WM8352 datasheet(313/336 Pages) WOLFSON

313 / 336 page

Production Data

WM8352

PD, February 2011, Rev 4.4

313

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

REFER TO

R218 (DAh)

RTC Tick

Control

RTC_TICK_ENA

Enable RTC counting (instruction only)

0 = disabled

1 = enabled

Protected by security key. Reset by state machine.

Default held in metal mask.

RTC_TICKSTS

Status of tick request. This bit can be used to

ensure the RTC is using the value of

RTC_TICK_ENA.

0 = disabled

1 = enabled

Protected by security key.

RTC_CLKSRC

RTC 32Khz clock source.

0 = take 32Khz from 32K OSC

1 = take 32Khz from GPIOx (Alternative GPIO

function)

Protected by security key. Reset by state machine.

Default held in metal mask.

OSC32K_ENA

On chip 32Khz OSC enable

0 = disable

1 = enable

Protected by security key. Reset by state machine.

Default held in metal mask.

9:0

RTC_TRIM[9:0] 00_0000_0000 RTC frequency trim. Used to adjust the count

value of the Tick Gen block to compensate for

crystal inaccuracies. RTC frequency trim 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. e.g.:

Actual crystal freq: 32769.00Hz: Required trim

0xb0001_000000 (+1.000000)

Actual crystal freq: 32767.00Hz: Required trim

0xb1111_000000 (-1.000000)

Actual crystal freq: 32775.58Hz: Required trim

0xb0111_100101 (+7.578125)

Actual crystal freq: 32763.78Hz: Required trim

0xb1011_110010 (-4.218750)

Protected by security key.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

REFER TO

R219 (DBh)

Security1

15:0

SECURITY[15:0] 0000_0000_0000_0000 The value 0013h needs to be set in this

locked registers.

Reset by state machine.

WM8352 Datasheet(PDF) 313 Page - Wolfson Microelectronics plc

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