Samsung S3C2451X User Manual page 642

ADC AND TOUCH SCREEN INTERFACE
ADC & TOUCH SCREEN INTERFACE OPERATION
BLOCK DIAGRAM
Figure 24-1 shows the functional block diagram of A/D converter and touch screen interface. Note that the A/D
converter device is a recycling type.
VDDA_ADC
AIN9(XP)
AIN8(XM)
AIN7(YP)
AIN6(YM)
AIN[5:0]
Preliminary product information describe products that are in development,
for which full characterization data and associated errata are not yet available.
24-2
Specifications and information herein are subject to change without notice.
PULL_UP
XM_SEN
YM_SEN
VDDA_ADC
XP_SEN
YP_SEN
VDDA_ADC
10:1
MUX
ADC input
control
Figure 24-1. ADC and Touch Screen Interface Block Diagram
Touch screen
pads control
A/D
Converter
Waiting for interrupt
S3C2451X RISC MICROPROCESSOR
ADC
interface
&
Touch
screen
control
SUBINT_ADC
Interrupt
generation SUBINT_TC