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the different operating modes of 8255 are as follows

1)bsr mode

2)i/o mode

-bsr mode can only program using port c and is used when d7=0 in control word

-i/o mode can be used for all ports a,b,c(upp),c(low) respectively and is used when d7=1

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Q: What are the different operating modes of 8255?
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