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.

Author: Keran Tehn
Country: Sao Tome and Principe
Language: English (Spanish)
Genre: Love
Published (Last): 18 September 2013
Pages: 172
PDF File Size: 18.89 Mb
ePub File Size: 4.4 Mb
ISBN: 403-6-50474-613-3
Downloads: 91454
Price: Free* [*Free Regsitration Required]
Uploader: Dakree

This directive is used to give a name to mkcroprocessor value or to a symbol. This directive is used to define a variable of type quadword or to reserve storage location of type quadword in memory.

CODE [name] The name in this format is optional.

8085 Assembler User Guide

It consists of the entire instruction set of GROUP This directive is used to group the logical segments named after the directive into one logical group segment. Assembly language consists of two types of statements viz. ALIGN- This directive will tell the assembler to align the next instruction on an address which corresponds to the given value. Newer Post Older Post Home. Executable statements- These are the statements to be executed by the processor.

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 insert a block of source code from the named file into the current source module.

TOP Related Posts  HAYAGRIVA STOTRAM IN ENGLISH PDF

DQ — Define Quadword This directive is used to define a variable of type quadword or to reserve storage location of type quadword in memory. Posted by k10blogger at 2: DW — Define Word. This shortens the source code. 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.

DQ — Define Quadword.

EQU This directive is used to give a name to some value or to a symbol. Define Double word [DD]- It defines the data items that are a double word four bytes in length. 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.

Instructions by Sam Varghese on Prezi

Engineering in your pocket Download our mobile app and study on-the-go. 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. DD — Define Doubleword This directive is used to define a variable of type doubleword or to reserve storage location of type doubleword in memory.

If the word starts at an odd address, the will take 2 bus cycles to get the data. MODEL- This directive is used for selecting a standard memory model for the assembly language program. Write short notes on assembler direectives. 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.

TOP Related Posts  NAKSHATRA CHINTAMANI PDF

Its format is as follows: This directive is used to group the logical segments named after the directive into one logical group segment. When EVEN is used the location counter will simply incremented to next address and NOP instruction is inserted in that incremented location.

The works directly with only 4 physical segments: Define Ten bytes [DT]- It is used to define the data items that are 10 bytes long.

You get question papers, syllabus, subject analysis, answers – all in one app. Mohaimen Himu October 24, at 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.

This directive is used to define a variable of type word or to reserve storage location of type word in memory. DB — Define Byte This directive is used to declare a byte type variable or to store a byte in memory location. DATA- This directive indicates the beginning of the data segment. END- This is placed at the end of a source and it acts as the last statement of assembelr program.

CODE- This assembler directive indicates the beginning of the code segment. DT — Define Ten Bytes.