wm8941 Wolfson Microelectronics plc, wm8941 Datasheet - Page 62
wm8941
Manufacturer Part Number
wm8941
Description
Mono Codec With Speaker Driver And Video Buffer
Manufacturer
Wolfson Microelectronics plc
Datasheet
1.WM8941.pdf
(94 pages)
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WM8941
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MASTER CLOCK AND PHASE LOCKED LOOP (PLL)
Table 46 Sample Rate Control
The PLL is enabled or disabled by the PLLEN register bit.
Note : In order to minimise current consumption, the PLL is disabled when the VMIDSEL[1:0] bits are
set to 00b. VMIDSEL[1:0] must be set to a value other than 00b to enable the PLL.
Table 47 PLLEN Control Bit
The WM8941 has an on-chip phase-locked loop (PLL) circuit that can be used to:
Table 47 shows the PLL and internal clocking arrangement on the WM8941.
R7
Additional
control
R1
Power
Management 1
REGISTER
ADDRESS
•
•
REGISTER
ADDRESS
Generate master clocks for the WM8940 audio functions from another external clock, e.g.
in telecoms applications.
Generate an output clock, on GPIO, for another part of the system (derived from an
existing audio master clock).
3:1
BIT
5
BIT
SR
LABEL
PLLEN
LABEL
000
0
DEFAULT
DEFAULT
PLL enable
0=PLL off
1=PLL on
Approximate sample rate (configures the
coefficients for the internal digital filters):
000=48kHz
001=32kHz
010=24kHz
011=16kHz
100=12kHz
101=8kHz
110-111=reserved
DESCRIPTION
DESCRIPTION
PD, Rev 4.0, August 2008
Production Data
62
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