Registers

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  • REGISTERS
    • Accumulator
      • It is most frequently used register used to store data taken from memory. Its number varies from microprocessor to microprocessor.
    • General Purpose registers
      • Special purpose Registers: Users do not access these registers. These are used by computer system at the time of program execution
        • Memory Address Register (MAR): It stores address of data or instructions to be fetched from memory.
        • Memory Buffer Register (MBR): It stores instruction and data received from the memory and sent from the memory.
        • UntitInstruction Register (IR): Instructions are stored in instruction register. When one instruction is completed, next instruction is fetched in memory for processing.led
        • Program Counter (PC): It counts instructions.
    • Special purpose Registers
      • General purpose registers are used to store data and intermediate results during program execution. Its contents can be accessed through assembly programming.

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