Processing in computer happens with the component called a processor (CPU). The CPU is basically a small chip which processes all the computer programs. The CPU is always placed on the motherboard and it makes its communication with all the hardware components that relate to the computer system. Each process must, compulsorily, get into the processor to get processed. Every program in the computer will be in the form of a set of instructions. The CPU goes thorough four steps to process a program without any errors. They are- Fetch, Decode, Execute and Write Back. Every step is explained in detail.
Fetch and Decode
The first step that the CPU uses to process is the Fetch step. Initially, when the user of the computer gives a command to open a program that is saved inside it, the CPU first receives the request made by the user and it processes the request. The central processing unit then retrieves the program that is requested by the user form the memory of the computer system. Each program and every program that is requested from the user has a unique program counter number. The program counter number acts as the base to locate the program and receive further instructions. The next phase of the processing activity is, the â€˜decodeâ€™ phase. After fetching a program, the computer needs to understand it. Machine language is the only format that the computer understands. The program must be first ciphered into the format that the computer can understand. The programmers use thousands of software for their applications. So, basically the CPU must first understand the language which was used by the user. After identifying the language, the CPU decodes the information to understand what instruction is given by the user. The decode process follows a sequence of steps. Initially, the CPU decomposes the coding into smaller units, such that the code becomes easier to manage. CPU can directly communicate with few components of the computer. For the decoding activity, the CPU makes use of the opcodes. Opcodes are used to point out the numerical ordering of the code. The opcode informs the CPU the order in which it must execute the code. Sometimes, there will be situations where the CPU will not be able to interpret the code. In such situations the CPU uses a translator. The translator used by the CPU is called as a micro program. The micro program will interpret the code and it will send back the instructions to the CPU in an understandable way.
Execute and Write back
The next stage is the Execute stage. After detecting the numerical order of the given instructions, the CPU executes the instructions by maintaining the order. The program gets loaded in this stage. All the essentials that are needed for the execution of the instructions (for example the micro programs and the opcodes) are loaded in this phase. The last phase is the â€˜Write backâ€™ phase. The CPU makes a feedback on the previous three phases to ensure there are no problems for the instructions while getting loaded. For example, if there is an error and the windows do not load properly, the CPU writes this error in the memory of the computer and when the computer is restarted after some time, the CPU fetches the error instruction form the memory and displays the user that there are problems in loading windows. The processer (CPU) uses the above mentioned four steps to process the instructions.
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