WM9713L_06 WOLFSON [Wolfson Microelectronics plc], WM9713L_06 Datasheet - Page 64

• Manufacturer Part Number: WM9713L_06
• Description: AC 97 Audio + Touchpanel CODEC
• Manufacturer: WOLFSON [Wolfson Microelectronics plc]

WM9713L
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MEASUREMENT TYPES
The ADCSEL control bits determine which type of measurement is performed (see below).
Table 49 Touchpanel Digitiser Control (Measurement Types)
When COO is ‘0’, the WM9713L performs a single measurement – either in polling mode or
continuously, as indicated by the CTC bit.
ADCSEL[7:1] bits. If CTC=0 (polling mode) then only one of the ADCSEL[7:1] bits should be set.
selected
“X,Y,PRESSURE,AUX1,AUX2,AUX3,AUX4…”
The co-ordinate mode (COO = ‘1’) makes it easier to obtain co-ordinate pairs rather than single co-
ordinates. In polling-coordinate mode (CTC = ‘0’, COO = ‘1’), the WM9713L performs an X co-
ordinate, then a Y co-ordinate, followed by a single additional measurement determined by
ADCSEL[7:1], then stops. In continuous-coordinate mode (CTC = ‘1’, COO = ‘1’), the WM9713L
continuously repeats a sequence consisting of an X-co-ordinate,Y co-ordinate, then an additional
measurement determined by ADCSEL[7:1]. At least one of the ADCSEL bits must be set in
continuous coordinate mode when CTC = COO = 1). Should more than one of the ADCSEL[7:1] bits
be set during continuous co-ordinate mode then the additional measurement alternates for every set
of three measurements. For example if ADCSEL_AUX1 and ADCSEL_AUX3 were both selected
whilst CTC = ‘1’, COO = ‘1’ then the following sequence of conversions would be performed:
“X,Y,AUX1,X,Y,AUX3,X,Y,AUX1,X,Y,AUX3…”
If operating in continuous mode (CTC=1), then more than one ADCSEL[7:1] bit may be set and
74h
REGISTER
ADDRESS
conversions
9
8
7
6
5
4
3
2
1
0
BIT
POLL
CTC
ADCSEL_AUX4
ADCSEL_AUX3
ADCSEL_AUX2
ADCSEL_AUX1
ADCSEL_PRESSURE
ADCSEL_Y
ADCSEL_X
COO
will
LABEL
be
performed
0
0
0
0
0
0
0
0
0
0
DEFAULT
The type of measurement is specified by the
cyclically
Writing “1” initiates a measurement.
(when CTC is not set)
0: Polling mode
1: Continuous mode (for DMA)
Enable AUX4 measurement (pin 12)
Enable AUX3 measurement
Enable AUX2 measurement (pin 30)
Enable AUX1 measurement (pin 29)
measurement
Enable touchpanel Y co-ord
measurement
Enable touchpanel X co-ord
measurement
Enable co-ordinate mode
0: Single measurement.
A single measurement is made
depending on the setting of
ADCSEL[7:1].
1: Co-ordinate measurement.
X, then Y, followed by an additional
measurement indicated by ADCSEL[7:1].
If more than one ADCSEL[7:1] bit is
selected then the third, additional,
measurement will alternate sequentially
between those selected.
Enable touchpanel pressure
in
the
DESCRIPTION
following
PP Rev 3.0 June 2006
Pre-Production
order
=>
64