OCR Computing - Registers

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  • Created by: Denise24
  • Created on: 09-03-14 12:57
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  • Registers
    • Registers
      • Fast
      • Temporary memory storage in the CPU
      • 2 types
        • Special/ Specific Purpose
        • General Purpose
    • ACC
      • Holds data currently being processed
      • Results of the processing are stored in the accumulator
      • The results of arithmetic carried out in the ALU
      • All I/O goes through the accumulator
    • MAR
      • Stores the memory address from which data will be fetched to the CPU or the address to which data will be sent and stored
      • holds the memory location of data that needs to be accessed
    • CIR/ IR
      • Holds the instruction while it is being decoded/executed
      • The contents of MDR are copied into the CIR if it is an instruction
      • Operation code as first part of instruction
      • Remainder of instruction is address of data to be used in operation or
        • The data to be used if immediate operand is used
  • CIR/ IR
    • Holds the instruction while it is being decoded/executed
    • The contents of MDR are copied into the CIR if it is an instruction
    • Operation code as first part of instruction
    • Remainder of instruction is address of data to be used in operation or
      • The data to be used if immediate operand is used

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