Which of the following is not part of a MCU processor?

A microcontroller unit (MCU) is designed to perform specific tasks in embedded systems. Its primary components include essential elements such as the Arithmetic Logic Unit (ALU), which is responsible for executing arithmetic and logic operations. The data bus line is crucial as it facilitates communication between the microcontroller and other components, allowing for data transfer. The clock is another integral part of an MCU, as it provides the timing signals that synchronize operations within the processor.

The voltage regulator, however, is not part of the MCU itself. Instead, it is an external component that ensures the MCU receives a stable voltage level for proper operation. The regulator mitigates fluctuations in power supply, safeguarding the MCU from damage due to overvoltage or undervoltage conditions. This distinction is what makes the voltage regulator not a part of the MCU's core architecture, while the other components are essential for its function.