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'[PIC]: Can't write to RE3 on 17C756A'
2002\10\18@060427 by Graham North

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Hi, everyone,

Even though I have RE3 set as an output, I can't write to it. The value in
ddre is 0x00, but when I try to write 0x0F to port e, it only sets the
bottom three bits!

Is this anything to do with RE3 being a Schmitt Trigger Capture pin?

Thanks

Graham

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2002\10\18@060826 by c Scheepers

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I do not have a 17CXXX but had the same type of problems with my 16F877 until I found that PORTE was setup by default as ANALOG and you have to set it up first as digital before using it!!

{Original Message removed}

2002\10\18@061954 by Graham North

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Is this true on a 17CXXX? I thought port F was Analogue. I have set that as
digital I/O. I have no problems writing to that port.

Graham


<I do not have a 17CXXX but had the same type of problems with my 16F877
until I found that PORTE was setup by default as ANALOG and you have to set
it up first as digital before using it!!>



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part 3 105 bytes
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2002\10\18@062648 by Jan-Erik Soderholm

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"Thought" ??

And what does the Data Sheet "think" about it ??

:-)

Jan-Erik.


>Is this true on a 17CXXX? I thought port F was Analogue. I have set that as
>digital I/O. I have no problems writing to that port.
>
>Graham



Jan-Erik Svderholm
S:t Anna Data
tel : +46 121 42161
mob : +46 70 5241690

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2002\10\18@084159 by Olin Lathrop

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> Even though I have RE3 set as an output, I can't write to it. The value in
> ddre is 0x00, but when I try to write 0x0F to port e, it only sets the
> bottom three bits!
>
> Is this anything to do with RE3 being a Schmitt Trigger Capture pin?

Whenever you see something like this, check what peripherals might use that
pin.  RE3 is also a capture input.  I haven't checked in this case, but
sometimes peripherals will override the direction setting when enabled.


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