Samsung S3C2451X User Manual page 646

ADC AND TOUCH SCREEN INTERFACE
ADC TOUCH SCREEN CONTROL (ADCTSC) REGISTER
Register
ADCTSC 0x58000004
ADCTSC Bit
UD_SEN [8]
YM_SEN [7]
YP_SEN [6]
XM_SEN [5]
XP_SEN [4]
PULL_UP [3]
AUTO_PST [2]
XY_PST [1:0]
NOTES:
1. While waiting for Touch screen Interrupt, XP_SEN bit should be set to '1'(XP Output disable)
and PULL_UP bit should be set to '0'(XP Pull-up enable).
2. AUTO_PST bit should be set '1' only in Automatic (Sequential) X/Y Position conversion.
3. PULL_UP switche should be eabled during stop/deep stop/sleep mode to avoid leakage current.
Preliminary product information describe products that are in development,
for which full characterization data and associated errata are not yet available.
24-6
Specifications and information herein are subject to change without notice.
Address R/W
R/W ADC touch screen control register
Select interrupt source Stylus Up or Down
0 = Detect Stylus Down Signal.
1 = Detect Stylus Up Signal.
YM to GND Switch Enable
0 = Switch disable.(YM = AIN6, Hi-z)
1 = Switch enable.(YM = VSSA_ADC)
YP to VDD Switch Enable
0 = Switch enable.(YP = VDDA_ADC)
1 = Switch disable.(YP = AIN7, Hi-z)
XM to GND Switch Enable
0 = Switch disable.(XM = AIN8, Hi-z)
1 = Switch enable.(XM = VSSA_ADC)
XP to VDD Switch Enable
0 = Switch enable.(XP = VDDA_ADC)
1 = Switch disable.(XP = AIN9, Hi-z)
XP Pull-up Switch Enable
0 = XP pull-up enable.
1 = XP pull-up disable.
Automatically sequencing conversion of X-Position and Y-Position
0 = Normal ADC conversion.
1 = Auto 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
S3C2451X RISC MICROPROCESSOR
Description
Description
Reset Value
0x058
Initial State
0
0
1
0
1
1
0
0