Architecture (System Basics)
CPU is an acronym for Central Processing Unit. The CPU is the central component of the computer, the brain if you will.
The CPU is made up of three main areas, the Arithmetic Logic Unit which carries out all calculations, the Bus Interface Unit which takes the data to and from the CPU (held inside its internal 'registers' - i.e. small memory stores) along the external Data Bus to read/write memory and devices. The Data Bus is a two-way bus, as it must carry information in both directions. The Bus Interface Unit also places the required location addresses on to the Address Bus, in order that the required devices can be accessed for reading or writing.
The Control Unit - Decodes all program instructions and dictates all the CPU's control and timing mechanisms.
Architecture (System Basics)
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