Datasheet

773
32142D–06/2013
ATUC64/128/256L3/4U
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