- An assembly language was mainly used for mnemonics .
- He program that converts this to machine level language is known as assembler.
- Basically it is an aggregation of statements
- We can categorise our custom code into different sections to make it more understandable and more legible.This is achieved by using labels
For E.g:- if we use the label
- It implies that a specific part of the code is defined under this label or loop.
- If we want to loop this forever we can use the while loop.
- The comment field is preceded by the semicolon whereas the labels are succeeded by a colon.
MAJOR STEPS INVOLVED IN ASSEMBLY LEVEL LANGUAGE PROGRAMMING:
- Initially we must use a basic editor such as MS-DOS (old operating system) to produce an ASCII file.
- This .asm source file comprises of program source code.
- The function of the assembler now will be to .
- It serves the programmer well because the complete list of opcodes as well as addresses will be detected.It will eventually produce an .obj file and a .lst file(optional)
- The so called assemblers will be needing a third procedure known as linking where multiple objects are linked together to yield a file with format “abs”.
- Finally this .abs file is converted to hex format by the aid of object to hex converter.
- This hex file will be dumped/burned to the ROM memory of the microchip.
STEPS INVOLVED IN ASSEMBLY LEVEL LANGUAGE CODING:
An illustration of an Assembly level language code:
1.0000 ORG 0H ;starting point at location 0
2 0000 7D25 MOV R5,#35H ;then load 35H into register R5
3.0002 7F34 MOV R7,#44H ;then load 44H into register R7
4.0004 7400 MOV A,#0 ;then load value 0 into accumulator(A)
5.0006 2D ADD A,R5 ;then sum contents of R5 with Accumulator
6.0007 2F ADD A,R7 ;then add contents of R7 with Accumulator
7.0008 2412 ADD A,#12H ;then add value in Awith 12 H
8.000A 80FE HERE: SJMP HERE ;keep staying in this loop
9.000C END ;finally the asm file ends here
- Note that each directives have a specific function to perform such as MOV mimplies the result is moved to a particular register or the accumulator.
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