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Subject: PortA, RA4 and TMR0 conflict in PIC16F84 ?

Date: 08/01/02 at 12:14 PM
Posted by: Archaven
E-mail: dannytan88@yahoo.com
Message Posted:

Hi all. I would like to know if there's a conflict between PortA RA4 and TMR0?I have written a program that delays for 5 seconds using TMR0 Interrupt. As far as I know, PortA, RA4 can be configure to be normal I/O OR external clock interrupt.However, my application does not need external clock interrupt. What I need to do is just execute a delay using TMR0. By setting the TOCS, I found that RA4 is not usable.As what I know, IF i used the RA4 as EXTERNAL INPUT, then I cannot used it as an I/O.But now IF i used TMR0 by selecting TOCS, RA4 is unusable not usable. Is there anything wrong? Thanks.

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