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ASSEMBLER DIRECTIVES OF 8085 MICROPROCESSOR PDF

Using the Section Directive · Setting up the Linker · Running the Assembler from the Command Line MICROPROCESSOR INSTRUCTION REFERENCE ACI. The most commonly used assembler directives are ORG, DB, DW, EQU, and END. For example, 0 ORG C 1 00H directive informs the assembler to assemble. Assembly Language Format Assembler Example Description. Directive. ORG ( Origin) ORG H The *Please Refer to Assembly Code Summary.

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This directive is used to define a variable of type doubleword or to reserve storage location of type doubleword in memory. This directive is used to directjves the logical segments named after the directive into one logical group segment. This directive is used with name of the segment to indicate the end of that logic segment.

DB — Define Byte. This directive is used to give a name to some value or to a symbol.

8085 Assembler User Guide

The specialty of these statements is that they are effective only during the assembly of a program but they do not generate any code that is zssembler executable. END- This is placed at the end of a source and it acts as the last statement of a program. The assembler directives can be divided into two categories namely the general purpose directives and the special directives.

A series of words can be read much more quickly if they are at even address. Engineering in your pocket Download our mobile app and study on-the-go.

When EVEN is used the location counter will simply incremented to next address and NOP instruction is inserted in that incremented location. Define Quad word [DQ]- This directive is used to tell the assembler to declare variable 4 words in length or to reserve 4 words of storage in memory.

ENDS This directive is used with name of the segment to indicate the end of that logic segment. DW — Define Word. You get question papers, syllabus, subject analysis, answers – all in one app.

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Mohaimen Himu October 24, at Rest will be added with time……. Each memory model has various limitations depending on the maximum space available for code and data.

Posted by k10blogger at 2: DATA- This directive indicates the beginning of the data segment. EVEN This directive instructs the assembler to increment the location of the counter to the next even address if it is not already in the even address.

DT — Define Ten Bytes. This directive tells the assembler the name of the logical segment it should use for a specified segment.

This directive is used to define a variable of type quadword or direcyives reserve storage location of type quadword in memory. It consists of the entire instruction set of DQ — Define Quadword This directive is used to define a variable of type quadword or to reserve storage location of type quadword in memory.

Assembler directives- These are the statements that direct the assembler to do something. DW — Define Word This directive is used to define a variable of type word or to reserve storage location of type word in memory.

DQ — Define Quadword. CODE- This assembler directive indicates the beginning of the code segment. EQU This directive is used to give a name to some value or to a symbol. CODE [name] The name in this format is optional. This directive is used to define a variable of type word or to reserve storage location of type word in memory.

Download our mobile app and study on-the-go. Executable statements- These microprocessot the statements to be executed by the processor.

DD — Define Doubleword This directive is used to define a variable of type doubleword or to reserve storage location of type doubleword in memory. DT — Define Ten Bytes This directive is used to define a variable which is 10 bytes in length or to reserve 10 bytes of storage in the memory.

DD — Define Doubleword. GROUP This directive is used to group the logical segments named after the directive into one logical group segment. The works directly with only 4 physical segments: Assembly language consists of two types of statements viz. This directive is used to declare a byte type variable or to store a byte in memory location.

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This is because the END directive terminates the entire program. As the name says, it directs the assembler to microprocssor a task.

Write short notes on assembler directives

They are classified into the following categories based on the function performed by them- Simplified segment directives Data allocation directives Segment directives Macros related directives Code label directives Scope directives Listing control directives Miscellaneous directives. This directive is used to define a variable which is 10 bytes in length or to reserve 10 bytes of storage in the memory. If the word starts at an odd address, the will take 2 bus cycles to get the data.

This directive instructs the assembler to increment the location of the counter to the next even address if it is not already in the even address. MODEL- This directive is used for selecting a standard memory model for the assembly language program.

Each time the assembler finds the name in the program, it will replace the name with the value or symbol you given to that name. This shortens the source code. This directive is used to insert a block of source code from the named file into the current source module. Write short notes on assembler directives. If the word is at even address can read a memory in 1 bus cycle.

Define Double word [DD]- It defines the data items that are a double word four bytes in length. Define Ten bytes [DT]- It is used to define the data items that are 10 bytes long.