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How is 8255 (Programmable Peripheral Interface) configured if its control registercomprises 9B h.
Ans
9BH => 1001 1011 =>
b6b5=00-> Mode0
b4=0-> Port A as input.
b3=1-> Port C as input (PC7-PC4)
b2=0-> Mode 0
b1=1-> Port B as input
b0=1-> Port C as input (PC3-PC0).
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