WM8904ECSSLASHR datasheet(168/188 Pages) WOLFSON

168 / 188 page

WM8904

Pre-Production

PP, Rev 3.3, September 2012

168

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

REFER TO

R110 (6Eh)

Write

Sequencer 2

WSEQ_EOS

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).

Control Write

Sequencer

11:8

WSEQ_DELAY

[3:0]

0000

Time delay after executing this step.

Total delay time per step (including execution)=

62.5µs × (2^WSEQ_DELAY + 8)

Control Write

Sequencer

7:0

WSEQ_DATA

[7:0]

0000_0000 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.

Control Write

Sequencer

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

REFER TO

R111 (6Fh)

Write

Sequencer 3

WSEQ_ABORT

Writing a 1 to this bit aborts the current sequence and

returns control of the device back to the serial control

interface.

Control Write

Sequencer

WSEQ_START

Writing a 1 to this bit starts the write sequencer at the

memory location indicated by the

WSEQ_START_INDEX field. The sequence

continues until it reaches an “End of sequence” flag.

At the end of the sequence, this bit will be reset by

the Write Sequencer.

Control Write

Sequencer

5:0

WSEQ_START_

INDEX [5:0]

00_0000

Sequence Start Index. This is the memory location of

the first command in the selected sequence.

0 to 31 = RAM addresses

32 to 48 = ROM addresses

49 to 63 = Reserved

Control Write

Sequencer

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

REFER TO

R112 (70h)

Write

Sequencer 4

9:4

WSEQ_CURRE

NT_INDEX [5:0]

00_0000

Sequence Current Index (read only):

This is the location of the most recently accessed

command in the write sequencer memory.

Control Write

Sequencer

WSEQ_BUSY

Sequencer Busy flag (read only):

0 = Sequencer idle

1 = Sequencer busy

Note: it is not possible to write to control registers via

the control interface while the Sequencer is Busy.

Control Write

Sequencer

WM8904ECS/R Datenblatt(PDF) 168 Page - Wolfson Microelectronics plc

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