wm8352 Wolfson Microelectronics plc, wm8352 Datasheet - Page 193

• Manufacturer Part Number: wm8352
• Description: Wolfson Audioplus? Stereo Codec With Power Management
• Manufacturer: Wolfson Microelectronics plc

Production Data
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The applicable register bits are defined in Table 134.
R12 (0Ch)
Power
Mgmt (5)
R218 (DAh)
RTC Tick
Control
Note: RTC_TICK_ENA can be accessed through R12 or through R218. Reading from or writing to
either register location has the same effect.
Table 134 Controlling the RTC Frequency Trim
ADDRESS
BIT
9:0
11
15
14
RTC_TICK_ENA
RTC_TICKSTS
RTC_TRIM [9:0]
LABEL
DEFAULT
00_0000_
0000
1
0
Enable RTC counting (instruction only)
0 = disabled
1 = enabled
Protected by security key.
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 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.
DESCRIPTION
PD, June 2009, Rev 4.1
WM8352
193