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Using RA5/MCLR' as input PIC16F88

 
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skoberlink



Joined: 27 May 2010
Posts: 52

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Using RA5/MCLR' as input PIC16F88
PostPosted: Thu May 27, 2010 1:04 pm     Reply with quote
I'm using the PIC16F88 and need to read an input from RA5. I have the fuse NOMCLR which should turn the pin to digital input. I have TRISA and ANSEL set (even though I don't think they affect RA5). Despite all this I'm not reading a high on RA5 when I'm supposed to be. I'm relatively new to embedded systems in general and wondered if maybe I missed another fuse or something. Any suggestions?
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Thu May 27, 2010 1:36 pm     Reply with quote
Post a compilable test program that shows how you're reading the pin.
The program should have the #include for the PIC, #fuses statement,
and #use delay, etc. It should also have a main(), and show all variable
declarations, if needed, and should compile with no errors. Example:
http://www.ccsinfo.com/forum/viewtopic.php?t=38057&start=1

Also post a description or schematic of the external circuits connected to the PIC pin. Example:
Code:

                   +5v 
                    |
                    > 
               4.7K <          push button
            pullup  >          switch
                    |          ----
PIC pin ------------o----------o  o-----
                                       |
                                     -----  Ground
                                      ---
                                       -
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