Solution for End Term Examination 2019 1(a) Is there some minimum pulse width required for the INTR signal in case of 8085 microprocessor? Explain with reason.          3 Solution: Assuming 8085 microprocessor based system running at 3 MHz clock frequency T = 1/3 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 So, minimum pulse width of the INTR signal to be recognized successfully = 17.5 x 0.33 x 10-6 = 5.8 μs long. Q1.b  Explain how many time the following loop will be executed                                                 3 LXI B, 000Bh Loop :             DCX B JNZ Loop Answer: LXI instruction loads the register pair BC with 000B which