3.1.3

Registers of the Central Processing Unit (CPU)

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Registers of the Central Processing Unit (CPU)

Registers that have a predetermined purpose in the central processing unit are known as special purpose registers.

Program Counter (PC)

Program Counter (PC)

  • Holds the memory location address of the next instruction to be performed by the CPU.
Accumulator (ACC)

Accumulator (ACC)

  • Holds the result of calculations and operations performed by the arithmetic logic unit (ALU).
Memory Address Register (MAR)

Memory Address Register (MAR)

  • Holds the address of the location in memory where data is to be retrieved or stored.
Memory Data Register (MDR)

Memory Data Register (MDR)

  • Holds the data that has been retrieved from memory, or that is about to be stored in memory.
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  1. 1
    What is the purpose of the program counter?Multiple choice
  2. 2
    In which register is the output of the arithmetic and logic unit stored?Multiple choice
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Central Processing Unit (CPU)

Factors Affecting CPU Performance