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About connecting 8255 with 8051 microcontroller

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sangmeshwar

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Please give me information about how will i connect 8255 with 8051 microcontroller? I want to connect 10 8255 with only one microcontroller.
 

On the attached picture you will find an example on how to connect 1x 8255 to 8051 microcontroller ..
If you plan to connect 10 (or up to 16) of them to one 8051 you will need to sort out the control of the CS pins and this can be accomplished by introducing 4-to-16 (74HC154) decoder, connecting its inputs (A, B, C and D) to A15, A14, A13 and A12 and its output(n) to CS pin of 8255(n) ..

So, digest what I have suggested so far and if you have more questions, simply come back and ask ..

Regards,
IanP
 
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    hamraz

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I have found that it is cheaper to buy 8051's than 8255. So I just link multiple 8051's together with the serial ports :)
 

there if u need i/o then ispite of using 8051 with 8255 it is better to use another uc with large number of i/o like pic16f876 or so
 

can some one explain me or send a "C" program that can work with keil , for 8255 port extension with 89c51.

thanks .
 

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