I. During program execution, the contents of the PC are regularly moved into theProcessor-memory interface.II. The Control circuitry controls what operation is performed by the ALU
Question
I. During program execution, the contents of the PC are regularly moved into theProcessor-memory interface.II. The Control circuitry controls what operation is performed by the ALU
Solution
I. During the execution of a program, the contents of the Program Counter (PC) are not regularly moved into the Processor-memory interface. Instead, the PC holds the memory address of the instruction that is currently being executed. After each instruction is executed, the PC is updated to point to the next instruction.
II. Yes, the Control Unit (CU) does control what operation is performed by the Arithmetic Logic Unit (ALU). The CU decodes the instruction that is to be executed and generates the appropriate control signals to the ALU to carry out the operation. The ALU then performs the operation and returns the result to the CU.
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