Samsung S3C6400X User Manual page 1133

ADC AND TOUCH SCREEN INTERFACE
ADC TOUCH SCREEN CONTROL REGISTER (ADCTSC)
Register Address
ADCTSC 0x7E00B004
ADCTSC
UD_SEN
YM_SEN
YP_SEN
XM_SEN
XP_SEN
PULL_UP
AUTO_PST
XY_PST [1:0]
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.
X Position
Y Position
Preliminary product information describe products that are in development,
for which full characterization data and associated errata are not yet available.
39-6
Specifications and information herein are subject to change without notice.
R/W
R/W
Bit
[8] Detect Stylus Up or Down status.
0 = Detect Stylus Down Interrupt Signal.
1 = Detect Stylus Up Interrupt Signal.
[7] YM Switch Enable
0 = YM Output Driver Disable.
1 = YM Output Driver Enable.
[6] YP Switch Enable
0 = YP Output Driver Enable.
1 = YP Output Driver Disable.
[5] XM Switch Enable
0 = XM Output Driver Disable.
1 = XM Output Driver Enable.
[4] XP Switch Enable
0 = XP Output Driver Enable.
1 = XP Output Driver Disable.
[3] Pull-up Switch Enable
0 = XP Pull-up Enable.
1 = XP Pull-up Disable.
[2] Automatic sequencing conversion of X-Position and Y-Position
0 = Normal ADC conversion.
1 = Auto Sequential measurement of X-position, Y-position.
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
XP XM
Vref GND
Hi-Z Hi-Z
Description
ADC Touch Screen Control Register
Description
YP
Hi-Z
Vref
S3C6400 MICROPROCESSOR
Reset Value
YM ADC ch. select
Hi-Z YP
GND XP
0x58
Initial State
0
0
1
0
1
1
0
0