Assembly Language Programming By Ytha Yu, Charles Marut Chap 1(Microcomputer Systems)

Feb 11, 20172 likes2,908 views

This document discusses computer languages and microprocessor-based systems. It describes how machine language uses binary instructions to directly control a processor's circuitry. Assembly language and high-level languages were developed to bridge the gap between machine language and what is convenient for humans. Assembly language uses symbolic names for operations and memory locations and converts to machine language via an assembler. High-level languages like Pascal and COBOL use expressions and symbols from English and convert to machine language via a compiler. Advantages of assembly language include better performance and access to hardware for some applications where speed and size are critical.

Microprocessor Based Systems
Spring 2014
Department of Electrical Engineering
University of Gujrat

= Machine that can solve problems
HOW? YOU tell it what to do~~ IN A PROGRAM!!!

0010100110101001001
1101011011110100101
1101101010000100110
1000001001001001101
•A collection of instructions.
•The instructions are a series of 1’s and zero’s that control
the internal circuitry of the processor.
•The instructions are written in a language called:
Machine Language

• Difficult and tedious for people to use because of simplicity
• A large gap between what is convenient for
People and what for computers
• People want to do X but computers limitation is
only to Y

Machine Language
Ex.
10100001 00000000 00000000
00000101 00000100 00000000
10100011 00000000 00000000
Collection of binary
numbers
Assembly Language
Computer languages
Assembly Language High-Level Language
Ex.
MOV AX,A
ADD AX,4
MOV A,AX
Ex.
A = A + 4
Combines algebraic
language (I.e. symbolic
names are used to
represent operations,
registers & memory locations
expressions & symbols taken
from English language (ex.
Pascal, COBOL FORTRAN,
…etc)

Computer languages (Continue)
Not standard (I.e. different Not standard (I.e. different Standard (I.e. programs are
machine language for assembly language for independent of the machine
every type of machine every type of machine) on which they will be
executed)
Machine Language Assembly Language High-Level Language
Directly understood by a Assembler Compiler (or interpreter)
computer converts to machine converts to machine
language language
1 assembly language 1 HLL instruction = many
instruction = 1 machine machine language
language instruction instructions

Advantages of Assembly Language
• Performance:
• A well-written Assembly language program produces a faster,
shorter machine language program.
For Some applications speed and size is critical
• Access to hardware:
•Some operations, such as reading or writing to specific
memory locations & I/O ports can be done easily in Assembly
but may be impossible by a higher level language.
• Studying ASM language gain a feeling of the way the computer
thinks and the way things happen inside the computer.

Here are the steps to solve this problem: 1. Display a '?' to prompt the user for the first number 2. Read the first number into AL 3. Display a '+' and another '?' to prompt for the second number 4. Read the second number into BL 5. Add AL and BL and store the result in CL 6. Display the message "THE SUM OF" 7. Display the first number stored in AL 8. Display " AND " 9. Display the second number stored in BL 10. Display " IS " 11. Display the result stored in CL Main ENDP END Main

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