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參數(shù)資料
| 型號(hào)： | MTA41300/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)： | 27/28頁 |
| 文件大?。?/td> | 466K |
| 代理商： | MTA41300/P |
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MTA41300
DS40101C-page 8
1995 Microchip Technology Inc.
4.0
MOTION ENCODER INPUTS
The MTA41300 is designed to interface with either opti-
cal encoders that utilized LED and phototransistor pairs
with a chopper wheel, or mechanical encoders utilizing
a commutator with wiper contacts. The HOR and VERT
inputs detect positive and negative delta motion.
Motion direction is defined in the following state table.
Refer to Figure 4-1 and Figure 4-2.
Positive Motion:
Hor1, Hor2/
Vert1,Vert2
Description
0,0
0,1
1,1
Positive Direction
1,0
Sequence
0,0
etc.
Negative Motion:
Hor1, Hor2/
Vert1,Vert2
Description
0,0
1,0
1,1
Negative Direction
0,1
Sequence
0,0
etc.
The
HOR
and
VERT
inputs
are
sampled
at
approximately 12000 samples per second with a
4 MHz input clock. The sample rate will decrease when
communication traffic to or from the host is occurring.
There is a one to one correlation between encoder
transitions and the motion data that is transmitted to the
host. For example, a transition of 0,1 to 1,1 on the
horizontal encoder inputs (HOR1, HOR2) will result in
one bit of horizontal motion as broadcast to the host.
The sample rate, along with all other timed events
related to the controller, is directly proportional to the
clock frequency on the OSC1 and OSC2 pins.
An anti-jitter algorithm is employed to eliminate false
motion counting when the mouse or trackball is not
moving. This is especially useful in designs employing
optical encoders since the output of an optical detector
is an analog signal. The anti-jitter algorithm eliminates
false counting when a voltage that is not a well defined
logic low or logic highs applied to either the HOR or
VERT inputs.
FIGURE 4-1:
POSITIVE MOTION INPUT
FIGURE 4-2:
NEGATIVE MOTION INPUT
HOR1 or VERT1
HOR2 or VERT2
HOR1 or VERT1
HOR2 or VERT2
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