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Question

Why MOVX instruction is being used to access the ports of the 8255?

a.

because 8255 is used to access the memory mapped I/O

b.

because 8255 is used to access the external communication

c.

because 8255 is used to access the data transfer

d.

because 8255 is used to access the interfacing of LCD, motor etc.

Posted under Computer Architecture

Answer: (a).because 8255 is used to access the memory mapped I/O

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Q. Why MOVX instruction is being used to access the ports of the 8255?
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