Describe real and protected mode, Computer Engineering

Assignment Help:

Describe Real and protected mode:

Operation of Real mode interrupt:  When microprocessor completes executing the current instruction, it concludes whether an interrupt is active by checking (1) instruction execution, (2) single -step, (3) NMI, (4) co-processor segment overrun, (5) INTR and (6) INT instruction in the order presented. If one or more of these interrupt conditions are present, following sequence of events takes place:

1.  Contents of the flag register are pushed onto the stack

2.  Both the interrupt (IF) and trap (TF) flags are cleared. This disables INTR pin and trap or single-step feature.

3.  Contents of the code segment register (CS) are pushed onto the stack.

4.  Contents of the instruction pointer (IP) are pushed onto the stack.

5.  The interrupt vector contents are fetched and then placed into both CS and IP so that the subsequent instruction executes at the interrupt service procedure addressed by the vector.

 


Related Discussions:- Describe real and protected mode

Determine the order in which optimized c-scan would service, Consider the s...

Consider the situation in which the disk read/write head is currently located at track 45 (of tracks 0-255) and moving in the positive direction. Assume that the following track re

binary division program for signed integer, The program division.c is avai...

The program division.c is available for download as part of this assignment. It is a binary division program which works for signed integers. It contains a function, div32, which d

What is basic analog design, What is basic Analog Design? Analog design...

What is basic Analog Design? Analog design is rather challenging than digital design as analog circuits are sensitive to noise, operating voltages, loading circumstances and ot

What are different adder circuits you studied, Half Adder (for addition of ...

Half Adder (for addition of two bits) Full Adder (for addition of three bits) Carry look ahead adder Carry save adder Carry propagate adder

Indian standard code for information interchange, The ISCII is an 8-bit cod...

The ISCII is an 8-bit code which contains standard ASCII values till 127 from 128-225 it contains characters necessary in ten Brahmi-based Indian scripts. It is defined in IS 13194

Explain analysis and synthesis phase of a compiler, Explain analysis and sy...

Explain analysis and synthesis phase of a compiler. The synthesis and analysis phases of a compiler are: Analysis Phase: In this breaks the source program in constituent

Graphics, what is bitmap and pixmap

what is bitmap and pixmap

Non-repudiation achieved in designing e-cash based system, How can non-repu...

How can non-repudiation be achieved into designing e-cash based system? E-cash is fundamentally an online solution. The buyer should validate the coins by the issuer so as to g

Explain serial execution and parallel execution, Serial Execution Exe...

Serial Execution Execution of a program serially, one statement at one instance of time. In the simplest case, that's what takes place on a one processor machine. But even mo

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd