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Editor to share with you in cpu in addition to the internal bus and the necessary registers which are the main components, I believe that most people do not know much, so share this article for your reference, I hope you can learn a lot after reading this article, let's go to know it!

In cpu, in addition to the internal bus and necessary registers, the two main components are the arithmetic unit and the controller. The CPU CPU consists of an arithmetic unit and a controller, which can interpret and execute instructions.

In cpu, in addition to the internal bus and necessary registers, the two main components are the arithmetic unit and the controller.

Central processing unit (CPU) is one of the main equipment of electronic computer and the core accessory of computer. Its main function is to interpret computer instructions and process data in computer software. CPU is the core component in the computer which is responsible for reading instructions, decoding instructions and executing instructions. The CPU mainly consists of two parts, namely, the controller and the arithmetic unit, including the cache memory and the data and control bus to realize the relationship between them. The three core components of electronic computer are CPU, internal memory and input / output equipment. The main functions of the CPU are processing instructions, performing operations, controlling time, and processing data.

Controller

The controller refers to the main command device which controls the start, speed regulation, braking and reverse of the motor by changing the wiring of the main circuit or control circuit and changing the resistance value in the circuit according to the predetermined order. The controller is composed of program status register PSR, system state register SSR, program counter PC, instruction average register and so on. As a "decision-making body", its main task is to issue commands and play the role of coordination and command of the whole computer system operation. The classification of control mainly includes two kinds, namely combinational logic controller and microprogram controller, both of which have their own advantages and disadvantages. Among them, the structure of the combinational logic controller is relatively complex, but the advantage is that the speed is fast; the structure of the microprogram controller is simple, but in modifying a machine instruction function, all the microprograms need to be reprogrammed.

Arithmetic unit

The arithmetic unit is composed of arithmetic logic unit (ALU), accumulator, state register, general register group and so on. The basic functions of arithmetic logic operation unit (ALU) are four operations of addition, subtraction, multiplication and division, logic operations such as and, OR, no, XOR, shift, complement and so on. When the computer is running, the operation and type of operation of the arithmetic unit are determined by the controller. The data processed by the arithmetic unit comes from the memory; the processed result data is usually sent back to the memory or temporarily stored in the arithmetic unit. Together with Control Unit, it forms the core part of CPU.

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