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PRELIMINARY
ADC AND TOUCH SCREEN INTERFACE
S3C6400 MICROPROCESSOR
39-6
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.
ADC TOUCH SCREEN CONTROL REGISTER (ADCTSC)
Register
Address
R/W
Description
Reset Value
ADCTSC 0x7E00B004 R/W ADC
Touch
Screen Control Register
0x58
ADCTSC
Bit
Description
Initial State
UD_SEN
[8]
Detect Stylus Up or Down status.
0 = Detect Stylus Down Interrupt Signal.
1 = Detect Stylus Up Interrupt Signal.
0
YM_SEN
[7]
YM Switch Enable
0 = YM Output Driver Disable.
1 = YM Output Driver Enable.
0
YP_SEN
[6]
YP Switch Enable
0 = YP Output Driver Enable.
1 = YP Output Driver Disable.
1
XM_SEN
[5]
XM Switch Enable
0 = XM Output Driver Disable.
1 = XM Output Driver Enable.
0
XP_SEN
[4]
XP Switch Enable
0 = XP Output Driver Enable.
1 = XP Output Driver Disable.
1
PULL_UP
[3]
Pull-up Switch Enable
0 = XP Pull-up Enable.
1 = XP Pull-up Disable.
1
AUTO_PST
[2]
Automatic sequencing conversion of X-Position and Y-Position
0 = Normal ADC conversion.
1 = Auto Sequential measurement of X-position, Y-position.
0
XY_PST [1:0]
Manually
measurement
of X-Position or Y-Position.
00 = No operation mode
01 = X-position measurement
10 = Y-position measurement
11 = Waiting for Interrupt Mode
0
Note:
1) While waiting for Touch screen Interrupt, XP_SEN bit must be set to ‘1’, namely ‘XP Output disable’
and PULL_UP bit must be set to ‘0’, namely ‘XP Pull-up enable’.
2) AUTO_PST bit should be set ‘1’ only in Automatic & Sequential X/Y Position conversion.
Touch screen pin conditions in X/Y position conversion.
XP
XM
YP
YM
ADC ch.
select
X
Position
Vref
GND
Hi-Z
Hi-Z
YP
Y
Position
Hi-Z Hi-Z Vref GND
XP