Question

counters and time delay
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Answer 1

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COUNTERS ARE USED TO KEEP TRACK OF EVENTS.  TIME DELAYS ARE IMPORTANT IN SETTING UP REASONABLY ACCURATE TIMING BETWEEN TWO EVENTS. COUNTERS A Counter is designed simply by loading an appropriate number into one of the registers and using the INR (Increment by one) or the DCR (Decrement by one) instructions.

Answer 2

A counter actually counts the number of input pulses, and involves digital logic.

A time delay can be a purely analog device, such as the famous 555 timer, or can be implemented digitally.