• A microprocessor system is made up of data input, storage, processing, and output devices that are all controlled by a central processing unit (CPU).
• A desktop PC's main unit is a modular system that includes the motherboard, power supply, and disc drives.
• They are made up of the following key elements:
• Central Processing Unit: It executes a computer system's instructions.
• Registers: They hold pieces of data in such a way that they can all be written to or read out at the same time.
• System clock: a basic count of how many ticks have passed since some arbitrary starting date, known as the Epoch.

Read More: Why registers are used inside of microprocessors?