CRTOUCH Datasheet, PDF (44/68 Pages) Freescale Semiconductor, Inc – Capacitive and Resistive Touch Sensing Application Specific IC.

Memory Map and Registers Description
Signal
Description
7
CTSSTOUCH
6
CTSSINV
5-
Reserved
4-0
CTDSVAL
Capacitive Touch Static Status Touch indicates if a touch in the control is being detected
at the moment of reading.
Capacitive Touch Static Status Invalid flag Indicates if an invalid combination of touched
electrodes is being detected. An invalid combination is detected when two or more non
adjacent electrodes are detected as touched, for example electrodes 0 and 2.
Reserved
Capacitive Touch Static Status Value indicates the absolute position within the control that
is actuated.
NOTE
For rotary and sliders, the number of positions is greater than the number of electrodes. The
device reports different positions when more than one electrode is being touched. For more
details, review Section 2.2.3, “Rotary and slider control”
4.2.2.7 Capacitive electrodes FIFO (read only)
When electrodes are configured as keypad, capacitive electrodes FIFO keeps status information from capacitive electrode 0 to 3.
Bit
7
6
5
Field
CTFIFOTOUCH
Reserved
4
3
2
CTFIFOKEY
1
0
Signal
Description
7
Capacitive Touch FIFO Touch indicates if the event was a release or a touch event. 1
CTFIFOTOUCH Indicates the key was released
5-
Reserved
Reserved
5-0
Capacitive Touch FIFO Key determines the key on which the event has occurred
CTFIFOKEY
4.2.3 Resistive Touch Configuration registers
All the Resistive Touch Status registers have read and write attributes. Care must be taken that the written value is valid for the
specific register written
4.2.3.1 Resistive and Capacitive Touch Configuration register
The Resistive and Capacitive Touch Configuration register is used to configure the different settings used as part of the resistive
and capacitive scanning processes. All the configuration bits except CRTSHTDWN are non-volatile and recovered to their latest
value as part of the part reset sequence.
CRTouch Data Sheet, Rev. 3
44
Freescale Semiconductor