Addressing Modes of 8085 μP PRESENTED BY:- KRISHNA BALLABH GUPTA

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Presentation transcript:

Addressing Modes of 8085 μP PRESENTED BY:- KRISHNA BALLABH GUPTA B.TECH [CSE] SCE D,DUN

Architecture of 8085 μP

Addressing Modes Every instruction of a program has to operate on a data. The method of specifying the data to be operated by the instruction is called Addressing. The 8085 has 5 different types of addressing modes. 1. Immediate Addressing 2. Direct Addressing 3. Register Addressing 4. Register Indirect Addressing 5. Implied Addressing

1. Immediate Addressing: In immediate addressing mode, the data is specified in the instruction itself. The data will be a part of the program instruction. EX. MVI B, 3E - Move the data 3E given in the instruction to B register LXI SP, 2700 Please guess other examples

2. Direct Addressing: In direct addressing mode, the address of the data is specified in the instruction. The data will be in memory. In this addressing mode, the program instructions and data can be stored in different memory. EX. LDA 1050 - Load the data available in memory location 1050H in to accumulator; SHLD 3000 Please guess other examples

3. Register Addressing: In register addressing mode, the instruction specifies the name of the register in which the data is available. EX. MOV A, B - Move the content of B register to A register; ADD C Please tell other examples

4. Register Indirect Addressing: In register indirect addressing mode, the instruction specifies the name of the register in which the address of the data is available. Here the data will be in memory and the address will be in the register pair. EX. MOV A, M - The memory data addressed by H L pair is moved to A register. LDAX B Please tell other examples

5. Implied Addressing: In implied addressing mode, the instruction itself specifies the data to be operated. EX. CMA - Complement the content of accumulator; RAL What are the other examples

Probable Questions.. What do you mean by addressing mode in 8085 microprocessor? Name different types of addressing modes of 8085. Explain different types of addressing modes, with examples. Specify the addressing mode used in following instructions: MOV A M; SUI DC; IN 00; RAR; XRA B What is Instruction format and Addressing Mode? Explain(09)