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9 Cards in this Set
- Front
- Back
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What is a Register?
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- Small area of memory within the the processor, where data or control information is temporarily stored
- Used because transferring data to and from register is a lot quicker than between the processor and the main memory |
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Program Counter (PC)
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- Stores address of next instruction
- Controls sequence of instructions executed - Is incremented after being read - Is altered as a result of a jump instruction |
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Memory Address Register (MAR)
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- Stores address in memory current being accessed
- Holds position in memory of location containing either the next piece if data to be read, or the instruction to be used |
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Memory Data Register (MDR)
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- Stores the data being transferred to or from memory
- Acts like a buffer between IAS and CPU |
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Current Instruction Register (CIR)
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- Stores the instruction currently being operated on
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Accumulator
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- Temporary store for the results of the last arithmetic or logical operation until it is decided what to do with the data
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Address Bus
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- Carries identification about where the data is being sent/coming from
- Necessary if large amounts of memory need to be used |
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Data Bus
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- Carries data being transmitted between areas of the processor
- Two-way bus as data can be transferred in either direction |
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Control Bus
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- Carries control signals from the control unit to allow synchronization of signals
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