CRTOUCH Datasheet, PDF (47/68 Pages) Freescale Semiconductor, Inc – Capacitive and Resistive Touch Sensing Application Specific IC.

Memory Map and Registers Description
Field
Description
7-5
Reserved
Reserved
6
RTFIFOEN
Resistive Touch FIFO Enable enables storing the resistive touch data inside the FIFO.
3-0
RTFIFOWMRK
Resistive Touch FIFO Watermark indicates the amount of samples needed to signal an
event. When the amount of values stored in the FIFO is greater than or equal to the
watermark configuration, the RTSF bit is set in the Status Register 1.
0 Watermark is disabled. FIFO event is signaled when the FIFO is full.
1–15 FIFO event will be signaled when the FIFO counter reaches this value.
4.2.3.4 Resistive touch sampling rate
This register is used to configure the period to sample the resistive touch screen.
Bit
7
6
5
4
3
2
1
0
Field
RTSAMPLING
Signal
Description
7–0
Value in miliseconds to indicate the scanning period. Value must be between 5 and 100 (10 points per
RTSAMPLING second to 200 points per second).
4.2.3.5 X coordinate stabilization time
This 16-bit value holds the number needed in micro-seconds for the signals required for an X coordinate scanning to stabilize.
The value is calculated automatically as part of the calibration process but can be written through serial communication to
simplify factory configuration of devices.
Bit
15 14 13 12 11 10 9
8
7 65 4
3
2
1
0
Field
XCTIMESETMSB
XCTIMESETLSB
Signal
Description
15–8
Most significant byte for the X coordinates stabilization delay.
X Coordinate
stabilization MSB
7–0
Least significant byte for the X coordinates stabilization delay
X Coordinate
stabilization LSB
CRTouch Data Sheet, Rev. 3
Freescale Semiconductor
47