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time required for fast_io ports to switch between input and

 
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cmccabe
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time required for fast_io ports to switch between input and
PostPosted: Tue Jun 17, 2003 3:15 pm     Reply with quote

Hi, I'm using PCM on a PIC16F877. I'm trying to get fast_io to work with port c.<p>
Does anyone know what the minimum time required to shift from output to input is? I am emulating a bidirectional bus.<p>
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Sherpa Doug
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Re: time required for fast_io ports to switch between input
PostPosted: Tue Jun 17, 2003 3:30 pm     Reply with quote

:=Hi, I'm using PCM on a PIC16F877. I'm trying to get fast_io to work with port c.<p>
:=Does anyone know what the minimum time required to shift from output to input is? I am emulating a bidirectional bus.<p>

Probably about the time it takes for two opcodes or Xtal speed/8. It is just the time to write a new value to the tristate register. Write a trivial program, compile it and look at the list file.

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