UR7HCTS2-P840 Datasheet, PDF (6/16 Pages) Semtech Corporation – High-Performance, Low Power PS/2 Touch Screen Controller/Digitizer

PS/2 DATA FORMAT
The following table shows the data
report format. X and Y values are
expressed as 9-bit Two’s
Complement signed integers, with
the sign bit / most significant bit
separate. If there is an overflow of
the accumulator, the maximum
positive or negative count is
reported and the corresponding
overflow bit is set.
EXTENDED PS/2 PROTOCOL
Semtech offers a high-performance
driver for Windows 95, Windows 98,
Windows Me, and Windows NT.
Please check with Semtech for other
driver availability.
Those that wish to undertake their
own driver development will need to
request from Semtech the document
covering the extended PS/2 protocol
used by the UR7HCTS2-P840.
DATA REPORT FORMAT TABLE
Byte 1
b0
Left Button status
b1
Right Button Status
b2
Middle Button Status
b3
Reserved
b4
X8: MSb of X data, sign bit
b5
Y8: MSb of Y data, sign bit
b6
X data overflow
b7
Y data overflow
Byte 2
b0
X0: LSb of X data
b1
X1
b2
X2
b3
X3
b4
X4
b5
X5
b6
X6
b7
X7:
Byte 3
b0
Y0: LSb of Y data
b1
Y1
b2
Y2
b3
Y3
b4
Y4
b5
Y5
b6
Y6
b7
Y7:
Byte 4 (only for Wheelmouse-type devices)
b0
Z0: LSb of Z data
b1
Z1
b2
Z2
b3
Z3
b4
Z4
b5
Z5
b6
Z6
b7
Z7: MSb of Z data
STATUS REPORT FORMAT TABLE
Byte 1
b0
b1
b2
b3
b4
b5
b6
b7
Byte 2
b0 - 1
b2 - 7
Byte 3
b0-7
Right Button
Middle Button
Left Button
Reserved
Scaling - 1:1 (0) / 2:1 (1)
Disable - (0) / enable (1)
Stream - (0) / prompt (1) mode
Current resolution setting
Current sampling rate
1 = depressed
1 = depressed
1 = depressed
Always = 1
1 = negative
1 = negative
1 = overflow
1 = overflow
1 = depressed
1 = depressed
1 = depressed
Always = 0
Always = 0
Always = 0
Copyright ©1999-2001 Semtech Corporation
6
DOC7-TS2-P840-DS-106
www.semtech.com