參數(shù)資料
型號(hào)： MTA41300/SO
元件分類(lèi)： 微控制器/微處理器
英文描述： SPECIALTY MICROPROCESSOR CIRCUIT, PDSO18
封裝： 0.300 INCH, PLASTIC, SOIC-18
文件頁(yè)數(shù)： 24/28頁(yè)
文件大?。?/td> 466K
代理商： MTA41300/SO
1995 Microchip Technology Inc.
DS40101C-page 5
MTA41300
3.0
IBM PS/2 MODE OPERATION
Upon power-up the MTA41300 mouse controller
initiates an internal reset sequence. First, all internal
registers and communication parameters are cleared.
Next, the status registers are set to the default
condition. Finally, if the MTA41300 receives a Resend
command as the first command after power-up, it will
transmit a AAh followed by a 00h in response. This
notifies the host that the initialization is complete and
that the controller is a standard mouse type. This is to
ensure compatibility with some hosts that do not follow
the normally recommended behavior of issuing a Reset
command as the first command after power-up.
The MTA41300 always confirms reception of a
command
sent
by
the
host
by
returning
an
acknowledge byte (FAh). If the host interrupts the
transmission of the acknowledge byte, the MTA41300
discards the complete command. The MTA41300 is
then ready to receive and acknowledge the next
command. Two exceptions to the acknowledge after
command received rule exist. The MTA41300 does not
issue an acknowledge upon receipt of either the Set
Wrap Mode (EEh) or Resend (FEh) commands.
3.1
PS/2 Mode Commands
3.1.1
RESET
CODE: FFH
This command initiates a reset sequence in the
MTA41300 mouse controller. First, all internal registers
and communication parameters are cleared. Next, the
status registers are set to the default condition. Finally,
the MTA41300 transmits a AAh followed by a 00h, this
notifies the host that the initialization is complete and
that the controller is a standard mouse type.
Command Summary:
Command
Code
Reset
FFh
Resend
FEh
Set Default
F6h
Disable Reporting
F5h
Enable Reporting
F4h
Set Report Rate
F3h, XXh
Read Device Type
F2h
Set Remote Mode
F0h
Set Wrap Mode
EEh
Reset Wrap Mode
ECh
Read Data
EBh
Set Stream Mode
EAh
Status Request
E9h
Set Resolution
E8h, XXh
Set Scaling
E7h
Reset Scaling
E6h
3.1.2
RESEND
CODE: FEH
Anytime the MTA41300 controller receives an invalidly
formatted
command,
it
will
transmit
a
Resend
command to the host. The controller will ignore invalid
commands and will continue to operate in its present
mode. When any command other than a resend is
received by the controller, it will clear its motion and
displacement counters.
The host system may send a Resend command to the
controller if an error is detected in a transmission from
the controller. When the controller receives a Resend
command, it will retransmit the last data packet
transmitted. If the last packet transmit was a resend
command, the packet prior to the last packet will be
retransmitted.
3.1.3
SET DEFAULT
CODE: FEH
The Set Default command re-initializes all controller
parameters to the power-up state. The controller
initializes the following status registers, which only exist
to ensure compatibility.
This command does not initiate self test diagnostics.
The controller
remains in the disabled state until
another command is received from the host.
3.1.4
DISABLE REPORTING
CODE: F5H
The Disable
Reporting command prevents data
transmission by the controller while it is in the Stream
Mode. However, the controller will still respond to other
commands. When reporting is disabled, Stream Mode
must be disabled prior to the host sending a command
that requires a response by the controller.
3.1.5
ENABLE REPORTING
CODE: F4H
The Enable Reporting command allows the controller
to transmit data when in Stream Mode. This command
has no effect while the controller is in Remote Mode.
3.1.6
SET REPORT RATE
CODE: F3H, XXH
This command updates the report rate status register
with the data contained in the second byte of the
command. However, the actual report rate remains
fixed at 40 times per second. This command only exists
to ensure compatibility.
3.1.7
READ DEVICE TYPE
CODE: F2H
The controller always transmits a 00h in response to
receiving this command. This informs the host that a
standard mouse is present.
Report rate:
100 reports per second
Scaling:
Linear
Mode:
Streaming
Resolution:
Physical resolution
Reporting:
Disabled
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