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Clock declaration?!!

 
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doryme



Joined: 16 Oct 2010
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Clock declaration?!!
PostPosted: Mon Oct 18, 2010 3:46 pm     Reply with quote
Hello
I am using pic16f877A. I don't understand what to write in declaration to define my 10MHz crystal.
Should I write #USE DELAY (CLOCK=10000000)??

Also I don't understand what are fuses?!
PCM programmer



Joined: 06 Sep 2003
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PostPosted: Mon Oct 18, 2010 4:03 pm     Reply with quote
There is a tutorial that explains all your questions. It's about 1/2 way down
the page on the following link. Look for the section called "Sample Code".
He explains a small program line-by-line:
http://harfordhackerspace.org/2010/02/programming-pic-microcontrollers-in-c/
doryme



Joined: 16 Oct 2010
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PostPosted: Mon Oct 18, 2010 4:16 pm     Reply with quote
PCM programmer wrote:
There is a tutorial that explains all your questions. It's about 1/2 way down
the page on the following link. Look for the section called "Sample Code".
He explains a small program line-by-line:
http://harfordhackerspace.org/2010/02/programming-pic-microcontrollers-in-c/


Thanks alot for this link..it is very useful!
but i know now that i use INTRC_IO fuse when i use internal oscillator, what should i write when i use external one?!
bkamen



Joined: 07 Jan 2004
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Location: Central Illinois, USA

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PostPosted: Mon Oct 18, 2010 4:22 pm     Reply with quote
doryme wrote:
PCM programmer wrote:
There is a tutorial that explains all your questions. It's about 1/2 way down
the page on the following link. Look for the section called "Sample Code".
He explains a small program line-by-line:
http://harfordhackerspace.org/2010/02/programming-pic-microcontrollers-in-c/


Thanks alot for this link..it is very useful!
but i know now that i use INTRC_IO fuse when i use internal oscillator, what should i write when i use external one?!


You will probably want either HS (depends on the PIC).

You want to read the datasheet for the device.

-Ben
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Dazed and confused? I don't think so. Just "plain lost" will do. :D
Humberto



Joined: 08 Sep 2003
Posts: 1215
Location: Buenos Aires, La Reina del Plata

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PostPosted: Mon Oct 18, 2010 4:29 pm     Reply with quote
Quote:

but i know now that i use INTRC_IO fuse when i use internal oscillator, what should i write when i use external one?!


You can find a short explanation to understand the FUSES meaning in:
http://www.ccsinfo.com/forum/viewtopic.php?t=24336&highlight=fuses

Regards
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