RTC_CR register, or in initialization
mode.
Address offset: 0x40
Backup domain reset value: 0x0000 0000
System reset: not affected
Bits 31:0 SS[31:0]: Sub second value/Synchronous binary counter values
SS[31:0] is the value of the synchronous prescaler counter when the timestamp event
occurred.
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16
MSK4
WDSE
L
DT[1:0] DU[3:0] MSK3 PM HT[1:0] HU[3:0]
rw rw rw rw rw rw rw rw rw rw rw rw rw rw rw rw
1514131211109876543210
MSK2 MNT[2:0] MNU[3:0] MSK1 ST[2:0] SU[3:0]
rw rw rw rw rw rw rw rw rw rw rw rw rw rw rw rw
Bit 31 MSK4: Alarm A date mask
0: Alarm A set if the date/day match
1: Date/day don’t care in alarm A comparison
Bit 30 WDSEL: Week day selection
0: DU[3:0] represents the date units
1: DU[3:0] represents the week day. DT[1:0] is don’t care.
Bits 29:28 DT[1:0]: Date tens in BCD format
Bits 27:24 DU[3:0]: Date units or day in BCD format
Bit 23 MSK3: Alarm A hours mask
0: Alarm A set if the hours match
1: Hours don’t care in alarm A comparison
Bit 22 PM: AM/PM notation
0: AM or 24-hour format
1: PM
Bits 21:20 HT[1:0]: Hour tens in BCD format
Bits 19:16 HU[3:0]: Hour units in BCD format
Bit 15 MSK2: Alarm A minutes mask
0: Alarm A set if the minutes match
1: Minutes don’t care in alarm A comparison
Bits 14:12 MNT[2:0]: Minute tens in BCD format
Bits 11:8 MNU[3:0]: Minute units in BCD format
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