Production Data
WM8352
REGISTER
ADDRESS
BIT
LABEL
DEFAULT
DESCRIPTION
REFER TO
R218 (DAh)
RTC Tick
Control
15
RTC_TICK_ENA
1
Enable RTC counting (instruction only)
0 = disabled
1 = enabled
Protected by security key. Reset by state machine.
Default held in metal mask.
14
RTC_TICKSTS
RTC_CLKSRC
OSC32K_ENA
0
0
1
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 32Khz clock source.
0 = take 32Khz from 32K OSC
13
1 = take 32Khz from GPIOx (Alternative GPIO
function)
Protected by security key. Reset by state machine.
Default held in metal mask.
12
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.
Register DAh RTC Tick Control
REGISTER
ADDRESS
BIT
LABEL
DEFAULT
DESCRIPTION
REFER TO
R219 (DBh) 15:0 SECURITY[15:0] 0000_0000_0000_0000 The value 0013h needs to be set in this
Security1
register to allow write access to the security
locked registers.
Reset by state machine.
Register DBh Security1
PD, February 2011, Rev 4.4
313
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WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
