Programs in assembly language are represented by certain words representing the operation of instruction. Thus programming gets easier. Assembly language statements are generally written in a standard form that has four fields.
- Label field
- Op-code field (Instruction or Mnemonic)
- Operand field
- Comment field
Let us consider a simple example to add two numbers
|
Label
|
Mnemonic
|
Operand
|
Comment
|
|
Start:
|
MVI
|
A,
10h
|
;
Move 10h into accumulator
|
|
|
MVI
|
B,
20h
|
;
Move 20h into register B
|
|
|
ADD
|
B
|
;
Add the contents of register B with accumulator
|
Thus, we see the ease with the assembly language rather than machine language.
Mnemonic is a short alphabetic code used in assembly language for microprocessor operation. These are words (usually two-to-four letter) used to represent each instruction.
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