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'16C84/16F84 RA4 port Behavior'
1999\03\12@023436 by Gerard Mantoux

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I come again to you PIC experts.
AFAK, port RA4 on 16X84 can be used in three ways:
    - Normal Input
    - Normal Out (With an Open Drain transistor, that needs a pull up
resistor)
    - Clock Input for the Timer / prescaler.
When I analyse the schematics on the Data Sheet, It seems to me that the
Clock Input circuitry is fully independent from the I/O one.
My question is :
Is it possible to use simultaneously and independently (Without any
software problem) :
    -Clock input for the Timer / Prescaler
    -AND Open Drain Output

I want to "OR-Ty" an external open collector circuit and RA4 Open Drain
Output, and to send the result to prescaler input. That saves 1 pin.
Many Thanks in Advance,
Regards

[Gerard Mantoux                         email: spam_OUTgerard.mantouxTakeThisOuTspambull.net
Bull S.A.   38, Route de Versailles      tel: (33) 01 39 66 50 90
78430 LOUVECIENNES, France              fax: (33) 01 39 66 67 94
OPINIONS ARE MY OWN & DO NOT NECESSARILY REFLECT BULL POLICIES]

1999\03\12@025759 by Gerhard Fiedler

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At 08:32 03/12/99 +0100, Gerard Mantoux wrote:
>Is it possible to use simultaneously and independently (Without any
>software problem) :
>     -Clock input for the Timer / Prescaler
>     -AND Open Drain Output

since all input reads always read the pin state independently whether the
pin is an output or a (digital) input, it should work. but i guess someone
has to try it :)

ge

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