WM8352 datasheet(191/336 Pages) WOLFSON

191 / 336 page

Production Data

WM8352

PD, February 2011, Rev 4.4

191

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R20 (14h)

ALARM

sec / min

14:8

RTC_ALMMINS

[6:0]

000_0000

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.

6:0

RTC_ALMSECS

[6:0]

000_0000

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.

R21 (15h)

ALARM

hour / day

11:8

RTC_ALMDAY

[3:0]

0000

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.

RTC_ALMHPM

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.

4:0

RTC_ALMHRS

[4:0]

0_0000

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.

R22 (16h)

ALARM

date

12:8

RTC_ALMMTH

[4:0]

0_0000

Month alarm register with range 1-12. 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.

5:0

RTC_ALMDATE

[5:0]

00_0000

Date alarm register with range 1-31. 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.

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:



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.

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