Constant pulse with pic18f1220

andresteff · Joined: 21 Mar 2020 Posts: 44

I want to read in a pulse of variable width with a Pic18F1220, and output it to a 50us pulse. Can I do this with capture or compare?

dyeatman · Joined: 06 Sep 2003 Posts: 1933 Location: Norman, OK

Using Search I found one good place to start:
http://www.ccsinfo.com/forum/viewtopic.php?t=60024&highlight=pulse+width
It has a couple of good references also.
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Ttelmah · Joined: 11 Mar 2010 Posts: 19496

I think what you want is to simply have a 50uSec pulse triggered by probably
the rising edge of the 'variable' pulse.
Look in the CCP data sheet at 'special event trigger' mode. What you do
is have one CCP set to this mode that resets a timer. Then have a second
CCP to generate a fixed width pulse from this timer.
When the timer resets, the second CCP generates the pulse.