What is the main difference between microcontroller and microprocessor?

A microcontroller has a Microprocessor, Input/Output, and memory on one chip. A Microprocessor is just that alone, requiring separate I/O and memory circuitry to be useful. A "System on a chip" is kind of halfway between, in that it has the microprocessor and I/O, and maybe a DSP in one package, but still uses external memory.

Sometimes the I/O and processing s very specific, such as the chips may digital TV set-top-boxes are made from. More.

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