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

Info Systems Management, Assignment 1: Project Management and Information ...

Assignment 1: Project Management and Information Security 2-3 page paper in which you: 1. Explicate in detail the importance of project management as it relate to an informatio

What is the basic model of cpu structure?, As there are many variations i...

As there are many variations in architecture between the different kinds of CPU, we shall begin my looking at an easy model of the structure. The basic model consists of five part

Technology partnerships, Technology Partnerships: Such agreements prov...

Technology Partnerships: Such agreements provide the consumer un-limited access to vendor's technology. Such contracts are typically multi-year in nature where the consumer pa

Java programming, what are the phases of oo progarmming or java?

what are the phases of oo progarmming or java?

What is the difference between kernel mode and user mode fun, The differenc...

The difference between kernel mode and user mode gives a rudimentary form of security in the following manner. Convinced instructions could be executed only when the CPU is in kern

Application software, APPLICATION SOFTWARE Application Software ...

APPLICATION SOFTWARE Application Software generally is the software which is used to generate customized applications for the clients. Ex: Word Star, Lotus 1-2-3, Ms-

Necessary nurses records, Necessary Nurses Records The software shoul...

Necessary Nurses Records The software should generate all registers/reports in detail summary for various permutations and combinations of options. A powerful SQL (Structure

Explian, explain anatomy of digital coputer

explain anatomy of digital coputer

Outdoor patient department features - a patient registry, A Patient Regist...

A Patient Registry Name, Surname and Address  Sex  Caste  Contact Numbers  Area (Rural/Urban/Suburban)  City/District  State  General Examination deta

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