GATE | GATE CS 1997 | Question 51

A D flip-flop is to be connected to an 8085 microprocessor chip as a 1-bit output port with a port address of FF hex. Data bit D3 should be involved in the data transfer from CPU to the flip-flop. The flip-flop should be cleared on power ON.

  • a. Using only one NAND gate (fan in of 10), one NOT gate and one D flip-flop. Draw the required interface logic circuit (only the relevant signals should be shown).
  • b. Write a program to generate a square wave on the output of the flip-flop. ON and OFF periods of the square wave should be 7 bus cycles each.



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