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how to configure a port as i/p or o/p.

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vikrant

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hi friends,

I want to know how to make a port as i/p or o/p.

its fine that we have to configure the port before using but what is the logic behind assigning values 00H or FFH to make a port as i/p or o/p.

I am using a 245 buffer which is interfaced with Port 0 of at89s52 , now this buffer IC has one pin DIR which set the direction of data flow through these port pins. Now if suppose i will make port 0 as i/p port and DIR is set such that data has to go out from the port ,will this situation creates any problem?
 

polymath

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Hi vikrant

What mode are you using PORT0 in?
Are you using it for I/O or for multiplexed address/data?

Polymath
 

    vikrant

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