wm8351 Wolfson Microelectronics plc, wm8351 Datasheet - Page 191

• Manufacturer Part Number: wm8351
• Description: Wolfson Audioplus? Stereo Codec With Power Management
• Manufacturer: Wolfson Microelectronics plc

Production Data
w
R20 (14h)
ALARM
sec / min
R21 (15h)
ALARM
hour / day
R22 (16h)
ALARM
date
Table 132 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
6:0
4:0
5:0
BIT
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, June 2009, Rev 4.1
WM8351
191