Production Data
WM9090
w
PD, November 2010, Rev 4.1
33
OSC_ENA
CLK_SYS
f/N
DC Servo clock
f/N
Class D switching clock
f/N
256kHz clock to
Charge Pump, Control
Write Sequencer and
other circuits
f.N
TOCLK_ENA
Volume update timeout
f/N
f/1024
TOCLK_RATE_X4
0 = f x 1
1 = f x 4
TOCLK_RATE
0 = f / 2
1 = f / 1
Internal
Oscillator
f/N
TOCLK_RATE_DIV16
0 = f / 1
1 = f / 16
Figure 6 Clocking Scheme
REGISTER
ADDRESS
BIT LABEL
DEFAULT
DESCRIPTION
R1 (01h)
Power
Management
(1)
3
OSC_ENA
0
CLK_SYS Oscillator Enable
0 = Disabled
1 = Enabled
R6 (06h)
Clocking 1
15
TOCLK_RATE
0
TOCLK Rate Divider (/2)
0 = f / 2
1 = f / 1
14
TOCLK_ENA
0
TOCLK Enable
0 = Disabled
1 = Enabled
R66 (42h)
Clocking 4
8
TOCLK_RATE_DIV16
0
TOCLK Rate Divider (/16)
0 = f / 1
1 = f / 16
7
TOCLK_RATE_X4
0
TOCLK Rate Multiplier
0 = f x 1
1 = f x 4
Table 16 Clocking Control
TOCLK_RATE TOCLK_RATE_X4
TOCLK_RATE_DIV16
TOCLK
FREQ (Hz) PERIOD (ms)
1 1 0
1000
1
0 1 0
500
2
1 0 0
250
4
0 0 0
125
8
1 1 1
62.5
16
0 1 1
31.25
32
1 0 1
15.625
64
0 0 1
7.8125
128
Table 17 TOCLK Rates
