WM8904ECSSLASHR datasheet(127/188 Pages) WOLFSON

127 / 188 page

Pre-Production

WM8904

PP, Rev 3.3, September 2012

127

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.

WSEQ_ADDR is an 8-bit field containing the Control Register Address in which the data should be

written.

WSEQ_DATA_START is a 4-bit field which identifies the LSB position within the selected Control

data to be written to bit 4. With this setting, 4-bit data would be written to bits 7:4 and so on.

WSEQ_DATA_WIDTH is a 3-bit field which identifies the width of the data block to be written. This

enables selected portions of a Control Register to be updated without any concern for other bits within

the same register, eliminating the need for read-modify-write procedures. Values of 0 to 7 correspond

to data widths of 1 to 8 respectively. For example, setting WSEQ_DATA_WIDTH = 010 will cause a

3-bit data block to be written. Note that the maximum value of this field corresponds to an 8-bit data

block; writing to register fields greater than 8 bits wide must be performed using two separate

operations of the Control Write Sequencer.

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

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 = 62.5

s (under recommended operating conditions)

This gives a useful range of execution/delay times from 562

s 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.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R108 (6Ch)

Write

Sequencer

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

Sequencer

14:12

WSEQ_DATA_

WIDTH [2:0]

000

Width of the data block written in this

sequence step.

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

WSEQ_ADDR

[7:0]

0000_0000

Control Register Address to be written

to in this sequence step.

WM8904ECS/R 数据表(PDF) 127 Page - Wolfson Microelectronics plc

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