Question

A microprocessor scans the status of an output I/O device every 20 ms. This is accomplished by means of a timer alerting the processor every 20 ms. The interface of the device includes two ports: one for status and one for data output. Calculate the time taken to take to scan and service the device given a clocking rate of 4 MHz? Assume for simplicity that all instruction cycles take 12 clock cycles.

Answer 1

Answer:

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