Purchase Solution

Time taken to get the status and service the I/O device

Not what you're looking for?

Ask Custom Question

Timer alerts processor for a status scan of I/O device every 20 ms. I/O device interface has two 8-bit ports: status and data output.
Compute the time it takes to get the status and service the device, with an 8-MHz processor clock rate. All instructions take 12 clock cycles.
State your assumptions, if any.

Purchase this Solution

Solution Summary

As nothing is mentioned about the activity during servicing the device, it is assumed that the processor simply reads out the 8 bit data from the data output port of the device, when servicing it.

Solution Preview

As nothing is mentioned about the instructions executed during servicing the device, we assume that the processor simply reads the 8 bit data from the data output port of the device, in the name of ...

Purchase this Solution


Free BrainMass Quizzes
Javscript Basics

Quiz on basics of javascript programming language.

C# variables and classes

This quiz contains questions about C# classes and variables.

Word 2010: Tables

Have you never worked with Tables in Word 2010? Maybe it has been a while since you have used a Table in Word and you need to brush up on your skills. Several keywords and popular options are discussed as you go through this quiz.

Basic Computer Terms

We use many basic terms like bit, pixel in our usual conversations about computers. Are we aware of what these mean? This little quiz is an attempt towards discovering that.

Basic UNIX commands

Use this quiz to check your knowledge of a few common UNIX commands. The quiz covers some of the most essential UNIX commands and their basic usage. If you can pass this quiz then you are clearly on your way to becoming an effective UNIX command line user.