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U2 Flashcards
Cards in this deck (12)
- 1PC info-Program Counter
-stores the address of the next instruction to be fetched - 2CIR info-Current Instruction Register
-stores the instruction being executed - 3ACC info-Accumulator
-stores values being processed - 4MAR info-Memory Address Register
-stores the address to be read/written in main memory - 5MDR info-Memory Data Register
-stored data to be read/written to main memory - 6ALU info-Arithmetic Logic Unit
-performs mathematical and logical operations - 7CU / Clock info-Control Unit
-decodes the instruction in the CIR
-selects machine resources and operations
-coordinates activation of operations - 8Input and Output Devices-allow the user to interface with the CPU
-eg keyboards, mouses, monitors and speakers - 9Fetch-Execute Cycle steps1. memory address in PC is copied into MAR
2. instruction in address copied to MDR
3. instruction copied to CIR
4. PC is incremented for next instruction
5. CIR instruction is decoded and executed by CU (potentially using ALU) - 10Clock Speed info-faster speed = more instructions execute in a second
-power needed + heat (can damage processor) - 11Core Number info-cores are processing units
-multiple cores means multiple instructions executed at once
-limited by instructions that need specific orders + cost - 12Cache Size info-faster memory than RAM
-used for frequently requested data/instructions
-more cache = less instructions fetched from RAM
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- GCSE Computing Flashcards on U2 Flashcards, created by A Tomalin on 08/03/2022.
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- A Tomalin
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