stack instructions, Basic Computer Science

Assignment Help:
These instructions permit the use of the stack to store or recover data.
POP
POPF
PUSH
PUSHF

POP INSTRUCTION
Purpose: It improves a portion of information from the stack
POPF INSTRUCTION
Purpose: It extracts the flags stored on the stack
POPF
This command moves bits of the word stored on the superior part of the stack to the flag register.
PUSH INSTRUCTION
Purpose: It puts a word on the stack.
Syntax:
PUSH source
The PUSH instruction reduces by two the value of SP and then transfers the data of the source operator to the new resulting address on the just modified register.
The decrement on the address is due to the fact that when adding values to the stack, this one raises from the greater to the smaller segment address, consequently by subtracting 2 from the SP register what we do is to raise the size of the stack by two bytes, which is the only amount of information the stack can handle on every input and output of information.
PUSHF INSTRUCTION
Purpose: It situates the value of the flags on the stack.
Syntax:
PUSHF
This command reduces by 2 the value of the SP register and then the content of the flag register is relocated to the stack, on the address indicated by SP.
The flags are gone stored in memory on the similar bits indicated on the POPF command.

Related Discussions:- stack instructions

Multithread 1:1 Model, Given an operating system that supports a one – to ...

Given an operating system that supports a one – to –one relationship between user-level threads and kernel – level threads and allows one or more threads from a process to issue b

The microprocessor, THE MICROPROCESSOR The three fundamental units, whi...

THE MICROPROCESSOR The three fundamental units, which comprise a CPU, have now been discussed in general terms.  So too has a microprocessor, because a microprocessor can be de

Flowcharting, Flowcharting: Flowcharting: A Flowchart is a graphical r...

Flowcharting: Flowcharting: A Flowchart is a graphical representation of an algorithm. It can be compared to the blueprint of a building. Just as a building contractor refers

Computer as a data processor, Computer as a Data Processor: The main f...

Computer as a Data Processor: The main function of a computer is to process the input data according to a specific program to produce the desired output. This is the reason wh

COMPUTER, DUNIYA KA AISA KONSA KOMPUTER HAI. JISME KEYBORD, MOUSE NAHI HAI?...

DUNIYA KA AISA KONSA KOMPUTER HAI. JISME KEYBORD, MOUSE NAHI HAI?

In-door patient department, In-door Patient Department Ideally all ...

In-door Patient Department Ideally all features of OPD.  Both OPD and IPD modules should be inter-linked.  In addition all details pertaining to the patient's medica

Cai, What is CAI? Explain its pitfalls.

What is CAI? Explain its pitfalls.

Education and society, mention the aims of education in present scenario

mention the aims of education in present scenario

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