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PRELIMINARY
ADC AND TOUCH SCREEN INTERFACE
S3C6400 MICROPROCESSOR
39-4
Preliminary product information describe products that are in development,
for which full characterization data and associated errata are not yet available.
Specifications and information herein are subject to change without notice.
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
X-Tal CLK
is used
X-Conversion
YP
GCLK
is used
Y-Conversion
Pen Touch
Figure 39-2 ADC and Touch Screen Operation signal
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.