Algorithm: shift all bits left, the bit that goes off is set to CF and previous value of CF is inserted to the right-most position. Likewise, if you want to divide a word by another word, then put the dividend word in AX and fill DX with all 0’s. Using a REX prefix in the form of REX.W promotes operation to specify a source operand referencing an 80-bit pointer (16-bit selector, 64-bit offset) in memory. Note that x86 is a little-endian architecture. This instruction copies a word from two memory locations into the register specified in the instruction. EU executes instructions from the instruction system byte queue. If you want to divide a byte by a byte, you must first put the dividend byte in AL and fill AH with all 0’s. The source operand specifies a 48-bit or a 32-bit pointer in memory depending on the current setting of the operand-size attribute (32 bits or 16 bits, respectively). b) Special Address Transfer Instructions: LEA; LDS; LES; LEA Instruction : Load Effective Address : LEA register, source. Microprocessor - 8086 Instruction Sets - The 8086 microprocessor supports 8 types of instructions − ... LDS − Used to load DS register and other provided register from the memory. In the 8086 microprocessor, the Code Segment (CS) register contains the paragraph address that will be added to the Instruction Pointer to obtain the address of the next instruction. They are also called copy instructions. The various characteristics of the Compare (CMP) instruction are as follows: - The CMP instruction can be used to compare two 8-bit or two 16-bit numbers. Instructions to transfer flag registers. It is useful for pointing to SI(DI) and DS(ES) at the start of a string before using a string instruction. en lieu et place de leur contrepartie en 16 bits (ax, bx, etc.).. Instructions originales des 8086/8088 In 64-bit mode, the instruction’s default operation size is 32 bits. If you read the AAA instruction description thoroughly, it says, The AAA instruction is only useful when it follows an ADD instruction that adds (binary addition) two unpacked BCD values and stores a byte result in the AL register. When immediate is greater then 1, assembler generates several RCL xx, 1 instructions because 8086 has machine code only for this instruction (the same principle works for all other shift/rotate instructions). 8086 MEMORY INTERFACING: 8086 addressing and address decoding Interfacing RAM, ROM, EPROM to 8086 INSTRUCTION SET OF 8086 The 8086 instructions are categorized into the following main types (i) Data copy /transfer instructions: These type of instructions are used to transfer data from source operand to destination … Following is the table showing the list of data transfer instructions: Data tranfer instructions are the instructions which transfers data in the microprocessor. Mention the characteristics of the CMP instructions. ds is the default segment from where the pointer value is read using lds and les. ... LDS: Loads a word from the specified memory locations into specified register. 8086 INSTRUCTION SET DATA TRANSFER INSTRUCTIONS ... LDS – LDS Register ... 8086 will generate a type 0 interrupt. They are categorized into the following main types: Data Transfer instruction. The instruction bytes are transferred to the instruction queue. - Whenever a compare operation is performed the result of such an operation reflects in one of the six status flags CF, AF, OF, PF, SF and ZF. 8086 Instruction Set Assembler directives Procedures and macros. The MOV instruction is a 'MOVe' effectively a copy of the address that the TABLE-ADDR label stands for. Elles opèrent alors sur les registres et valeurs 32 bits (eax, ebx, etc.) To use this instruction the word at the lower memory address must contain the offset and the word at the higher address must contain the segment. - Whenever a compare operation is performed the result of such an operation reflects in one of the six status flags CF, AF, OF, PF, SF and ZF. It then copies a word from the next two memory locations into the DS(ES) register. 8086 Data Transfer Instruction Data transfer instruction are those which are used to movement of the data from one location to another location such as memory to microprocessor, microprocessor to port or memory or vice versa. 8086 has two blocks BIU and EU. Ceci est le jeu d'instructions complet pour les processeurs 8086-8088 et la plupart, si ce n'est toutes ces instructions sont accessibles en mode 32 bits. Microprocessor-8086 MCQs Set-3 Contain the randomly compiled multiple choice Questions and answers from various reference books and Questions papers for those who is preparing for the various competitive exams and interviews.

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