Microprocessor & Microcontroller

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 Comparison 

MicroprocessorMicrocontroller
Since memory and I/O are connected externally, the circuit becomes large in size.Since memory and I/O are present together, the internal circuit is small in size.
It cannot be used in compact systemsIt can be used in compact systems.
Cost is highCost is low
It is not suitable for devices that run on stored power since total power consumption is high due to external components.It can be used on devices that use stored power since total power consumption is low due to less external components.
RAM, ROM, I/O units, and other peripherals are not embedded on a single chip.RAM, ROM, CPU and other peripherals are embedded on a single chip.
Do not have power saving mode.Have a power-saving mode.
Used in personal computers.Used in embedded systems.
Less number of registers.More number of registers. 
Uses an external bus.Uses an internal controlling bus.
Based on the Von Neumann modelBased on the Harvard architecture
It is a central processing unit on a single silicon-based integrated chip.It is a byproduct of the development of microprocessors with a CPU along with other peripherals.
Complex and expensive due to a large number of instructions to process.Simple and inexpensive due to less number of instructions to process.
Can run at a very high speed.Can run up to 200MHz or more.

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