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ST9 데이터시트(PDF) 83 Page - STMicroelectronics

부품명 ST9
상세설명  USER GUIDE
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ST9 데이터시트(HTML) 83 Page - STMicroelectronics

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ST9 USER GUIDE
that are symmetrically centred on half of the reload value. For example, if the reload value is
255, the compare registers are set to the following values:
You need to ensure that the compare registers are not written while they are used for a com-
parison. Because of this, they are written in an interrupt service routine that is triggered by the
MFT itself. To allow maximum latency time, the interrupt is triggered either by a compare 0 or
a compare 1 event, according to the value of the duty cycle. For duty cycles between 0 and
50%, the compare 0 event is used. Between 50% and 100%, the compare 1 event is used.
The following figures shows the timing diagram.
Figure 44
. Output A Timing
Duty Cycle
Compare Register 0
Compare Register 1
10%
115
140
25%
96
159
50%
64
191
75%
32
223
90%
13
242
Output A
Reload
Value
Compare
Register 1
Value
Compare
Register 0
Value
Reload
Interrupt



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