Datasheet

19.8.26 Alarm 0 Value - MODE2
Name: ALARM0
Offset: 0x18
Reset: 0x00000000
Property: Write-Protected, Write-Synchronized
The 32-bit value of ALARM0 is continuously compared with the 32-bit CLOCK value, based on the
masking set by MASKn.SEL. When a match occurs, the Alarm 0 interrupt flag in the Interrupt Flag Status
and Clear register (INTFLAG.ALARMn) is set on the next counter cycle, and the counter is cleared if
CTRL.MATCHCLR is one.
Bit 31 30 29 28 27 26 25 24
YEAR[5:0] MONTH[3:2]
Access
R/W R/W R/W R/W R/W R/W R/W R/W
Reset 0 0 0 0 0 0 0 0
Bit 23 22 21 20 19 18 17 16
MONTH[1:0] DAY[4:0] HOUR[4:4]
Access
R/W R/W R/W R/W R/W R/W R/W R/W
Reset 0 0 0 0 0 0 0 0
Bit 15 14 13 12 11 10 9 8
HOUR[3:0] MINUTE[5:2]
Access
R/W R/W R/W R/W R/W R/W R/W R/W
Reset 0 0 0 0 0 0 0 0
Bit 7 6 5 4 3 2 1 0
MINUTE[1:0] SECOND[5:0]
Access
R/W R/W R/W R/W R/W R/W R/W R/W
Reset 0 0 0 0 0 0 0 0
Bits 31:26 – YEAR[5:0] Year
The alarm year. Years are only matched if MASKn.SEL is 6.
Bits 25:22 – MONTH[3:0] Month
The alarm month. Months are matched only if MASKn.SEL is greater than 4.
Bits 21:17 – DAY[4:0] Day
The alarm day. Days are matched only if MASKn.SEL is greater than 3.
Bits 16:12 – HOUR[4:0] Hour
The alarm hour. Hours are matched only if MASKn.SEL is greater than 2.
Bits 11:6 – MINUTE[5:0] Minute
The alarm minute. Minutes are matched only if MASKn.SEL is greater than 1.
Bits 5:0 – SECOND[5:0] Second
The alarm second. Seconds are matched only if MASKn.SEL is greater than 0.
SAM D21 Family
RTC – Real-Time Counter
© 2018 Microchip Technology Inc.
Datasheet Complete
DS40001882D-page 298