ur7hcpxz-p440 Semtech Corporation, ur7hcpxz-p440 Datasheet - Page 7

• Manufacturer Part Number: ur7hcpxz-p440
• Description: Advanced Click-to-select No-drifttm Ps/2 Force Stick Controller
• Manufacturer: Semtech Corporation

Copyright Semtech 2000-2001
DOC7-PXZ-P440-DS-111
Unlike normal commands, sequential commands must be enacted with a
sequence of commands. If the sequence is not consecutive or is incorrect,
the PixiPoint
normally respond to a command.
The individual commands that comprise a sequential command have been
designed so that the elements of a sequential command can be sent to the
PixiPoint
valid response to the Status Request. This ensures that, if the sequential
command is sent via the BIOS, the status response will be accurately
returned even if the BIOS performs error detection. Thus, a programmer
can have complete control of the mouse without having to access the
device hardware port directly.
The UR7HCPXZ-P440 implements a special sequential command that can
be used to determine its ability to report three buttons. The sequential
command is a series of commands to the PixiPoint
device to respond to the last command (Read Status) with alternate
information.
The sequence of commands is as follows.
1. Set Resolution = one count/ mm
2. Set Scaling = 1:1
3. Set Scaling = 1:1
4. Set Scaling = 1:1
5. Read Status
The response to the Read Status Command is in the following format.
Byte 1: Standard Status Information (buttons, scaling, etc.)
Byte 2: Number of mouse buttons (3)
Byte 3: Firmware Revision Number (encoded) or current sampling rate
SEQUENTIAL COMMANDS
7
TM
Z via the standard IBM PS/2 BIOS calls and the device returns a
TM
Z aborts the detection and responds the way it would
(E8H)
(E6H)
(E6H)
(E6H)
(E9H)
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TM
Z that cause the