October 18th, 2010


CPU stands for Central Processing Unit is the computer hardware that functions to receive and execute commands and data from the software. Processors are often used to refer to the CPU in general. The microprocessor is the CPU which is produced in integrated circuits, often within a single integrated circuit package. Since the mid-1970s, single-microprocessor integrated circuits have been widely used and become an important aspect in the implementation of the CPU.
Pin 80486DX2 Intel microprocessors.
CPU component is divided into several types, as follows:
Control unit (Control Unit)
This control unit is part of a processor that is able to regulate the course of the program. This component is present in all CPU. CPU charge of controlling a computer so that synchronization occurs between the components work in carrying out operations functions. included in the control unit is the responsibility of taking instructions-instructions from main memory and determine the type of instruction. If there are instructions for arithmetic or logic comparison, the control unit will send instructions to the ALU (Aritmathic Logic Unit). Results of processing data carried by the control unit to the main memory again to be saved, and in time will be presented to the output device. Thus the task of the control unit are:

• Regulate and control the means of input and output.
• Taking instructions from main memory.
• Retrieve data from main memory (if needed) for processing.
• Send the instruction to the ALU if any arithmetic or logical comparisons.
• Overseeing the work of the ALU.
• Save the results of the process to the main memory.
How CPU Work

When data and / or processing-instruction is inserted into the devices, once placed first in the RAM (via Input-storage); if the instruction form fit to the Control Unit in-storage program, but if the form of data accommodated in the Working-storage). If the register is ready to accept work on execution, then the Control Unit would take instructions from the program-storage to ditampungkan to the Instruction Register, while the memory address that contains the instructions are stored in the Program Counter. While the data taken by the Control Unit of Working-storage to be accommodated in General-purpose registers (in this case on Operand-register). If the workmanship is done based instruction is arithmatika and logic, the ALU will take over the operation to do based instruction set. The result is stored in the Accumulator. If the result of processing has been completed, the Control Unit will retrieve the results of processing in the accumulator to fit back into the working-storage. If progress overall has been completed, the Control Unit will pick up the processing of the Working-storage to fit into the Output-storage. Then the rest of Output-storage, processing results will be displayed to the output devices.

CPU Function

CPU functions like a calculator, it’s just much more powerful CPU processing power. The main function of the CPU is to perform arithmetic and logic operations on data retrieved from memory or from the information entered via some hardware, like keyboards, scanners, lever controls, and mouse. CPU controlled using a set of instructions the computer software. The software can be run by the CPU to read from storage media such as hard disks, floppy disks, compact discs, or tape recorder. These instructions are then stored in advance in physical memory (RAM), where each instruction will be given a unique address called a memory address. Furthermore, the CPU can access data in RAM to determine the address of the desired data.

When a program is executed, the data flow from the RAM to a unit called a bus, which connects the CPU with RAM. The data are then decoded by using the unit process known as pendekoder instructions that can translate the instructions. The data then travels to the arithmetic and logic unit (ALU) that perform calculations and comparisons. Data can be stored temporarily by the ALU in a memory location called registers that can be retrieved quickly for processing. ALU can perform certain operations, including addition, multiplication, subtraction, testing conditions on the data in the register, to transmit the processing results back into physical memory, storage media, or register if will process the results of processing anymore. During this process occurs, a unit within the CPU, called the program counter will monitor the instruction successfully executed so that instruction can be executed in the correct and appropriate.

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August 30th, 2010

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