wm9090 Wolfson Microelectronics plc, wm9090 Datasheet - Page 31

• Manufacturer Part Number: wm9090
• Description: Ultra Low Power Audio Subsystem
• Manufacturer: Wolfson Microelectronics plc

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Pre-Production
OSC_ENA
Oscillator
Internal
Figure 7 Clocking Scheme
Table 16 Clocking Control
Table 17 TOCLK Rates
R1 (01h)
Power
Management
(1)
R6 (06h)
Clocking 1
R66 (42h)
Clocking 4
TOCLK_RATE
REGISTER
ADDRESS
CLK_SYS
1
0
1
0
1
0
1
0
BIT
15
14
f/N
3
8
7
TOCLK_RATE_X4 TOCLK_RATE_DIV16
OSC_ENA
TOCLK_RATE
TOCLK_ENA
TOCLK_RATE_DIV16
TOCLK_RATE_X4
1
1
0
0
1
1
0
0
TOCLK_ENA
LABEL
f/N
f/N
TOCLK_RATE_DIV16
0 = f / 1
1 = f / 16
f/1024
f/N
DEFAULT
TOCLK_RATE_X4
0 = f x 1
1 = f x 4
0
0
0
0
1
1
1
1
0
0
0
0
0
f.N
CLK_SYS Oscillator Enable
0 = Disabled
1 = Enabled
TOCLK Rate Divider (/2)
0 = f / 2
1 = f / 1
TOCLK Enable
0 = Disabled
1 = Enabled
TOCLK Rate Divider (/16)
0 = f / 1
1 = f / 16
TOCLK Rate Multiplier
0 = f x 1
1 = f x 4
TOCLK_RATE
0 = f / 2
1 = f / 1
f/N
FREQ (Hz)
15.625
7.8125
31.25
1000
62.5
500
250
125
Volume update timeout
DC Servo clock
Class D switching clock
256kHz clock to
Charge Pump, Control
Write Sequencer and
other circuits
PP, January 2010, Rev 3.0
DESCRIPTION
TOCLK
PERIOD (ms)
128
64
16
32
WM9090
1
2
4
8
31