5/26/2023 0 Comments Addressing modes of 8086MOV instructions, and the PUSH and POP instructions, also use the 16-bit In the 80386 and above, the extended 32-bit registersĪre EAX, EBX, ECX, EDX, ESP, EBP, EDI, and ESI. Also present are the following 16-bit registers: AX, BX,ĬX, DX, SP, BP, SI, and DI. The microprocessorĬontains the following 8-bit registers used with register addressing: AH, AL, BH, BL, CH, CL, DH, and DL. The source andĪddressing is the most common form of data addressing. Register remains unaffected by most data transfer instructions. Never actually picks up the data and moves it. ![]() Remember that a MOV instruction always copies the source data and into the destination. ![]() The source neverĬhanges, but the destination usually changes. The source register (BX) into the destination register (AX). The right and the destination is to the left, next to the opcode MOV.Īn opcode, or operation code, tells the microprocessor which operationĭ In Figure 3-1, the MOV AX,BX instruction transfers the word contents of MOV instruction and defines the direction of data flow. ![]() The MOV instruction is a common and flexible instruction, it provides a basisįor the explanation of the data-addressing modes. Of the stack memory is explained so that the PUSH and POP instructions With the addressing modes employed by each instruction. ![]() Software development for the microprocessor requires a complete familiarity
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