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12F675 Comparator

 
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BLL



Joined: 11 Nov 2006
Posts: 181
Location: Birmingham, UK

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12F675 Comparator
PostPosted: Fri Mar 15, 2019 1:55 pm     Reply with quote
Hi, I am looking to use the comparator in the 12F675, but I have never used one in a PIC before. I can see the 2 inputs and I understand how comparators work, but nowhere can I find out how to read, programmatically the output state of the comparator. The example provided by CCS is of no use!
How does one read it please?

Thanks

Brian
temtronic



Joined: 01 Jul 2010
Posts: 9246
Location: Greensville,Ontario

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PostPosted: Fri Mar 15, 2019 2:09 pm     Reply with quote
you test bit6(COUT) of the CMON register. It's 1st page of chapter 6..comparator. Now the output bit value depends upon the configuration you setup...kinda tricky so pen and paper and truthtable will help !

Jay
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Fri Mar 15, 2019 3:24 pm     Reply with quote
Here is a test program using the comparator for the 12F683.
This PIC is very similar to the 12F675. You should be able
to use the same program. It does everything you want to do:
http://www.ccsinfo.com/forum/viewtopic.php?t=42946&start=1
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