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1 8086 INSTRUCTION FORMATS. UNIT 2. Instruction Format: The 8086 instruction sizes vary from one to six bytes. Depending on the type of coding, an instruction may have more than one Hexcode, (not unique as in 8085) The OP code field occupies 6-bits.It defines the operation to be carried out by the instruction.
The 8086 instruction sizes vary from one to six bytes. Depending on the type of coding, an instruction may have more than one hex code. Figure below shows the instruction format of 8086:
Nov 11, 2017
Feb 1, 2016 Instruction formats-in-8086. 5. 8086 INSTRUCTION FORMATS Compiled by: L. Krishnananda, Assistant Professor, REVA ITM, Bangalore 5 OUT port, acc : Out transfers a byte or a word from the AL register or the AX register respectively to an output port.
Instruction formats of 8086 : The instruction format of 8086 has one or more number of fields associated with it. The first filled is called operation code field or opcode field, which indicates the type of operation. The instruction format also contains other fields known as operand fields.
Microprocessor 8086 Instruction Sets - Learn Microprocessor in simple and easy steps starting from basic to advanced concepts with examples including Overview, Classification, 8085 Architecture, 8085 Pin Configuration, 8085 Addressing Modes and Interrupts, 8085 Instruction Sets, 8086 Overview, 8086 Functional Units,
Oct 23, 2013
8086 Instruction Encoding-2. Instruction Format (Cont'd) ! Instruction may also be optionally preceded by one or more prefix bytes for repeat, segment override, or lock prefixes. In 32-bit machines we also have an address size override prefix and an operand size override prefix ! Some instructions are one-byte instructions

The immediate byte may be 8 or 16 bit, and the displacement in an instruction can be 0 bits or 8 bits or 16 bits. The OP CODE and addressing mode designation may be 1 to 2 byte. Where the OPCODE use 2 byte, the first byte is OPCODE and the REG field of 2nd byte indicate the rest 3 bits of the OPCODE.

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March 2018