A microprocessor scans the status of an output I/O device every 20 ms. This is accom- plished 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. How long does it take to scan and service the device given a clocking rate of 8 MHz? Assume for sim- plicity that all pertinent instruction cycles take 12 clock cycles.
A microprocessor scans the status of an output I/O device every 20 ms. This is accom- plished 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. How long does it take to scan and service the device given a clocking rate of 8 MHz? Assume for sim- plicity that all pertinent instruction cycles take 12 clock cycles.
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
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![A microprocessor scans the status of an output I/O device every 20 ms. This is accom-
plished 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. How long does it
take to scan and service the device given a clocking rate of 8 MHz? Assume for sim-
plicity that all pertinent instruction cycles take 12 clock cycles.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fd55b500a-a06f-433a-9664-2327b6518372%2F486a7687-534c-4311-b678-1ccb64644734%2Fyvi1rd_processed.jpeg&w=3840&q=75)
Transcribed Image Text:A microprocessor scans the status of an output I/O device every 20 ms. This is accom-
plished 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. How long does it
take to scan and service the device given a clocking rate of 8 MHz? Assume for sim-
plicity that all pertinent instruction cycles take 12 clock cycles.
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