WM8351 datasheet(230/330 Pages) WOLFSON

230 / 330 page

WM8351

Production Data

PD, April 2012, Rev 4.5

230

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

REFER TO

R21 (15h)

Alarm

Hours/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.

Alarm Hours/Day

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

REFER TO

R22 (16h)

Alarm

Date/Month

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.

Alarm Date/Month

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

WM8351 Datasheet(PDF) 230 Page - Wolfson Microelectronics plc

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