Register Addressing Mode: MOV CL, BL means move 8-bit data from BL to CL. MOV DX, AX means move 16-bit data from AX to DX register.
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Data-Addressing Modes
The MOV instruction is a common and flexible instruction, it provides a basis for the explanation of the data-addressing modes. illustrates the MOV instruction and defines the direction of data flow. The source is to the right and the destination is to the left, next to the opcode MOV. An opcode, or operation code, tells the microprocessor which operation to perform.
The MOV AX,BX instruction transfers the word contents of the source register (BX) into the destination register (AX). The source never changes, but the destination usually changes. It is essential to remember that a MOV instruction always copies the source data and into the destination. The MOV never actually picks up the data and moves it.