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1.1 Systems Architecture, a register, or a memory location used to store…

- - - - holds the address of the current instruction that is to be fetched from memory, or the address in memory to which data is to be transferred.
    - - decodes the instruction and sends data and signals around the CPU that carry out (or execute) the instruction.
    - - Temporarily stores data that has been read or data that needs to be written.
  - - - An accumulator is an energy storage device: a device which accepts energy, stores energy, and releases energy as needed. Some accumulators accept energy at a low rate (low power) over a long time interval and deliver the energy at a high rate (high power) over a short time interval.