CRTOUCH Datasheet, PDF (51/68 Pages) Freescale Semiconductor, Inc – Capacitive and Resistive Touch Sensing Application Specific IC.

4.2.4.3 X and Y two touch constant values
These values are used for calculations on two touch gestures.
Memory Map and Registers Description
Bit
15
Field
14
13 12 11 10 9
8
7 65 4 3 2 1
0
X/YCONSTMSB
X/YCONSTLSB
Signal
Description
15–8
Most significant byte for the X/Y two touch constant calibration value.
X/YCONSTMSB
7–0
Least significant byte for the X/Y two touch constant calibration value.
X/YCONSTLSB
4.2.5 TSS Configuration registers
4.2.5.1 Capacitive system configuration
Bit
Field
7
6
Reserved
5
DCTRACKEREN
4
3
2
STUCKKEYEN Reserved CLPEN
1
0
Reserved
Signal
7–6
Reserved
5
DCTRACKEREN
4
STUCKKEYEN
3
Reserved
2
CLPEN
1–0
Reserved
Reserved
Description
DC Tracker Enable — This bit enables the DC tracker to continuously adjust the
electrode capacitance baseline. The periodicity at which the baseline is adjusted is
determined by the DC Tracker Rate.
Stuck Key Enable — This bit enables the baseline recalibration of a touched electrode
after a period of time. If the electrode remains touched for as long as the Stuck Key
Timeout register defines, then the electrode baseline is recalculated and as a
consequence the electrode is released.
Reserved
Capacitive Low Power Enable — This bit enables one of the four electrodes to wake the
system from Shutdown mode. When this bit is enabled, no electrodes are scanned while
in Run mode. This bit should be enabled only prior to entering into Shutdown mode. This
bit is not restored and will always be 0 after a reset.
Reserved
CRTouch Data Sheet, Rev. 3
Freescale Semiconductor
51