wm8903 Wolfson Microelectronics plc, wm8903 Datasheet - Page 104

• Manufacturer Part Number: wm8903
• Description: Ultra Low Power Codec For Portable Audio Applications
• Manufacturer: Wolfson Microelectronics plc

WM8903
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Figure 60 Control Write Sequencer Example
DEFAULT SEQUENCES
When the WM8903 is powered up, two Control Write Sequences are available through
ROM/default settings. The purpose of these sequences, and the register write required to
initiate them is summarised in Table 71. In both cases a single register write will initiate the
sequence.
Table 71 Write Sequencer Default Sequences
Note on Shut-Down sequence: The instruction at Index Address 32 (20h) shorts the outputs
LINEOUTL and LINEOUTR. If the Line outputs are not in use at the time the sequence is run, then
the sequence could, instead, be started at Index Address 33.
Index addresses 0 to 31 may be programmed to users’ own settings at any time, as described in
“Programming a Sequence” Users’ own settings remain in memory and are not affected by software
resets (i.e. writing to Register R0). However, any non-default sequences are lost when the device is
powered down.
The full definition of the ROM/default sequencer configuration is detailed in Table 72.
WSEQ START
ADDRESS
32
0
WSEQ FINISH
ADDRESS
29
48
Shut-Down sequence
Start-Up sequence
PURPOSE
PP, Rev 3.1, August 2009
Register R111 (6Fh)
Register R111 (6Fh)
Write 0100h to
Write 0120h to
TO INITIATE
Pre-Production
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