wm8350 Wolfson Microelectronics plc, wm8350 Datasheet - Page 318

• Manufacturer Part Number: wm8350
• Description: Wolfson Audioplus? Stereo Codec With Power Management
• Manufacturer: Wolfson Microelectronics plc

REGISTER
WM8350
Register DAh RTC Tick Control
Register DBh Security1
w
REGISTER
ADDRESS
ADDRESS
R219 (DBh)
R218 (DAh)
Security1
RTC Tick
Control
BIT
15:0
BIT
9:0
15
14
13
12
SECURITY[15:0] 0000_0000_0000_0000 The value 0013h needs to be set in this
RTC_TICK_ENA
RTC_TRIM[9:0]
RTC_TICKSTS
RTC_CLKSRC
OSC32K_ENA
LABEL
LABEL
00_0000_0000 RTC frequency trim. Used to adjust the count
DEFAULT
DEFAULT
0
1
1
1
1
0
0
0
0
1
1
1
1
Enable RTC counting (instruction only)
0 = disabled
1 = enabled
Protected by security key. Reset by state machine.
Default held in metal mask.
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
1 = take 32Khz from GPIOx (Alternative GPIO
function)
Protected by security key. Reset by state machine.
Default held in metal mask.
On chip 32Khz OSC enable
0 = disable
1 = enable
Protected by security key. Reset by state machine.
Default held in metal mask.
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 to allow write access to the security
locked registers.
Reset by state machine.
DESCRIPTION
DESCRIPTION
PD, June 2009, Rev 4.1
REFER TO
REFER TO
Production Data
318