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8 Cards in this Set
- Front
- Back
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This is often described as the brain of the computer.
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The purpose of the CPU is to process data. It is where all the searching, sorting calculating and decision making takes place in the computer.
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The CPu fetched the data and intructions from the main memory and stores them it its own temporary memory areas.
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These temporary memory areas are called registers.
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For the fetch part of the cycle to happen, the CPY places the address of the next item in a vital hardware path called the address bus.
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Data from this bus then moves from the main memory into the CPu bu travelling along another bus called the data bus. The next step is for the CPU to make sense of the instructions. This process is called decode.
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The CPU is designed to understand a specific set of commans which are different for every CPU. These set of commands are called the instruction set.
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The CPU decodes the instructions and prepares various areas with the chip.
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Execute is the part of the cycle where the actual data processing takes place.
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The control unit:
- It controls and monitors the harware attached to the system to make sure that the commands given to it by the application software are used. For example, if you send something to print, the control unit will keep a check that the instructions are sent to the printer correctly. - It controls the input and output data so that the signals go to the right place at the right time. - It controls the flow of data within the CPu - which is the Fetch-Execute cycle. |
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The CPU reads data and programs kept onthe backing storage and stores is in the immediate access store.
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The CPU needs to store data and programs in the immediate access store because it is much too slow to run applications directly.
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The arithmetic logic unit acts upon the data.
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- Arithmetic part - which does exactly what you think it should - it performs the calculations on the data
- Logic part - this deals with logic and comparisons. For example, it works out if one value is greater, less than or equal to another. |
