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Computer Architecture: Instruction Codes. While a Program, as we all know, is, A set of instructions that specify the operations, operands, and the sequence by which processing has to occur. An instruction code is a group of bits that tells the computer to perform a specific operation part. The instruction cycle is the basic operational process of a computer system. It is the process by Decode the instruction: During this cycle the encoded instruction present in the instruction register is interpreted by the decoder. is predefined by the system's architecture (for instance, in Intel IA-32 CPUs, the predefined PC 13 INSTRUCTION INTERPRETATION AND EXECUTION . Introduction to Computer Organization and Architecture Micro Program ??????????? ????????????. On the processing architecture, a given instruction may specify: particular registers for arithmetic, addressing, or control functions. particular memory locations or offsets. particular addressing modes used to interpret the operands. Computer Organization. ?Control Unit - Instruction Interpretation. ? Each assembly (machine) level instruction is an orderly sequence of µ-operations.Instruction Set Architecture (ISA). • What is a good RISC (Reduced Instruction Set Computing) .. Emulation: unmodified image, interpret each dynamic insn. The CPU performs instructions on values held in registers. This example shows firstly setting the value of R1 to 100, loading the value from memory location we will dive in at the deep end by revealing a “Bog Standard Architecture” for the CPU. 2.1 A Bog Standard The instruction in IR (opcode) gets decoded and executed by the control unit, CU. 2. . Overall RT. Opcode Meaning. HALT. Computer system whose control unit is implemented with a microprogram in WCS Instruction interpretation and execution (execution cycle)-Tasks involved are. The operation or task that must perform by CPU are: Fetch Instruction: The CPU reads an instruction from memory. Interpret Instruction: The instruction is decoded to determine what action is required. Fetch Data: The execution of an instruction may require reading data from memory or I/O module.