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 MODE COMMANDS
When the Reset Command
(0xFF) is enacted, the HulaCoder™
sets the following default
parameters: Incremental Stream
Mode, 1:1, scaling, disabled, and a
report rate of 100 Hz and then
sends 0xAA to the host followed by
a device ID of 0x00.
The host sends the Resend Last
Data Stream Command (0xFE)
when it detects an error in any
transmission from the HulaCoder™.
The HulaCoder™ then resends the
last output data stream to the host.
This transmission occurs after a
HulaCoder™ transmission and
before the host enables the
interface allowing the next
HulaCoder™ output.
The Set Default Status
Command (0xF6) re-initializes the
device to its condition at power-up.
The Disable Command (0xF5)
stops the device from transmitting
all reports. However, the mode
does not change; and the
HulaCoder™ is still able to respond
to commands. If the Disable
Command is issued while the
device is transmitting a report, the
HulaCoder™ immediately stops the
transmission and disables itself.
If the HulaCoder™ is in Incremental
Stream Mode, the Enable
Command (0xF4) allows it to
begin data transmission. If the
device is in Prompt Mode, the
Enable Command updates the
internal status of the HulaCoder™,
but does not allow the device to
transmit reports of motion or button
data to the host.
PS/2 DATA FORMAT
The following table shows the data report format. Values are expressed in
a two’s complement format with a separate sign bit. If there is an overflow
of the accumulator, the maximum positive or negative count is reported and
the corresponding overflow bit is set.
Byte 1
b0
b1
b2
b3
b4
b5
b6
b7
Byte 2
b0
b1
b2
b3
b4
b5
b6
b7
Byte 3
b0
b1
b2
b3
b4
b5
b6
b7
Left Button status
Right Button Status
Middle Button Status
Always = 1
X8: MSB (sign) of X data
Y8: MSB (sign) of Y data
X data overflow
Y data overflow
1 = depressed
1 = depressed
1 = depressed
1 = negative
1 = negative
1 = overflow
1 = overflow
X0: LSB of X data
X1
X2
X3
X4
X5
X6
X7
Y0: LSB of Y data
Y1
Y2
Y3
Y4
Y5
Y6
Y7
Status Report Format Table
Byte 1
b0
b1
b2
b3
b4
b5
b6
b7
Byte 2
Byte 3
Right Button
1 = depressed
Middle Button
1 = depressed
Left Button
1 = depressed
Always = 0
Scaling - 1:1 (0) / 2:1 (1)
Disable - (0) / enable (1)
Stream - (0) / prompt (1) mode
Always = 0
b0 - 1 Current resolution setting
b2 - 7 Always = 0
b0-7 Current sampling rate
Copyright ©1995-2002 Semtech Corporation
4
DOC7-DMP-DS-109
www.semtech.com
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