Question: Which addressing mode uses a register to specify the address of an instruction operand in memory: Indexed, Register, PC relative, or Immediate? List 4 things

Which addressing mode uses a register to specify the address of an instruction operand in memory: Indexed, Register, PC relative, or Immediate?

List 4 things that the processor's control unit does.

Why does a CPU need registers that are not accessible or programmable by a programmer?

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