Touch Panel Functions - Renesas SH7727 General Information Manual

R0P7727TH003TRKE General Information Manual

6.4 Touch Panel Functions

This section describes the touch panel functions. In addition, Table 6.4 summarizes the touch panel registers.
For details of each register, refer to 6.4.1 to 6.4.32.
(1) The A/D conversion value of the X or Y position sensed by pen touch is output.
(2) Pen touch ON/OFF interrupt function
Sampling takes place at intervals of 20msec to 100msec. When the results (A/D conversion value of
the X or Y position) obtained three times from sampling are approximate to each other, a pen touch
ON interrupt is generated for SH7727. In addition, when the touch panel is turned off, a pen touch
OFF interrupt is generated.
(3) To keep the pen touch "ON," sampling is performed at intervals of 20msec to 100msec and a pen
touch ON interrupt is generated if the results obtained from sampling are approximate to each other.
(4) Calibration function
Calibration is performed when two points on the touch panel are touched with the pen.
After completion of calibration, the X and Y positions are converted into the LCD
drawing dot positions for output.
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Power Supply Controller