Samsung S5PC100, User Manual

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S5PC100 USER’S MANUAL (REV1.0) ADC AND TOUCH SCREEN INTERFACE
10.7-9
8.2 ADC TOUCH SCREEN CONTROL REGISTER (ADCTSC, R/W, ADDRESS = 0XF300_0004)
ADCTSC Bit Description Reset Value
UD_SEN [8] Detects Stylus Up or Down status.
0 = Detects Stylus Down Interrupt Signal.
1 = Detects Stylus Up Interrupt Signal. 0
YM_SEN [7] YM to GND Switch Enable
0 = Disables Switch (YM = AIN6, Hi-z)
1 = Enables Switch (YM = VSSA_ADC) 0
YP_SEN [6] YP to VDD Switch Enable
0 = Enables Switch (YP = VDDA_ADC)
1 = Disables Switch (YP = AIN7, Hi-z) 1
XM_SEN [5] XM to GND Switch Enable
0 = Disables Switch (XM = AIN8, Hi-z)
1 = Enables Switch (XM = VSSA_ADC) 0
XP_SEN [4] XP to VDD Switch Enable
0 = Enables Switch (XP = VDDA_ADC)
1 = Disables Switch (XP = AIN9, Hi-z) 1
PULL_UP [3] Pull-up Switch Enable
0 = Enables XP Pull-up
1 = Disables XP Pull-up 1
AUTO_PST [2] Automatic sequencing conversion of X-Position and Y-Position
0 = Normal ADC conversion.
1 = Auto Sequential measurement of X-position and 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
NOTES:
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 and Sequential X/Y Position conversion.
3. If you do not use AIN[7], you must tie AIN [7] to VDDA_ADC or ADCTSC register must be set to 0xd3.
8.3 TOUCH SCREEN PIN CONDITIONS IN X/Y POSITION CONVERSION.
XP XM YP YM ADC ch. select
X Position Vref GND AIN[7] Hi-Z YP
Y Position AIN[9] Hi-Z Vref GND XP