WM8352 datasheet(231/336 Pages) WOLFSON

231 / 336 page

Production Data

WM8352

PD, February 2011, Rev 4.4

231

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

REFER TO

R23 (17h)

RTC Time

Control

RTC_BCD

RTC Coding (applies to all time registers)

0 = Binary

1 = BCD

RTC_12HR

RTC 12/24 hours mode

1 = 12 hours (MSB of RTC_HRS indicates AM/PM)

0 = 24 hours (MSB of RTC_HRS is 0)

RTC_SET

Stops RTC seconds counter (instruction only)

0 = normal operation

1 = stop counter

RTC_STS

Status of RTC seconds counter

0 = normal operation

1 = counter stopped

RTC_ALMSET

Stops alarms (instruction only)

0 = normal operation

1 = stop alarms

It is recommended to stop alarms when setting the

RTC alarm. This avoids false alarms.

RTC_ALMSTS

Actual status of ALARM circuitry

0 = normal operation

1 = alarms stopped

6:4

RTC_PINT[2:0]

010

Selects frequency of periodic interrupt output pulse

(32kHz period duration) as shown below. When set

time status is high, the periodic output is disabled.

000 = disabled

001 = 1 sec

010 = 1 min

011 = 1 hour

100 = 1 day

101 = 1 month

11x = disabled

3:0

RTC_DSW[3:0]

0000

Divided Square wave select.

0000 = disabled

0001 = 1Hz

0010 = 2Hz

…

1011 = 1024Hz

1100 = 2048Hz

1101 = 4096Hz

1110 = 8192Hz

1111 = 16384Hz

Note: due to trim settings for crystal intolerances a

single square wave period during seconds rollover

may be decrease its on time period or increase its off

time period by up to 8 32kHz periods.

WM8352 Datasheet(PDF) 231 Page - Wolfson Microelectronics plc

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