WM8351CGEB/RV WOLFSON [Wolfson Microelectronics plc], WM8351CGEB/RV Datasheet - Page 191
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WM8351CGEB/RV
Manufacturer Part Number
WM8351CGEB/RV
Description
Manufacturer
WOLFSON [Wolfson Microelectronics plc]
Datasheet
1.WM8351CGEBRV.pdf
(330 pages)
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Production Data
w
R20 (14h)
ALARM
sec / min
R21 (15h)
ALARM
hour / day
R22 (16h)
ALARM
date
Table 133 RTC Alarm Registers
The “don’t care” option (all bits set to 1) provides extra flexibility for programming ALARM duration
and recurrent alarms. For example:
ADDRESS
Setting only RTC_ALMSEC to “don’t care” produces an alarm lasting 1 minute.
Setting only RTC_ALMDATE to “don’t care” produces an alarm lasting 1 second that recurs
once a week, on the day determined by RTC_ALMDAY, during the month determined by
RTC_ALMMTH.
Setting RTC_ALMSEC, RTC_ALMDATE, RTC_ALMDAY and RTC_ALMMTH to “don’t
care” produces a daily alarm lasting 1 minute.
14:8
11:8
12:8
BIT
6:0
4:0
5:0
5
RTC_ALMMINS
[6:0]
RTC_ALMSECS
[6:0]
RTC_ALMDAY
[3:0]
RTC_ALMHPM
RTC_ALMHRS
[4:0]
RTC_ALMMTH
[4:0]
RTC_ALMDATE
[5:0]
LABEL
000_0000
000_0000
DEFAULT
00_0000
0_0000
0_0000
0000
0
Minutes alarm register with range 0-59. All
1's sets to 'don't care' state.
Note, during programming it is best to
disable the Alarm Enable request bit to
avoid false alarms.
Seconds alarm register with range 0-59. All
1's set to 'don't care' state.
Note, during programming it is best to
disable the Alarm Enable request bit to
avoid false alarms.
Day alarm register, with range 1-7, 1 =
Sunday. All 1's sets to 'don't care' state.
Note, during programming it is best to
disable the Alarm Enable request bit to
avoid false alarms.
Alarm hours AM/PM flag
0 = AM
1 = PM
Only applicable in 12 hour mode. In 24
hour mode set to 1 if RTC_ALMHRS is set
to all 1’s ‘don’t care’ or 0 otherwise.
Hours alarm register with range 0-23 in 24
hours mode and 1-12 in 12 hour. In 12 hour
mode bit 5 is used as PM/not-AM flag. All
1's sets to 'don't care' state.
Note, during programming it is best to
disable the Alarm Enable request bit to
avoid false alarms.
Month alarm register with range 1-12. All 1's
sets to 'don't care' state.
Date alarm register with range 1-31. All 1's
sets to 'don't care' state.
DESCRIPTION
PD, April 2012, Rev 4.5
WM8351
191
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