A micro processor is commonly thought to be the central processing unit of a computer system. This CPU may contain peripheral devices on the same chip, and connects to peripheral devices located on different chips.
Thus, a micro processor is not commonly thought to be a peripheral.
However, a micro processor is often used to create a peripheral device. For example, a hard disk drive is a peripheral device to your PC's CPU. However, the electronics within that hard disk drive itself may contain another micro processor. This micro processor acts as the CPU within the realm of the hard disk drive, but towards the total PC system, it implements a peripheral device of the central processing unit.
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