Production Data
WM8912
WSEQ_DATA is an 8-bit field which contains the data to be written to the selected Control Register.
The WSEQ_DATA_WIDTH field determines how many of these bits are written to the selected
register; the most significant bits (above the number indicated by WSEQ_DATA_WIDTH) are
ignored.
WSEQ_DELAY is a 4-bit field which controls the waiting time between the current step and the next
step in the sequence. The total delay time per step (including execution) is given by:
T = k × (2 WSEQ_DELAY + 8)
where k = 62.5μs (under recommended operating conditions)
This gives a useful range of execution/delay times from 562μs up to 2.048s per step.
WSEQ_EOS is a 1-bit field which indicates the End of Sequence. If this bit is set, then the Control
Write Sequencer will automatically stop after this step has been executed.
REGISTER
ADDRESS
BIT
LABEL
DEFAULT
DESCRIPTION
R108 (6Ch)
Write
Sequencer
0
4:0
WSEQ_WRITE_
INDEX [4:0]
0_0000
Sequence Write Index. This is the
memory location to which any updates
to R109 and R110 will be copied.
0 to 31 = RAM addresses
R109 (6Dh)
Write
14:12
WSEQ_DATA_
WIDTH [2:0]
000
Width of the data block written in this
sequence step.
Sequencer
1
000 = 1 bit
001 = 2 bits
010 = 3 bits
011 = 4 bits
100 = 5 bits
101 = 6 bits
110 = 7 bits
111 = 8 bits
11:8
WSEQ_DATA_
START [3:0]
0000
Bit position of the LSB of the data
block written in this sequence step.
0000 = Bit 0
…
1111 = Bit 15
7:0
14
WSEQ_ADDR
[7:0]
0000_000
0
Control Register Address to be written
to in this sequence step.
R110 (6Eh)
Write
Sequencer
2
WSEQ_EOS
0
End of Sequence flag. This bit
indicates whether the Control Write
Sequencer should stop after executing
this step.
0 = Not end of sequence
1 = End of sequence (Stop the
sequencer after this step).
11:8
7:0
WSEQ_DELAY
[3:0]
0000
Time delay after executing this step.
Total delay time per step (including
execution)=
62.5μs × (2^WSEQ_DELAY + 8)
WSEQ_DATA
[7:0]
0000_000
0
Data to be written in this sequence
step. When the data width is less than
8 bits, then one or more of the MSBs
of WSEQ_DATA are ignored. It is
recommended that unused bits be set
to 0.
Table 57 Write Sequencer Control - Programming a Sequence
PD, Rev 4.0, September 2010
85
w
WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
