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using port A4 as digital output.

 
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Nick
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using port A4 as digital output.
PostPosted: Fri Jan 21, 2005 11:49 am     Reply with quote
I have one analog port setup A0 and I'm trying to using A4 as digital output. Is there anything that I have to do special to make it a digital output?

Thanks,
Nick
Mark



Joined: 07 Sep 2003
Posts: 2838
Location: Atlanta, GA

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PostPosted: Fri Jan 21, 2005 12:45 pm     Reply with quote
You don't specify what PIC you are using, but RA4 on most pics can only sink current. It is an open drain pin. That means that it cannot output a voltage but can pull the voltage to 0 volts. If you want to use it as an output, then you will have to add a pullup to 5V through a resistor.
rwyoung



Joined: 12 Nov 2003
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Location: Lawrence, KS USA

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PostPosted: Fri Jan 21, 2005 1:13 pm     Reply with quote
Nick -

Google for "open drain" and also consult the data sheet for the PIC you are using.
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Nick
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PostPosted: Fri Jan 21, 2005 7:05 pm     Reply with quote
yall are correct, thanks guys!

Nick
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