CRTOUCH Datasheet, PDF (45/68 Pages) Freescale Semiconductor, Inc – Capacitive and Resistive Touch Sensing Application Specific IC.

Memory Map and Registers Description
Bit
Field
7
RTPRESEN
6
5
CTCNTRL
4
3
2
1
0
RTSLDEN RTROTEN RTPNCEN CRTSLEEP CRTSHTDWN
Field
Description
7
Resistive touch pressure enable bit is used to enable the pressure measurement on the resistive touch
RTPRESEN screen as part of the X and Y scanning process. If FIFO is enabled, changing the value of this bit will
automatically flush the FIFO to synchronize X, Y, and pressure buffers.
6-5
Capacitive Touch Control defines the type of control used for the four capacitive electrodes that can be
CTCNTRL connected to CRTouch.
CTCNTRL CTCNTRL
1
0
Configuration
1
1
Keypad control selected
1
0
Slider control selected
0
1
Rotary control selected
0
0
Capacitive keys disabled
4
RTSLDEN
Resistive Touch Slide Enable — A single touch slide can be detected if the X and Y coordinates fit in the
slide gesture description. Status registers 1 and 2 are used to indicate when the slide gesture was
detected and the slide direction.
3
Resistive Touch Rotate Enable — Status registers 1 and 2 are used to indicate when the Rotate gesture
RTROTEN was detected and if it was a clock-wise or counter-clock-wise gesture.
2
RTZMEN
Resistive Touch Zoom Enable — This bit controls if zoom motions on the touch screen are detected and
reported. Status registers 1 and 2 are used to indicate when the pinch gesture is detected and if it was a
zoom-in or zoom out gesture.
1
CRTSLEEP
Capacitive Resistive Touch sleep is used to send the deviceinto sleep mode. Section 2.3.2, “Sleep mode”
has detailed information on the CRTouch behavior while in sleep mode.
1 Sleep mode enabled
0 Sleep mode disabled
0
Capacitive Resistive Touch Shutdown is used to configure the CRTouch into its lowest power mode
CRTSHTDWN available. Section 2.3.3, “Shutdown mode” has detailed information on the CRTouch behavior when this bit
is enabled. Shutdown is the only bit in the configuration register that is not restored after a reset.
1 Shutdown mode enabled
0 Shutdown mode disabled
4.2.3.2 Resistive and Capacitive Triggers register
The Resistive and Capacitive Triggers register configures what events will assert the TOUCHPENDING pin. This can be used
to signal to an external host that there is a pending activity to be read in the status registers. The Triggers register also contains
a bit used by the host to send CRTouch into calibration mode—see Section 2.1.4, “Calibration process.” All bits except for the
Calibration bit are non-volatile. A 1 enables the event to assert the TOUCHPENDING pin.
CRTouch Data Sheet, Rev. 3
Freescale Semiconductor
45