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

Transaction-based model, Transaction-based model: Here,  the pricing i...

Transaction-based model: Here,  the pricing is based on providing a committed business service, for ex, processing payroll for a global company as part of HR offering and this

Explain digital multiplexers, Problem 1 Perform the following conversio...

Problem 1 Perform the following conversion a. (ABE) 16 =() 2 b. (101011) 2 =() 10 2 Explain how full adder adds three bits 3 Explain digital multiplexers

Wcdma – fdd technology, WCDMA – FDD technology Multiple access technology i...

WCDMA – FDD technology Multiple access technology is wideband CDMA (WCDMA) All cells at same carrier frequency Spreading codes used to separate cells and users Signal bandwidth 3.8

Bootstrap loader, Bootstrap loader: The critical programs are loaded i...

Bootstrap loader: The critical programs are loaded into memory by the bootstrap loader at start-up time and will remain resident as long as the computer is running. The bootst

What is the importance of using digital certificates, QUESTION a) Crypt...

QUESTION a) Cryptography is a set of techniques and mathematical algorithms. Describe four important areas where cryptography must be applied b) What is the importance of us

Outdoor patient department features - receptionist module, Outdoor Patient...

Outdoor Patient Department (OPD) Features The following modules can be developed for various areas and workers. A receptionist Module Receptionist updates all bas

How does a flash drive work?, Question 1 What is a desktop? Explain the...

Question 1 What is a desktop? Explain the Windows XP desktop? 2 How does a flash drive work? 3 Write the procedure for creating Macro 4 Explain the process of applyin

Distinguish between passive and active attacks, QUESTION (a) Distinguis...

QUESTION (a) Distinguish between passive and active attacks. (b) Give two reasons why it is important to organise security awareness programs for users. (c) Explain how s

Cipher program in java, Cryptography, the study of secret writing, has been...

Cryptography, the study of secret writing, has been around for a very long time, from simplistic techniques to sophisticated mathematical techniques. No matter what the form howeve

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