ADDRESSING MODES OF 8085 By, Er. Swapnil V. Kaware

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This pdf file is all about learning ADDRESSING MODES OF 8085 in simplest and best way. Please read full pdf file for better understanding. This pdf file is also beneficial for learners of UPSC & MPSC, for interview purpose, for freshers as well as for professionals and reaserchers of all Indian as well as global universities/Institutions. For any queries, suggestions or guidance, mail me at "svkaware@yahoo.co.in". keep watching keep learning. For more updates subscribe to my channel on YouTube as "Tech_Guru Swapnil Kaware"......

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slide 1:

Addressing Modes of 8085 Microprocessor For More Contents do subscribe to my channel on you tube as ”Tech_Guru Swapnil Kaware ” Microprocessor Notes by Er. Swapnil V. Kaware svkawareyahoo.co.in

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Addressing Modes of 8085 Microprocessor Presented By Er. Swapnil V. Kaware Assistant Professor B.E. Electronics M.E. Electronics svkawareyahoo.co.in Microprocessor Notes by Er. Swapnil V. Kaware svkawareyahoo.co.in

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Definition • The addressing mode of a microprocessor defines the way in which the operand of instructions can be accessed. • The various ways of specifying data or operands for instructions are also called as addressing modes. Microprocessor Notes by Er. Swapnil V. Kaware svkawareyahoo.co.in

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Opcode Operand • An opcode is short form for Operation Code. • Opcode is an instruction that tells processor what to do with the variable or data written besides it. • Oprand is a variable that stores data and data can be a memory address or any data that we want to process. • e.g. MVI AB • here instruction MVI is an opcode. A B are oprands. Microprocessor Notes by Er. Swapnil V. Kaware svkawareyahoo.co.in

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• Assembly language uses symbolic codes instead of binary or to represent the opcodes known as mnemonics. • Mnemonics are instructions or commands to perform a particular operation given by user to microprocessor. • e.g MOV MVI ADD SUB Mnemonics Microprocessor Notes by Er. Swapnil V. Kaware svkawareyahoo.co.in

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Types of Addressing Modes 1. Immediate addressing mode 2. Register addressing mode 3. Direct addressing mode 4. Register Indirect addressing mode 5. Implied/Implicit addressing mode. Microprocessor Notes by Er. Swapnil V. Kaware svkawareyahoo.co.in

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1 Immediate Addressing Mode • In 8085 the ‘I’ letter falls under this category. • Letter ‘I’ Indicates “Immediate Addressing Mode”. • The data can be either 8 bit or 16 bit. • If the immediate data is 16 bit the instruction is of 3 bytes. • For Example: • MVI A20H: It moves 8 bit immediate data 20H into accumulator. Microprocessor Notes by Er. Swapnil V. Kaware svkawareyahoo.co.in

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2 Register Addressing Mode • In 8085 the “Register Addressing Mode “ specifies the source operand destination operand or both to be contained in an 8085 register. • This results in faster execution because it is not necessary to access memory locations for operands. • For Example: • MOV AB: It moves contents of register B into accumulator A. Microprocessor Notes by Er. Swapnil V. Kaware svkawareyahoo.co.in

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3 Direct Addressing Mode • In 8085 the “Direct Addressing Mode” specifies the 16 bit address of the operand within the instruction itself the second and third bytes of instruction contain 16 bit address. • This is a 3-byte instruction. • The address of the operand is available in the instruction itself • For Example: • STA 8000H Store the contents of the Accumulator in the location 8000H

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4 Register Indirect Addressing Mode • In 8085 The 16-bit address location of the operand stored in a register pair H-L is given in the instruction. • The address of the operand is given in an indirect way with the help of a register pair. So it is called Register indirect addressing mode. • For Example: • MOV MA: It stores the contents of Accumulator A into Memory location M location pointed by HL register pair. Microprocessor Notes by Er. Swapnil V. Kaware svkawareyahoo.co.in

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5 Implied/Implicit Addressing Mode • In 8085 the “Implied/Implicit Addressing Mode” opcode specifies the address of operands. • This mode doesnt require any operand • For Example: • CMA : It Complements the contents of accumulator. Microprocessor Notes by Er. Swapnil V. Kaware svkawareyahoo.co.in

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For More Contents do subscribe to my channel on you tube as ”Tech_Guru Swapnil Kaware ” Thanks For Watching Microprocessor Notes by Er. Swapnil V. Kaware svkawareyahoo.co.in

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