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'OCx fast' in One-pulse mode

Question asked by diverger on Aug 31, 2017
Latest reply on Sep 1, 2017 by waclawek.jan

I'm using STM32F429x. I'm confused by the 'OCx fast' setting when using the 'One-pulse mode' of the timer. In DM00031020 section 17.3.15, it states:

 

In One-pulse mode, the edge detection on TIx input set the CEN bit which enables the
counter. Then the comparison between the counter and the compare value makes the
output toggle. But several clock cycles are needed for these operations and it limits the
minimum delay tDELAY min we can get.

 

"But several clock cycles are needed for these operations...., it limits the minimum delay tDELAY min we can get", I think it means if we don't enable OCx fast setting, we will get a delay. However, I don't understand where the delay will appear in the figure above?

 

Anyone can explain the situation more clearly? What we can benefit from enabling ‘OCx fast'???? 

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