Chapter 3 my notes

Chapter 3 my notes - C hapter 3 MOV instruction t ransfers...

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Chapter 3 MOV instruction transfers bytes or words of data between 2 registers or between registers and memory Data addressing modes include register, immediate, direct, register indirect, base- plus index, register-relative, and base relative-plus-index Memory addressing modes include program relative, direct, and indirect MOV is an opcode operation code, tells the microprocessor which operation to perform The source is to the right, the destination is to the left; both of these are next to the opcode MOV o The source and destination are always separated by a comma Note: memory to memory transfers are NOT allowed except when used with the MOVS instruction The MOV instruction always COPIES data, it never picks up data and moves it Example: o MOV AX, BX Transfers the word contents of the source register (BX) into the destination register (AX) DATA ADDRESSING MODES Register Addressing: o Transfers a copy of a byte or word from the source register or contents of a memory location to the destination register or memory location o Example : MOV AX,BX Immediate Addressing: o
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