S3C2440X Datasheet, PDF (290/429 Pages) Samsung semiconductor – 16/32-bit RISC microprocessor

2003.09.25
ADC AND TOUCH SCREEN INTERFACE
S3C2440X RISC MICROPROCESSOR
ADC TOUCH SCREEN CONTROL REGISTER (ADCTSC)
Register
ADCTSC
Address
0x5800004
R/W
R/W
Description
ADC Touch Screen Control Register
Reset Value
0x58
ADCTSC
Bit
Description
Initial State
UD_SEN
[8] Detect Stylus Up or Down status.
0
0 = Detect Stylus Down Interrupt Signal.
1 = Detect Stylus Up Interrupt Signal.
YM_SEN
[7] YM Switch Enable
0
0 = YM Output Driver Disable.
1 = YM Output Driver Enable.
YP_SEN
[6] YP Switch Enable
1
0 = YP Output Driver Enable.
1 = YP Output Driver Disable.
XM_SEN
[5] XM Switch Enable
0
0 = XM Output Driver Disable.
1 = XM Output Driver Enable.
XP_SEN
[4] XP Switch Enable
1
0 = XP Output Driver Enable.
1 = XP Output Driver Disable.
PULL_UP
[3] Pull-up Switch Enable
1
0 = XP Pull-up Enable.
1 = XP Pull-up Disable.
AUTO_PST
[2] Automatically sequencing conversion of X-Position and Y-Position
0
0 = Normal ADC conversion.
1 = Auto Sequential measurement of X-position, Y-position.
XY_PST
[1:0] Manually measurement of X-Position or Y-Position.
0
00 = No operation mode
01 = X-position measurement
10 = Y-position measurement
11 = Waiting for Interrupt Mode
NOTE: 1) While waiting for Touch screen Interrupt, XP_SEN bit should be set to ‘1’, namely ‘XP Output disable’
and PULL_UP bit should 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
X Position
Vref
GND
Hi-Z
Y Position
Hi-Z
Hi-Z
Vref
YM
Hi-Z
GND
ADC ch. select
YP
XP
7-6
Preliminary product information describes 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.