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 with name of the segment to indicate the end of that logic segment. This directive is used to define a variable of type word or aasembler reserve storage location of type word in memory.

8085 Assembler User Guide

This directive is used to insert a block of source code from the named file into the direcgives source module. CODE- This assembler directive indicates the beginning of the code segment.

Each memory model has various limitations depending on the maximum space available for code and data. This directive is used to declare a byte type variable or to store a byte in memory location.

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. You get question papers, syllabus, subject analysis, answers – all in one app.

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Define Double word [DD]- It defines the data items that are a double word four bytes in length. Rest will be added with imcroprocessor. DB — Define Byte This directive is used to declare a byte type variable or to store a byte in memory location. This directive is used to define a variable of type doubleword or to reserve storage location of type doubleword in memory. EQU This directive is used to give a name to some value or to a symbol.

Newer Post Older Post Home. This directive is used to group the logical segments named after the directive into one logical group segment. Engineering in your pocket Download our mobile app and study on-the-go. DB — Define Byte. DT — Define Ten Bytes.

Its format is as follows: This directive is used to give a name to some value or to a symbol. ENDS This directive is used with name of the segment to indicate the end of that logic segment. 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 machine executable. DW — Define Word This direectives is used asseembler define a variable of type word or to reserve storage location of type word in memory.

END- This is placed at the end of a source and it acts as the last statement of a program. Assembler directives- These are the statements that direct the assembler to do something. The microporcessor directives can be divided into two categories namely the general purpose directives and the special directives.

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Write short notes on assembler directives. Define Ten bytes [DT]- It is used to define the data items that are 10 bytes long. As the name says, it directs the assembler to do a task.

DQ — Define Quadword. DD — Define Doubleword This directive is used to define a variable of type doubleword or to reserve storage location of type doubleword in memory. 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.

Executable statements- These are the statements to be executed by the processor.

MICROPROCESSOR AND MICROCONTROLLER: Assembler Directives of /

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. Assembly language consists of two types of statements viz.