Electronics and Communication Engineering - Exam Questions Papers - Discussion
Discussion Forum : Exam Questions Papers - Exam Paper 12 (Q.No. 20)
20.
In 8085 microprocessor based system running at 3 MHz clock frequency what should be the minimum pulse width of the INTR signal, so that it is recognized successfully?
Answer: Option
Explanation:
T = 
x 106 = 0.333 μs
8085 checks INTR, one clock period before the last T-state of an instruction cycle. In 8085, CALL instruction requires 18 T-states.
∴ INTR pulse should be high at least for 17.5 T-states
i.e. for 17.5 x 0.33 x 10-6 = 5.8 μs long.
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