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Instruction Code:--
A Computer is a Binary Code that Specifies a Sequence of Micro Operation.
- Instruction Code Together with Data are Stored in Memory.
- The Computer read each Instruction from the Memory read Operation.
Definition of Instruction Code:-- An Instruction Code of a group of bits that Instructs the Computer to Perform specific Operations.
it has Two Parts each having Particular Instruction.
- Operation Code
- Computer Instruction
1. Operation Code:-- that operation Code of instruction is a Group of bits that Define each Operation Such as Addition, Subtraction, Multiplication, Shift, etc.
2. Computer Instruction:-- The basic Computer has Three instruction Code Formats. each format has 16 bits. the operation Code part of the Instruction Contains Three Bits.
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- A Memory reference Instruction use 12 bits to Specific an Address & 1 bit to Specify address Mode (I).
- I=0 for Direct address, I=1 for Indirect address
- The register reference the Instruction is the Recognized by OP Code 111 With a 0 in the Left Most bit of the Instruction.
- A Register reference Instruction Specify an Operation on Accumulator Register.
- An Input-Output Instruction does not refer to Memory and is recognized by OP 111 with a 1 in the Left most bit of the Instruction.
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