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參數(shù)資料
| 型號： | MTA41110/P |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | SPECIALTY MICROPROCESSOR CIRCUIT, PDIP18 |
| 封裝： | 0.300 INCH, PLASTIC, DIP-18 |
| 文件頁數(shù)： | 18/24頁 |
| 文件大?。?/td> | 377K |
| 代理商： | MTA41110/P |
1995 Microchip Technology Inc.
DS40103C-page 3
MTA41110
1.0
PIN DESCRIPTIONS
PIN NAME
TYPE
DESCRIPTION
NC
No Connect
This pin should be left unconnected
QDRV
Output
Active high strobed encoder drive
HOR1
Input
Horizontal quadrature input #1
HOR2
Input
Horizontal quadrature input #2
PBTN
Input
Primary mouse button. Active low , 0 = button depressed
ABTN
Input
Alternate mouse button. Active low, 0 = button depressed
DBTN
Input
Optional trackball drag lock button. Active low, 0 = button depressed. For
mouse operation connect this pin to VDD
VERT1
Input
Vertical quadrature input #1
VERT2
Input
Vertical quadrature input #2
DLED
Output
Optional trackball drag LED. For mouse operation this pin is a no connect and
should be left unconnected
OSC1
Input
4 MHz crystal or ceramic resonator connection
OSC2
Output
4 MHz crystal or ceramic resonator connection
CLK
Input
PS/2 data clock input
MCLR
Input
A “l(fā)ow” voltage on this pin causes a reset condition for the MTA41110
controller
VDD
Pwr
+5V
VSS
Pwr
Ground
2.0
OPERATION
Upon power-up, the MTA41110 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 condi-
tion. Finally, if the MTA41110 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 MTA41110 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 MTA41110
discards the complete command. The MTA41110 is
then ready to receive and acknowledge the next
command. Two exceptions to the acknowledge after
command received rule exist. The MTA41110 does not
issue an acknowledge upon receipt of either the Set
Wrap Mode (EEh) or Resend (FEh) commands.
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