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ADC AND TOUCH SCREEN INTERFACE
Programming Notes
1.
The A/D converted data can be accessed by means of interrupt or polling method. With interrupt method
the overall conversion time - from A/D converter start to convert data read - may be delayed because of
the return time of interrupt service routine and data access time. Polling method is used to check the
ADCCON[15] - end of conversion flag-bit. The read time can be determined from ADCDAT register.
2.
Another method to start A/D conversion is provided. After ADCCON[1] - A/D conversion start-by-read
mode-is set to 1. A/D conversion starts simultaneously when converted data is read.
XP
YP
2. If wakeup source in STOP mode is used, XY_PST bit(ADCTSC[1:0] ) should be set to Waiting for interrupt
mode(2'b11). To choose stylus pen up/down wakeup, UD_SEN bit(ADCTSC[8]) is used.
Preliminary product information describe products that are in development,
for which full characterization data and associated errata are not yet available.
39-4
Specifications and information herein are subject to change without notice.
X-Conversion
Pen Touch
X-Tal CLK
is used
Figure 39-2 ADC and Touch Screen Operation signal
Y-Conversion
GCLK
is used
S3C6400 MICROPROCESSOR
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