CRTOUCH Datasheet, PDF (46/68 Pages) Freescale Semiconductor, Inc – Capacitive and Resistive Touch Sensing Application Specific IC.

Memory Map and Registers Description
Bit
Field
7
RTREL
6
5
4
RTCAL RTPINCH RTSLD
3
2
RTROT RTFIFOWM
1
CTEV
0
RTEV
Field
Description
7
RTREL
6
RTCAL
5
RTZOOM
4
RTROT
3
RTSLD
2
RTFIFOWM
1
CTEV
0
RTEV
Resistive touch release bit is used to generate a signal when the resistive touch screen is
released.
Resistive touch Calibration bit sends the CRTouch into calibration mode. After this bit is
enabled, the system behavior is Section 2.1.4, “Calibration process.” Writing a 0 to this bit
while in a calibration process aborts the calibration. Calibration mode is finished after the
calibration points have been identified or with a reset.
Resistive Touch Pinch trigger bit configures the external event pin to be asserted when a
Zoom-in or Zoom out is detected.
Resistive Touch Rotate trigger bit configures the external event pin asserted when a
clock-wise or counter-clock-wise rotate gesture is detected.
Resistive Touch Slide trigger bit configures the external event pin asserted when a slide
gesture in any direction is detected.
Resistive Touch FIFO Watermark bit is used to generate a signal after the number of
samples in the FIFO is greater than or equal to the Watermark bits configuration in the FIFO
setup register
Capacitive Touch Event is used to generate a pending activity signal when any capacitive
event is detected. Capacitive events detection is configured in the Capacitive Events
register.
Resistive Touch Event signals the host after each sampling period after the signals have
been processed and the coordinates have been determined, as well as any resistive event.
4.2.3.3 FIFO Setup register
Any writes to this register will automatically flush the FIFO of any stored elements.
Bit
7
6
5
4
3
2
1
0
Field
Reserved
RTFIFOEN
RTFIFOWMRK
CRTouch Data Sheet, Rev. 3
46
Freescale Semiconductor