Explanation: CS, A0, A1 all are used to select the ports and the control register of 8255. 5. What is the value of the control register when RESET button is set to zero?
A. 0x00H
B. 0xFFH
C. 0x11H
D. value remains the same as was before the RESET button was set to zero
Answer:A
Explanation: CS, A0, A1 all are used to select the ports and the control register of 8255. 5. What is the value of the control register when RESET button is set to zero?
A. 0x00H B. 0xFFH C. 0x11H D. value remains the same as was before the RESET button was set to zero
Explanation: RESET button makes the value of the control register clear if an active high pulse is applied to it. So for clearing the control register RESET button should be set to 1.