FUNDAMENTALS OF COMPUTER

Detailed explanation-1: -The decoding process allows the CPU to determine what instruction is to be performed so that the CPU can tell how many operands it needs to fetch in order to perform the instruction. The opcode fetched from the memory is decoded for the next steps and moved to the appropriate registers.

Detailed explanation-2: -The CPU executes a program that is stored as a sequence of machine language instructions in main memory. It does this by repeatedly reading, or fetching, an instruction from memory and then carrying out, or executing, that instruction.

Detailed explanation-3: -A sequence of instructions describing how to perform a certain task is called a program. A computer’s primitive instructions form a language in which it is possible for people to communicate with the computer . Such a language is called a machine language.

Detailed explanation-4: -The actual mathematical operation for each instruction is performed by a combinational logic circuit within the CPU’s processor known as the arithmetic–logic unit or ALU. In general, a CPU executes an instruction by fetching it from memory, using its ALU to perform an operation, and then storing the result to memory.