參數(shù)資料
型號： MC68HC708MP16
廠商： Motorola, Inc.
英文描述： 8-Bit Microcontroller Units (MCU).(8位微控制器)
中文描述： 8位微控制器單元（MCU）。（8位微控制器）
文件頁數(shù)： 34/44頁
文件大小： 342K
代理商： MC68HC708MP16
Application Note
AN1712
34
MOTOROLA
Encoder
Processing
With careful software design and moderate shaft speeds, encoder
signals can be decoded directly by the 'MP16 timers. In fact, Motorola
already is working on a software solution for this. For more demanding
applications, however, external hardware is required to process the
encoder signals, as shown in
Figure 17
. The circuitry shown decodes
encoder channel information into a count clock and an up/down signal
[4]
.
Each new encoder position results in a count of the timer A counter. Any
change in the direction of rotation will cause an optional interrupt and a
capture of the timer A value corresponding to the first encoder count in
the opposite direction. Since the timer A counter only counts up, the
software is responsible for integrating the direction information when
calculating the encoder position.
Figure 20
shows the timing
relationships for the encoder processing circuitry.
Figure 20. Encoder Processing Waveforms
N+4
TCH0B
TCH2B
TCH1B
TCH3B
CHANNEL A
CHANNEL B
74HC86
A OUTPUT
74HC86
C OUTPUT
UP/DOWN
74HC86
B OUTPUT
TIMER
COUNT
POSITION
CAPTURED
VALUE
N
N+8
N+9
N+8
N+7
N+6
N+5
N+4
N+3
N+1
N+2
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
10
LAST VALUE OF DIRECTION CHANGE
N+1
N+2
N+3
N+5
N+6
N+7
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