Assembly Language Programming Of 8085. 1.

Assembly Language Programming of 8085 Unit-2. Topics Introduction Programming model of 8085 Instruction set of 8085 Example Programs Addressing modes of 8085 Instruction & Data Formats of 8085. 1. Introduction A microprocessor executes instructions given by the user Instructions should be in a language known to the microprocessor Microprocessor understands the language of 0’s and 1’s only This language is called Machine Language.

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For e.g. 01001111 Is a valid machine language instruction of 8085 It copies the contents of one of the internal registers of 8085 to another. A Machine language program to add two numbers 00111110;Copy value 2H in register A 0000110;Copy value 4H in register B 0000000;A = A + B.

Programs In 8085 Microprocessor Palindrome Definition

Assembly Language of 8085 It uses English like words to convey the action/meaning For e.g. MOV to indicate data transfer ADD to add two values SUB to subtract two values. Assembly language program to add two numbers MVI A, 2H;Copy value 2H in register A MVI B, 4H;Copy value 4H in register B ADD B;A = A + B Note: Assembly language is specific to a given processor For e.g. Assembly language of 8085 is different than that of Motorola 6800 microprocessor. Microprocessor understands Machine Language only! Microprocessor cannot understand a program written in Assembly language A program known as Assembler is used to convert a Assembly language program to machine language Assembly Language Program Assembler Program Machine Language Code.

Low-level/High-level languages Machine language and Assembly language are both Microprocessor specific ( Machine dependent ) so they are called Low-level languages Machine independent languages are called High-level languages For e.g. BASIC, PASCAL,C,C,JAVA, etc. A software called Compiler is required to convert a high-level language program to machine code. 2.