UR7HCDMP-A-DW(V4) Просмотр технического описания (PDF) - Semtech Corporation
Номер в каталоге
Компоненты Описание
производитель
UR7HCDMP-A-DW Datasheet PDF : 12 Pages
| |||
PS/2 COMMANDS (CONT’D)
When the HulaCoder™ receives the
Set Sampling Rate Command
(0xF3), it responds in both stream
and prompt modes, but updates its
internal status only in stream mode.
The HulaCoder™ responds to the
the Read Device Type
Command (0xF2) immediately
after the Acknowledge with a 0x00.
The Set Prompt (Remote)
Mode Command (0xF0) sets the
device to prompt mode. Data
values are then reported only in
response to a Read Report
Command (0xEB).
The Set Echo Mode Command
(0xEE) is enables echo mode; with
this mode enabled, the
HulaCoder™ immediately returns
any data bytes except 0xFF or
0xEC.
SEQUENTIAL COMMANDS
A sequential command consists of a strictly specified, unbroken sequence
of individual commands.
The HulaCoder™ implements a special sequential command that can be
used to determine its ability to report three buttons. This sequential
command is a series of commands to the HulaCoder™ that cause the IC to
give a special response to the last command (Read Status).
Sequence of commands:
1. Set Resolution = one count/mm
Direct: 0xE8,0x00 BIOS: INT0x15, AX=0xC203, BX=0
2. Set Scaling = 1:1
Direct: 0xE6
BIOS: INT0x15, AX=0xC206, BX=1
3. Set Scaling = 1:1
Direct: 0xE6
BIOS: INT0x15, AX=0xC206, BX=1
4. Set Scaling = 1:1
Direct: 0xE6
BIOS: INT0x15, AX=0xC206, BX=1
5. Read Status
Direct: 0xE9
BIOS: INT0x15, AX=0xC206, BX=0
The Reset Echo Mode
Command (0xEC) disables echo
mode. If this command occurs
while the HulaCoder™ is in either
stream or prompt Modes, the
command is ignored.
The Read Report Command
(0xEB) prompts the HulaCoder™ for
a report. The report occurs even if
the device has not moved and the
status of the switches has not
changed. The report is sent by the
HulaCoder™ following an
Acknowledge.
The Set Incremental Stream
Mode Command (0xEA) sets the
HulaCoder™ to stream mode and
disables the device.
The response to the Read Status Command is in the form:
Byte 1: Standard Status Information (buttons, scaling, etc.)
Byte 2: Number of mouse buttons (3)
Byte 3: Firmware Revision Number (encoded)
The individual commands that comprise this sequential command have
been designed so that a sequential command can be sent to the
HulaCoder™ via the standard IBM PS/2 BIOS calls, and the IC only returns
a valid response to the Standard Status Request. This ensures that, if the
sequential command is sent via the BIOS, the status response is returned
accurately even if the BIOS does error detection. Thus, a programmer can
have complete control of the mouse without having to access the device
hardware port directly.
Copyright ©1995-2002 Semtech Corporation
5
DOC7-DMP-DS-109
www.semtech.com
Share Link: 