<P> The control unit (CU) is a component of a computer's central processing unit (CPU) that directs the operation of the processor . It tells the computer's memory, arithmetic / logic unit and input and output devices how to respond to a program's instructions . </P> <P> It directs the operation of the other units by providing timing and control signals . Most computer resources are managed by the CU . It directs the flow of data between the CPU and the other devices . John von Neumann included the control unit as part of the von Neumann architecture . In modern computer designs, the control unit is typically an internal part of the CPU with its overall role and operation unchanged since its introduction . </P>

Where do the control units instructions come from