Explain the diferent instruction formats in 8086 micro processor

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10ec62-Micro-processor-->View question

Asked by:milan-ransingh

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a) One byte Instruction : This format is only one byte long and may have the implied data or register operands. The least significant 3 bits of the opcode are used for specifying the register operand, if any. Otherwise, all the eight bits form an opcode and the operands are implied.
b) Register to Register : This format is 2 bytes long. The first byte of the code specifies the operation code and the width of the operand specifies by w bit. The second byte of the opcode shows the register operands and RIM field.
C) Register to/from memory with no displacement : This format is also 2 bytes long and similar to the register to register format except for the MOD field.

d) Register to/from Memory with Displacement :

This type of instruction format contains one or two additional bytes for displacement along with 2-byte the format of the register to/from memory without displacement.

e) Immediate operand to register

In this format, the first byte as well as the 3 bites from the second byte which are used for REG field in case of register to register format are used for opcode. It also contains one or two bytes of immediate data.

f) immediate operand to memory with 16-bit displacement : This type of instruction format requires 5 to 6 bytes for coding. The first two 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.

Answerd By:prajwalamv

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