Question

If the pin LOCK (active low based) is low at the trailing edge of the first ALE pulse, then till the start of the next machine cycle, the pin LOCK (active low) is

(a) low

(b) high

(c) low or high

(d) none of the mentioned

This question was posed to me in a national level competition.

My query is from Non Maskable Interrupt and Maskable Interrupt (INTR) topic in chapter Special Architectural Features and Related Programming of Microprocessor

Answer 1

Correct choice is (a) low

Explanation: The pin LOCK (active low) remains low till the start of the next machine cycle.