It is used to assign any numerical value or constant to the variable. This directive is used at the time of program termination. These two 16-bit data 1020H and 4216H are stored at 4 consecutive locations in the memory MARK. It is used for initialising single or multiple data words (16-bit). Memory name AREA has three consecutive locations where 30H, 52H and 35H are to be stored. This directive is used for the purpose of allocating and initializing single or multiple data bytes. The assembler directives given below are used by 80 assemblers: However, machine codes are only generated for the program that must be provided to the processor and not for assembler directives because they do not belong to the actual program. Therefore, to control the generation of machine codes from the assembly language, assembler directives are used. Thus assembler is used to convert assembly language into machine code so that it can be understood and executed by the processor.

But the microprocessor or microcontrollers are specifically designed in a way that they can only understand machine language. In assembly language programming, the instructions are specified in the form of mnemonics rather in the form of machine code i.e., 0 and 1. We know that assembly language is a less complex and programmer-friendly language used to program the processors. define the start and end of different segments, procedures or macros etc.used to provide storage locations to data,.show the beginning and end of a program provided to the assembler,.Now the question arises what assembler directives specifically do?

8086 microprocessor assembler software