GATE | GATE-CS-2000 | Question 9

The 8085 microprocessor responds to the presence of an interrupt
(A) As soon as the TRAP pin becomes ‘high’

(B) By checking the TRAP pin for ‘high’ status at the end of each instruction fetch
(C) By checking the TRAP pin for ‘high’ status at the end of the execution of each instruction
(D) By Checking the TRAP pin for ‘high’ status at regular intervals


Answer: (C)

Explanation: Explanation:

The microprocessor recognizes interrupt request on request lines(RST7.5,RST 5.5,RST 6.5,TRAP,INTR) at the end of current instruction execution.



TRAP is non maskable interrupt .TRAP is active high ,level,edge triggered non maskable highest priority interrupt.when TRAP line is active microprocessor insert intervals restarts automatically at vector location of TRAP.

So correct option is (C).

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