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9 Cards in this Set
- Front
- Back
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ALU Arithmetic Logic Unit |
The part of the CPU where data isprocessed and manipulated. Thisprocessing and manipulation normally consists of arithmetic operations orlogical comparisons allowing a program to make decisions. |
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Control Unit CU |
The part of the CPU that manages theexecution of instructions. The control unit fetches each instruction insequence, and decodes and synchronises it before executing it by sendingcontrol signals to other parts of the computer. |
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Register |
Tiny areas of extremely fastmemory located in the CPU normally designed for a specific purpose, where dataor control information is stored temporarily. |
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Program Counter PC |
A register in the control unitwhich holds the address of the next instruction to be executed. |
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Accumulator Acc |
A special register within theALU. It is used to hold the datacurrently being processed by the central processor. Any data to be processed is storedtemporarily in the accumulator, the results ending up back in the accumulatorbeing stored in the memory unit. |
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Memory Address Register MAR |
A register in the CPU that stores theaddress of the memory location currently in use. In the fetch phase, this would be the addressof the instruction being loaded; in the execute phase, it would be the addressof the data being used. |
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Memory Data Register MDR |
A register in the CPU that stores databeing transferred to and from the immediate-access store. It acts as a buffer,allowing the central processor and memory unit to act independently withoutbeing affected by minor differences in operation. A data item will be copied tothe MDR ready for use at the next clock pulse, when it can either be used bythe central processor or be stored in main memory. |
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Current Instruction Register CIR |
A register in the control unit thatstores the address of the next instruction currently being executed and decoded. |
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Busses |
A common physical pathway sharedby signals to and from several components of a computer. |
