UR7HCDMP-A-DW(V4) Ver la hoja de datos (PDF) - Semtech Corporation
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UR7HCDMP-A-DW Datasheet PDF : 12 Pages
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PS/2 COMMANDS (CONT’D)
The Status Request command
(0xE9) returns a 3 byte status
report.
The Set Resolution command
(0xE8) controls resolution, and the
Set 2:1 Scaling Command (0xE7)
enables a coarse/fine tracking
response. The HulaCoder™ uses
its advanced motion algorithm, so
although Set Resolution and
Scaling commands are
acknowledged and reported as
activated, their content is ignored.
The Set 1:1 Scaling Command
(0xE6) enables the values of
movements to be transmitted to the
host without any scaling.
SERIAL MODE
Communication through the serial
port is half-duplex at a fixed speed
of 1200 Baud, 7N2 protocol.
At start-up and after each RTS
toggle the HulaCoder™ sends a
two-character ASCII string “M3”
indicating 3-button capability to the
host.
SERIAL DATA REPORT FORMAT TABLE
Byte 1
b0
b1
b2
b3
b4
b5
b6
Byte 2
b0
b1
b2
b3
b4
b5
b6
Byte 3
b0
b1
b2
b3
b4
b5
b6
Byte 4
b0 - 4
b5
b6
X6
X7: MSB of X Data
Y6
Y7: MSB of Y Data
Right Button Status
Left Button Status
Always=1
X0: LSB of X data
X1
X2
X3
X4
X5
Always=0
Y0: LSB of Y data
Y1
Y2
Y3
Y4
Y5
Always=0
Always = 0
Middle Button Status 1=depressed
Always=0
A data report is sent if motion is
detected, or if buttons are pressed
or released. Motion is reported
relative to the last report sent, in a
two’s complement form and eight
(8) bit resolution. In other words,
the maximum motion values are -
128 to +127, saturated at min/max
for faster speeds. Byte 4 is sent
only if the middle button is pressed,
held-down, or released.
1 = depressed
1 = depressed
Copyright ©1995-2002 Semtech Corporation
6
DOC7-DMP-DS-109
www.semtech.com
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