AT32UC3L064_1 Datasheet, PDF (665/825 Pages) ATMEL Corporation – AVR32 32-bit Microcontroller

28.4 I/O Lines Description
AT32UC3L
Table 28-1.
Name
CSAn
CSBn
DIS
SMP
SYNC
VDIVEN
I/O Lines Description
Description
Capacitive sense A line n
Capacitive sense B line n
Discharge current control (only used for QMatrix)
SMP line (only used for QMatrix)
Synchronize signal
Voltage divider enable (only used for QMatrix)
Type
I/O
I/O
Analog
Output
Input
Output
28.5 Product Dependencies
28.5.1 I/O Lines
In order to use the CAT module, other parts of the system must be configured correctly, as
described below.
The CAT pins may be multiplexed with other peripherals. The user must first program the I/O
Controller to give control of the pins to the CAT module. In QMatrix mode, the Y lines must be
driven by the CAT and analog comparators sense the voltage on the Y lines. Thus, the CAT (not
the Analog Comparator Interface) must be the selected function for the Y lines in the I/O
Controller.
By writing ones and zeros to bits in the Pin Mode Registers (PINMODEx), most of the CAT pins
can be individually selected to implement the QTouch method or the QMatrix method. Each pin
has a different name and function depending on whether it is implementing the QTouch method
or the QMatrix method. The following table shows the pin names for each method and the bits in
the PINMODEx registers which control the selection of the QTouch or QMatrix method.
Table 28-2. Pin Selection Guide
CAT Module Pin
Name
QTouch Method
Pin Name
QMatrix Method Pin
Name
Selection Bit in
PINMODEx Register
CSA0
SNS0
X0
SP0
CSB0
SNSK0
X1
SP0
CSA1
SNS1
Y0
SP1
CSB1
SNSK1
YK0
SP1
CSA2
SNS2
X2
SP2
CSB2
SNSK2
X3
SP2
CSA3
SNS3
Y1
SP3
CSB3
SNSK3
YK1
SP3
CSA4
SNS4
X4
SP4
CSB4
SNSK4
X5
SP4
CSA5
SNS5
Y2
SP5
32099A–AVR32–06/09
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