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31.5.2
Clocks
The clock for the CAT module, CLK_CAT, is generated by the Power Manager (PM). This clock
is turned on by default, and can be enabled and disabled in the PM. The user must ensure that
CLK_CAT is enabled before using the CAT module.
QMatrix operations also require the CAT generic clock, GCLK_CAT. This generic clock is gener-
ated by the System Control Interface (SCIF), and is shared between the CAT and the Analog
Comparator Interface. The user must ensure that the GCLK_CAT is enabled in the SCIF before
using QMatrix functionality in the CAT module. For proper QMatrix operation, the frequency of
GCLK_CAT must be less than half the frequency of CLK_CAT. If only QTouch functionality is
used, then GCLK_CAT is unnecessary.
31.5.3
Interrupts
The CAT interrupt request line is connected to the interrupt controller. Using CAT interrupts
requires the interrupt controller to be programmed first.
31.5.4
Peripheral Events
The CAT peripheral events are connected via the Peripheral Event System. Refer to the Periph-
eral Event System chapter for details.
31.5.5
Peripheral Direct Memory Access
The CAT module provides handshake capability for a Peripheral DMA Controller. One hand-
shake controls transfers from the Acquired Count Register (ACOUNT) to memory. A second
handshake requests burst lengths for each (X,Y) pair to the Matrix Burst Length Register
CSB8
SNSK8
X9
SP8
CSA9
SNS9
Y4
SP9
CSB9
SNSK9
YK4
SP9
CSA10
SNS10
X10
SP10
CSB10
SNSK10
X11
SP10
CSA11
SNS11
Y5
SP11
CSB11
SNSK11
YK5
SP11
CSA12
SNS12
X12
SP12
CSB12
SNSK12
X13
SP12
CSA13
SNS13
Y6
SP13
CSB13
SNSK13
YK6
SP13
CSA14
SNS14
X14
SP14
CSB14
SNSK14
X15
SP14
CSA15
SNS15
Y7
SP15
CSB15
SNSK15
YK7
SP15
CSA16
SNS16
X16
SP16
CSB16
SNSK16
X17
SP16
Table 31-2.
Pin Selection Guide
CAT Module Pin
Name
QTouch Method
Pin Name
QMatrix Method Pin
Name
Selection Bit in
PINMODEx Register