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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DD — Define Doubleword.

DW — Define Word This directive is used to define a variable of type word or to directjves storage location of type word in memory. If the word is at even address can read a memory in 1 bus cycle. If the word starts at an odd address, the will take 2 bus cycles to get the data.

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This directive is used to group the logical segments named after the directive into one logical group segment. 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.

Rest will be added with time……. A series of words can be read much more quickly if they are at even address. This directive is used to insert a block of source code from the named file into the current source module. The assembler directives can be divided into two categories namely the general purpose directives and the special directives. Assembly language consists of microprocesosr types of statements viz.

DQ — Define Quadword This directive is used to define a variable of type quadword or to reserve storage location of type quadword in memory. DW — Define Word. Define Double assrmbler [DD]- It defines the data items that are a double word four bytes in length. This directive is used to declare a byte type variable or to store a byte in memory location. DT — Define Ten Bytes This directive is used to define a variable which is 10 bytes in length or to reserve directkves bytes of storage in the memory.

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8085 Assembler User Guide

END- This is placed at the end of a source and it acts as the last statement of a program. DT — Define Ten Bytes. This directive is used with name of the segment to indicate the end of that logic segment.

This directive tells the assembler the name of the logical segment it should use for a specified segment. 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.

CODE- This assembler directive indicates the beginning of the code segment. Newer Post Older Post Home. Assembler directives- These are the statements that direct the assembler to do something. Download our mobile app and study on-the-go.

This shortens the source code. 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. DQ — Define Quadword. INCLUDE- This directive is used to tell the assembler to insert a block of source code from the named file into the current source module.

This directive is used to define a variable of type doubleword or to reserve storage location of type doubleword in memory. Each time the assembler finds the name in the program, dorectives will replace the name with assembldr value or symbol you given to that name. This directive is used to define a variable which is 10 microproceszor in length or to reserve 10 bytes of storage in the memory.

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As the name says, it directs the assembler to do a task. EQU This directive is used to give a name to some value or to a symbol. Posted by k10blogger at 2: DB — Define Byte. This directive is used to define a variable of type word or to reserve storage location of type word in memory. This directive instructs the assembler to increment the location of the counter to the next even address if it is asxembler already in the even address. GROUP This directive is used to group the logical segments named after the directive into one logical group segment.

ALIGN- This directive will tell the assembler to align the next instruction on an address which corresponds to the given value. DD — Define Doubleword This directive is used to define a variable of type doubleword or to reserve storage location of type doubleword in memory. You get question papers, syllabus, subject analysis, answers – all in one app.

Its format is as follows: Dirdctives 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.

When EVEN is used the location counter will simply incremented to next address and NOP instruction is inserted in that incremented location. This is because the END directive terminates the entire program. Define Ten bytes [DT]- It is used to define the data items that are 10 bytes long.