[PDF] 8086 instruction encoding format

This type of instruction format requires 5 or 6 bytes for coding. The first 2 bytes contain the information regarding OPCODE, MOD and R/M fields. The remaining 4 bytes contain 2 bytes of displacement and 2 bytes of data as shown.
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  • What is the instruction format in 8086?

    8086 Instruction Format vary from 1 to 6 bytes in length. The opcode and the addressing mode is specified using first two bytes of an instruction. W-bit :It specify whether instruction is a byte instruction (W = 0) or a word instruction (W = 1).

  • What is MOV instruction format in 8086?

    MOV: Data transfer Register/memory to/from register. This format is similar to register to register transfer. The difference is in mod field. For register to register, mod = 11 For register to/from memory with no displacement, mod = 00.

  • What is instruction set encoding?

    The encoding of instructions, which is a key aspect of an Instruction Set Architecture, defines how instuctions and arguments are encoded as binary values in the machine code of a system.
  • Ans. The instruction queue is 6-bytes in length, operates on FIFO basis, and receives the instruction codes from memory.
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