Difference between revisions of "Central Processing Unit"
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Instructions include data-handling instructions (such as arithmetic and logical operations), and control instructions (such as jumps, both conditional and un-conditional). | Instructions include data-handling instructions (such as arithmetic and logical operations), and control instructions (such as jumps, both conditional and un-conditional). | ||
| − | The CPU also usually contains a number of registers (storage for data inside the CPU, instead of in the main memory). One special register indicates where the current/next instruction is to be fetched from (although there have been computers which kept this information in a specific location in main memory). CPUs also typically include registers for holding data which is being worked on: early computers often had only one, called the accumulator; and there have been computers without any such data registers. | + | The CPU will contain an [[Arithmetic logic unit|ALU]], which is where any computation (arthmetical or logical) is performed. The CPU also usually contains a number of registers (storage for data inside the CPU, instead of in the main memory). |
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| + | One special register indicates where the current/next instruction is to be fetched from (although there have been computers which kept this information in a specific location in main memory). CPUs also typically include registers for holding data which is being worked on: early computers often had only one, called the '''accumulator'''; and there have been computers without any such data registers. | ||
Finally, CPUs usually contain means for controlling the devices attached to the computer; reading data from, and writing data to, them. | Finally, CPUs usually contain means for controlling the devices attached to the computer; reading data from, and writing data to, them. | ||
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Revision as of 14:51, 19 August 2017
The Central Processing Unit, usually abbreviated as CPU, is the 'brain' of a computer - the unit which controls the operation of the entire computer, by reading instructions from main memory and executing them.
Instructions include data-handling instructions (such as arithmetic and logical operations), and control instructions (such as jumps, both conditional and un-conditional).
The CPU will contain an ALU, which is where any computation (arthmetical or logical) is performed. The CPU also usually contains a number of registers (storage for data inside the CPU, instead of in the main memory).
One special register indicates where the current/next instruction is to be fetched from (although there have been computers which kept this information in a specific location in main memory). CPUs also typically include registers for holding data which is being worked on: early computers often had only one, called the accumulator; and there have been computers without any such data registers.
Finally, CPUs usually contain means for controlling the devices attached to the computer; reading data from, and writing data to, them.
