stack instructions, Basic Computer Science

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.
Posted Date: 5/4/2012 4:50:53 AM | Location : United States







Related Discussions:- stack instructions, Assignment Help, Ask Question on stack instructions, Get Answer, Expert's Help, stack instructions Discussions

Write discussion on stack instructions
Your posts are moderated
Related Questions
Disaccharide Sugars: Disaccharide - Carbohydrate made up of two monosaccharides (a sugar dimer) Condensation reaction between 2 monosaccharides Linkage between

QUESTION (i) Define each of the following terms: a) Interlibrary lending b) Manuscript c) Papyrus d) Community profile e) Mauritiana (ii) Explain with example

The 7489 TTL Ram Device: The 7489 TTL Ram package has 64 memory cells, each cell is capable of holding a single bit of data.  The cells are organised into locations, and each l

FCFS algorithm also known as: • First-In-First-Out (FIFO) • Run-Until-Done • Run-to-Completion • Possibly, First-Come-First-Served algorithm is the easiest scheduling algorithm i

what is operator and operator associatively

I am using block matching algorithm to get the motion vectors, now, how can I get the depth map/depth value from the motion vectors?

QUESTION (a) Distinguish between S-HTTP and SSL (b) What are the three basic security provided by SSL? (c) Discuss the limitations of SSL (d) State the port number us

Below you will find a question the areas of automata. Solve the problem showing all steps. Thoroughly explain how and why you performed each step with complete sentences. A finite

They are used to reduce or enlarge the content of the counters. DEC INC DEC INSTRUCTION Idea: To diminish the operator. Syntax: DEC destiny This action subtracts 1 from the destiny

Processor: Processor plays major role in a computer. One should carefully decide about the type of processor and its speed before making a choice. Currently Core 2 Duo process