WM8310 datasheet(127/291 Pages) WOLFSON

127 / 291 page

Pre-Production

WM8310

PP, May 2012, Rev 3.1

127

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R16416

(4020h)

RTC Write

Counter

15:0

RTC_WR_CNT

0000h

RTC Write Counter.

This random number is updated on every

write to the RTC_TIME registers.

R16417

(4021h)

RTC Time 1

15:0

RTC_TIME

[31:16]

0000h

RTC Seconds counter (MSW)

RTC_TIME increments by 1 every

second. This is the 16 MSBs.

R16418

(4022h)

RTC Time 2

15:0

RTC_TIME [15:0]

0000h

RTC Seconds counter (LSW)

RTC_TIME increments by 1 every

second. This is the 16 LSBs.

R16419

(4023h)

RTC Alarm 1

15:0

RTC_ALM [31:16]

0000h

RTC Alarm time (MSW)

16 MSBs of RTC_ALM

R16420

(4024h)

RTC Alarm 2

15:0

RTC_ALM [15:0]

0000h

RTC Alarm time (LSW)

16 LSBs of RTC_ALM

R16421

(4025h)

RTC Control

RTC_VALID

RTC Valid status

0 = RTC_TIME has not been set since

Power On Reset

1 = RTC_TIME has been written to since

Power On Reset

RTC_SYNC_BUS

RTC Busy status

0 = Normal

1 = Busy

The RTC registers should not be written

to when RTC_SYNC_BUSY = 1.

RTC_ALM_ENA

RTC Alarm Enable

0 = Disabled

1 = Enabled

R16422

(4026h)

RTC Trim

9:0

RTC_TRIM

000h

RTC frequency trim. Value is a 10bit

fixed point <4,6> 2’s complement

number. MSB Scaling = -8Hz.

The register indicates the error (in Hz)

with respect to the ideal 32768Hz) of the

input crystal frequency.

Protected by user key

Table 69 Real Time Clock (RTC) Control

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