## How is 8255 (programmable peripheral interface) configured, Electrical Engineering

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How is 8255 (Programmable Peripheral Interface) configured if its control register contains 9B h.

Ans. Programmable Peripheral Interface

Command Byte B (sets or resets any bits in port C) BH => 1001 1011 =>

6b5=00-> Mode0

4=0-> Port A as input

3=1-> Port C as input (PC7-PC4)

2=0-> Mode 0

1=1-> Port B as input

0=1-> Port C as input (PC3-PC0).

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