wm8351 Wolfson Microelectronics plc, wm8351 Datasheet - Page 307

• Manufacturer Part Number: wm8351
• Description: Wolfson Audioplus? Stereo Codec With Power Management
• Manufacturer: Wolfson Microelectronics plc

Production Data
Register D8h Main Bandgap Control
Register D9h OSC Control
w
REGISTER
REGISTER
REGISTER
ADDRESS
ADDRESS
OSC Control
ADDRESS
R218 (DAh)
R216 (D8h)
R217 (D9h)
RTC Tick
Bandgap
Control
Control
Main
BIT
BIT
BIT
9:0
15
15
15
14
13
12
MBG_LOAD_FUSES
OSC_LOAD_FUSES
RTC_TICK_ENA
RTC_TRIM[9:0]
RTC_TICKSTS
RTC_CLKSRC
OSC32K_ENA
LABEL
LABEL
LABEL
00_0000_0000 RTC frequency trim. Used to adjust the count
DEFAULT
DEFAULT
DEFAULT
0
1
0
1
0
0
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
Enables the current to the bandgap trim fuses.
This must be set to 1 when writing the fuses. To
read the trim value, this bit must be set and then
reset.
Protected by security key.
Enables the current to the bandgap trim fuses.
This must be set to 1 when writing the fuses. To
read the trim value held in the fuse, this bit must
be set and then reset.
DESCRIPTION
DESCRIPTION
DESCRIPTION
PD, June 2009, Rev 4.1
REFER TO
REFER TO
REFER TO
WM8351
307