Datasheet

21.12.11 Alarm n Value in Clock/Calendar mode (CTRLA.MODE=2)
Name: ALARM
Offset: 0x20 + n*0x08 [n=0..1]
Reset: 0x00000000
Property: PAC Write-Protection, Write-Synchronized
The 32-bit value of ALARMn is continuously compared with the 32-bit CLOCK value, based on the
masking set by MASKn.SEL. When a match occurs, the Alarm n 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
CTRLA.MATCHCLR is '1'.
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 D5x/E5x Family Data Sheet
RTC – Real-Time Counter
© 2019 Microchip Technology Inc.
Datasheet
DS60001507E-page 366