Post by thread:16C84/16F84 RA4 port Behavior

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.mantouxTakeThisOuTbull.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]

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