The microprocessor is an integrated circuit that contains millions of transistors interconnected by small aluminium wires. The microprocessor's processing capabilities control and direct the activities of the PC by interacting with the other electronic components on the motherboard.
The bus carries the various signals, addresses and data that move between the PC's components. Bus structures have different sizes (width), ranging from 16 to 64 bits (data channels) on modern microprocessors. The larger the size of the bus the more data can be moved at the same time.
Main bus structures:
|Data bus||Carries data to and from the CPU, main memory, and peripheral devices.|
|Address bus||Carries addresses of data and instructions between memory and the CPU.|
|Control bus||Carries control information, such as the status of the devices, between the CPU and other devices.|