wm8961 Wolfson Microelectronics plc, wm8961 Datasheet - Page 21

• Manufacturer Part Number: wm8961
• Description: Ultra-low Power Stereo Codec With 1w Stereo Class D Speaker Drivers And Ground Referenced Headphone Drivers
• Manufacturer: Wolfson Microelectronics plc

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WM8961
S
Figure 8 2-Wire Serial Control Interface (single write)
Figure 9 2-Wire Serial Control Interface (single read)
Figure 10 2-Wire Serial Control Interface (multiple write using auto-increment)
Figure 11 2-Wire Serial Control Interface (multiple read using auto-increment)
Device ID
RW
(0)
A
A Write Sequencer allows register write sequences to be stored in an area of memory on the WM8961
and then triggered by another register write. This allows complex sequences of updates to the
WM8961 registers without the constant intervention of the processor. To use the write sequencer, an
MCLK must be present and CLK_SYS_ENA=1. Refer to section headed “Control Write Sequencer”
for operation of the Write Sequencer.
ALERT RESPONSES
By default WM8961 does not respond to Control interface alert response messages. This can be
enabled by setting the ARA_ENA bit as detailed in Table 3.
Table 3 Control Interface Settings
Index
R252 (FCh)
General test 1
REGISTER
ADDRESS
A
Sr
1
0
BIT
Device ID
ARA_ENA
AUTO_INC
LABEL
(1)
RW
A
MSByte Data
0
1
DEFAULT
A
0 : off
1 : on
Enable Auto-Increment
0 : off
1 : on
Alert Response Address Enable
LSByte Data
DESCRIPTION
PP, August 2009, Rev 3.1
A
P
Pre-Production
21