WM8903 datasheet(120/178 Pages) WOLFSON

120 / 178 page

WM8903

Production Data

PD, Rev 4.5, June 2012

120

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 0

4:0

WSEQ_WRIT

E_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 1

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.

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).

11:8

WSEQ_DELA

Y [3:0]

0000

Time delay after executing this step.

Total time per step (including execution)

= 62.5µs × (2

WSEQ_DELAY + 8)

WM8903 Datasheet(PDF) 120 Page - Wolfson Microelectronics plc

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