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11 Oct 2016 Constructing the Machine Codes for 8086 Instructions. - Since there are such a large number of possible codes for the 8086 instructions, it is impractical to list them all in a simple table. - Instead, we use a template for each basic instruction type and fill in bits within this template to indicate the desired
Lock. - Address/Operand size overrides (for 32-bit machines). Encoded as follows (Each in a single byte) ! Repetition. REP, REPE, REPZ. F3H. REPNE, REPNZ. F2H. Note that REP and REPE and not distinct. Machine (microcode) interpretation of REP and REPE code depends on instruction currently being executed.
Addressing Modes. • When the 8088 executes an instruction, it performs the specified function on data. • These data, called operands,. – May be a part of the instruction. – May reside in one of the internal registers of the microprocessor. – May be stored at an address in memory. • Register Addressing Mode. – MOV AX, BX.
1 Feb 2016 8086 INSTRUCTION FORMATS Compiled by: L. Krishnananda, Assistant Professor, REVA ITM, Bangalore 1 Byte 3 Byte 4 UNIT 2. MOD = 00 REG = 011 R/M = 101 The machine code is 0010 1011 0001 1101 2 B 1 D Example 3 :Code for MOV 1234 (BP), DX Here we have specify DX using REG field,
8086/8088 Instruction Set, Machine Codes and Addressing Modes. Software. The sequence of commands used to tell a microcomputer what to do is called a program,; Each command in a program is called an instruction; 8088 understands and performs operations for 117 basic instructions; The native language of the IBM
20 Mar 2013
When the 8088/86 executes an instruction, it performs the specified function on data, These data, called operands,. –May be a part of the instruction. –May reside in one of the internal registers of the microprocessor. –May be stored at an address in memory. • Addressing modes tell us how to locate the operands.
Prefixes: Optional prefixes which change the operation of the instruction; D: (1 bit) Direction. 1 = Register is Destination, 0 = Register is source. W: (1 bit) Operation size. 1 = Word, 0 = byte. Opcode: the opcode is a 6 bit quantity that determines what instruction family the code is; MOD
Opcode 0F - "POP CS" on the 8086, and the first byte in multi-byte opcodes on later processors - is also treated as an undefined opcode. I wouldn't expect to see this in 8086 code (as the "POP CS" instruction is particularly useless) and wanted to treat its appearance as an error condition. * Opcodes C6, C7, and 8F require
Some instructions generate exactly the same machine code, so disassembler may have a problem decoding to your original code. This is especially important for Conditional Jump instructions (see "Program Flow Control" in Tutorials for more information). Instructions in alphabetical order: Instruction. Operands. Description.
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