WM8993 datasheet(142/229 Pages) WOLFSON

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WM8993

Production Data

PD, November 2010, Rev 4.0

142

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

ignored.

WSEQ_DELAY is a 4-bit field which controls the waiting time between the current step and the next

step in the sequence i.e. the delay occurs after the write in which it was called. The total delay time

per step (including execution) is given by:

T = k × (2 WSEQ_DELAY + 8)

where k = 62.5

μs (under recommended operating conditions)

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

μs 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

R70 (46h)

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 R71 and R72 will be copied.

0 to 31 = RAM addresses

R71 (47h)

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.

R72 (48h)

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)

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

Table 94 Write Sequencer Control - Programming a Sequence

WM8993 Datasheet(PDF) 142 Page - Wolfson Microelectronics plc

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