WM9713 datasheet(68/111 Pages) WOLFSON

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WM9713L

Preliminary Technical Data

PTD, March 2004, Rev 2.2

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

PNDN

Pen status (read-only)

0: Pen Up

1: Pen Down

14:12

ADCSRC

000

Touchpanel ADC Source

000: No measurement

001: X co-ordinate measurement

010: Y co-ordinate measurement

011: Pressure measurement (4-wire only)

100: COMP1/AUX1 measurement (pin 29)

101: COMP2/AUX2 measurement (pin 30)

110: BMON/AUX3 measurement (pin 31)

111: WIPER/AUX4 measurement (pin 12)

7Ah

AC-Link slot

selected by

SLT

11:0

ADCD

000h

Touchpanel ADC Data (read-only)

Bit 11 = MSB

Bit 0 = LSB

78h

WAIT

0: No effect (new ADC data overwrites

unread data in register 7Ah)

1: New data is held back, and

measurements delayed, until register 7Ah is

read)

Table 49 Touchpanel Digitiser Data

When operating in co-ordinate mode (COO=1) there will be 3 results to read back from each set of

measurements – namely X,Y and the third additional measurement. After the co-ordinate set has

finished the X result will be present in register 7Ah. Once this has been read back by the user the Y

result will overwrite register 7Ah, as indicated by ADCSRC. Finally, after the Y result has been read

back, the result of the third, additional, measurement will become present in 7Ah, again indicated by

ADCSRC.

To avoid losing data that has not yet been read, the WM9713L can delay overwriting register 7Ah

with new conversions until the old data has been read. This function is enabled using the WAIT bit,

and applies to both single and co-ordinate conversion mode.

The flow diagram in Figure 24 shows the timing of touchpanel conversions, and data readback from

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