Loading instructions, Basic Computer Science

Assignment Help:
They are particular register instructions. They are used to load bytes or sequences of bytes onto a register.
LODS (LODSB) (LODSW)
LAHF
LDS
LEA
LES
LODS (LODSB) (LODSW) INSTRUCTION
Goal: To load sequences of a byte or a word into the accumulator.
Syntax:
LODS
This instruction takes the sequence found on the address specified by SI, loads it to the AL (or AX) register and adds or subtracts , depending on the state of DF, to SI if it is a bytes transfer or if it is a words transfer.
MOV SI, OFFSET VAR1
LODS
The first line loads the VAR1 address on SI and the second line receives the content of that locality to the AL register.
• The LODSB and LODSW commands are used likewise, the first one loads a byte and the second one a word (it uses the whole AX register).
LAHF INSTRUCTION
Goal: It transfers the full content of the flags to the AH register.
Syntax:
LAHF
This instruction is helpful to make sure the state of the flags through the execution of our program.
LDS INSTRUCTION
Goal: used to load the register of the data segment
Syntax:
LDS destiny, source
The source operator must be a dual word in memory. The word related with the largest address is transferred to DS, in other words it is taken as the segment address. The word associated with the lesser address is the displacement address and it is deposited in the register indicated as destiny.
LEA INSTRUCTION
Goal: To load the address of the source operator
Syntax:
LEA destiny, source
The source operator must be situated in memory, and its displacement is placed on the index register or specified pointer in destiny.

Related Discussions:- Loading instructions

What are the different types of props, Question 1 Explain the importance o...

Question 1 Explain the importance of edge loops and anatomical body functions in animation Question 2 What are the three sets of curves for the hair system? Questio

Project management, #Assignment 1: Project Management and Information Secur...

#Assignment 1: Project Management and Information Security Write a two to three (2-3) page paper that addresses the following: Explicate in detail the importance of project managem

Backup storage, Backup Storage: Back up (backing) storage, also termed...

Backup Storage: Back up (backing) storage, also termed external storage, is used to hold programs and data which are read into internal storage when required. The most common

Audio/video applications on network, AUDIO/VIDEO APPLICATIONS ON NETWORK ...

AUDIO/VIDEO APPLICATIONS ON NETWORK Clinical applications of a computer include recording of slit lamp images on a computer. These still images or even videos can be recorde

Explain Modern architecture of microprocessor, There are many other techniq...

There are many other techniques in which companies who manufacture microprocessors have attempted to get better the performance of their CPUs. Cache memory this is a small quantit

Define the elements of contlor unit , The three main elements of the con...

The three main elements of the control unit are: 1. Decoder this is used to decode the instructions that create a program when they are being processed, and to establish in what ac

Examples of online databases, Examples of Online Databases: The adopti...

Examples of Online Databases: The adoption of modern technology has resulted in the proliferation of machine readable databases. The National Library of Medicine (USA) designe

Noemalization.., what is means with respect to software engineering?

what is means with respect to software engineering?

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