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Subject: QuasiDirectional Ioports in 80hc196 microcontroller

Date: 03/06/03 at 7:28 PM
Posted by: George Gekas
E-mail: gekas@ceid.upatras.gr
Message Posted:

Hello everybody,
I am a student in Computer Engineering and Science and i would like an answer to my problem. How can i program a quasi-directional port in a 80196 Intel microcontroller (such as IOPORT1). Since there is no directional register for the programming of such a port how can i toggle between modes of io operations? I have the impression that if i want to use a port's pin as an input i must write a 1 to it before i use it and if i want to use it as an output i must write a 0 to it before i use it. I really need's somebody's help on this because i have a project based on that microcontroller!

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