WM8903 datasheet(119/178 Pages) WOLFSON

119 / 178 page

Production Data

WM8903

PD, Rev 4.5, June 2012

119

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R108 (6Ch)

Write

Sequencer 0

WSMD_CLK_EN

Write Sequencer / Mic Detect Clock

Enable.

0 = Disabled

1 = Enabled

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.

(Write-Only Register)

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.

(Write-Only Register)

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

R112 (70h)

Write

Sequencer 4

9:4

WSEQ_CURRE

NT_INDEX [5:0]

00_0000

Sequence Current Index. This is the

location of the most recently

accessed command in the write

sequencer memory.

(Read-Only Register)

WSEQ_BUSY

Sequencer Busy flag

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.

(Read-Only Register)

Table 76 Write Sequencer Control – Initiating a Sequence

PROGRAMMING A SEQUENCE

A sequence consists of write operations to data bits (or groups of bits) within the control registers.

The Register fields associated with programming the Control Write Sequencer are described in Table

77.

For each step of the sequence being programmed, the Sequencer Index must be written to the

WSEQ_WRITE_INDEX field. The values 0 to 31 correspond to all the available RAM addresses

within the Write Sequencer memory. (Note that memory addresses 32 to 48 also exist, but these are

ROM addresses, which are not programmable.)

Having set the Index as described above, Register R109 must be written to (containing the Control

Also, Register R110 must be written to (containing the Register Data, the End of Sequence flag and

the Delay time required after this step is executed). After writing to these two registers, the next step

in the sequence may be programmed by updating WSEQ_WRITE_INDEX and repeating the

procedure.

WM8903 Datasheet(PDF) 119 Page - Wolfson Microelectronics plc

WM8903 Datasheet(HTML) 119 Page - Wolfson Microelectronics plc

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL