Question

how to on off led by 8085 microprocessor ​

Answer 1

Answer:

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Group A and B will operate in mode 0.

Using port A as input port and port B as output port. The operation mode of port C is immaterial, as it will not be used here. Here the operation mode of port C is considered as input.

Thus setting the control word as (10011001)

Therefore the control word is 99 H.