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ADC AND TOUCH SCREEN INTERFACE S3C2410A
16-6
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 converted data read - may be delayed because of
the return time of interrupt service routine and data access time. With polling method, by checking the
ADCCON[15] - end of conversion flag-bit, the read time from ADCDAT register can be determined.
2. A/D conversion can be activated in different way: After ADCCON[1] - A/D conversion start-by-read
mode-is set to 1, A/D conversion starts simultaneously whenever converted data is read.
Stylus Down
XP
YP
X-Conversion Y-Conversion
Stylus Up
A CB
A
=
D
x (1/X-Tal Clock) or
A
=
D
x (1/External Clock)
B
=
D
x (1/PCLK)
C
=
D
x (1/PCLK)
D
= DELAY value of ADCDLY Register
Figure 16-3 Timing Diagram in Auto (Sequential) X/Y Position Conversion Mode