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Asked: 2022-03-16T20:10:44+05:30 In:

Analyse and Write function and number of bytes present in the following instructions:- i) MVI A,05H     ii) STA 3000H iii) DAD B   iv) …

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Analyse and Write function and number of bytes present in the following instructions:-

i) MVI A,05H     ii) STA 3000H iii) DAD B   iv) XCHG v) MOV C,M

microprocessor and interfacing
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    1. I'M ADMIN

      i) MVI A,05H :

      • MVI is a mnemonic, which actually means “Move Immediate”.
      • This instruction supports immediate addressing mode for specifying the data in the instruction.
      • It is 2-byte instruction.

       

      ii) STA 3000H:

      • STA is a mnemonic that stands for STore Accumulator contents in memory.
      • STA 3000H is an 8085 instruction that says to store the accumulator at memory location 3000H.
      • It is 3-byte instruction.

       

      iii) DAD B:

      • DAD is a mnemonic, which stands for Double ADd and also rp stands for any one of the following register pairs as mentioned
      • rp = BC, DE, or HL
      • It is 1-byte instruction.

       

       

      iv) XCHG:

      • XCHG, which stands for eXCHanGe.
      • This is an instruction to exchange contents of HL register pair with DE register pair. This instruction uses implied addressing mode.
      • As it is1-Byte instruction, so It occupies only 1-Byte.

       

      v) MOV C,M:

      • MOV C, M is an instruction where the 8-bit data content of the memory location as pointed by HL register pair will be moved to the register C. 
      • It is 1-byte instruction

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