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A CPU (Central Processing Unit) is the most important component of a computer system. It is the electronic circuitry that executes the instructions of a computer program by performing the basic arithmetic, logical, control and input/output operations2.
A CPU consists of three major units:
Memory or Storage Unit: This unit stores data, instructions, programs, and intermediate results. It also communicates with the input and output devices and other components of the computer system1.
Control Unit: This unit controls the flow of data within the CPU and between the CPU and other devices. It interprets the instructions of the program and coordinates the activities of the ALU and the memory unit1.
ALU (Arithmetic Logic Unit): This unit performs arithmetic and logic operations on data. It can perform operations such as addition, subtraction, multiplication, division, comparison, etc1.
The following diagram shows a simplified representation of the CPU architecture:
Source: [2]
The diagram shows how the CPU communicates with other components of the computer system through buses. A bus is a set of wires that carries data, address, or control signals. There are three types of buses:
Data Bus: This bus transfers data between the CPU and the memory or input/output devices.
Address Bus: This bus carries the address of the memory location or input/output device that the CPU wants to access.
Control Bus: This bus carries control signals that indicate the type of operation that the CPU wants to perform.
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Central processing unit - Wikipedia
A central processing unit (CPU), also called a central processor, main processor, or just processor, is the most important processor in a given computer. Its electronic circuitry executes instructions of a computer program, such as arithmetic, logic, controlling, and input/output (I/O) operations. This role contrasts … See more
Hardwired into a CPU's circuitry is a set of basic operations it can perform, called an instruction set. Such operations may involve, for example, … See more
The performance or speed of a processor depends on, among many other factors, the clock rate (generally given in multiples of hertz) and the instructions per clock (IPC), which together are the factors for the instructions per second (IPS) that the CPU can perform. … See more
The fundamental operation of most CPUs, regardless of the physical form they take, is to execute a sequence of stored instructions that is called a program. The instructions to be executed are kept in some kind of computer memory. Nearly all CPUs follow the … See more
Most modern CPUs have privileged modes to support operating systems and virtualization.
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