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Edge triggering in PIC

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LAN_403

TheMerovingian

Thu Oct 21 2010, 09:34PM

Registered Member #14 Joined: Thu Feb 02 2006, 01:04PM
Location: Prato/italy
Posts: 383

When i'm using the edge triggering in PICs what is the minimun voltage swing needed for detection. I could not find anything about that

Lethal Shot

Fri Oct 22 2010, 10:25AM

Registered Member #1623 Joined: Tue Aug 05 2008, 03:31PM
Location: The Netherlands
Posts: 39

It depends on which PIC your using and if the ports are TTL or smith triggered.
For a PIC18F4550 the values are:
Low threshold 0.8V (TTL) and 0.2*VDD (smith trigger) assuming supply voltage is 4.5V or more.
High threshold is 2.0V and 0.8*VDD respectively.
But to be sure check the datasheet under 'Electrical characteristics' and then 'DC characteristics'.

TheMerovingian

Fri Oct 22 2010, 07:15PM

Registered Member #14 Joined: Thu Feb 02 2006, 01:04PM
Location: Prato/italy
Posts: 383

thank you :D. So the threshould in edge mode are the same. Perfect!

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