Answer Posted / sahitya

Microprocessor is a normal CPU (Central Processing Unit) as you can find in a PC. Communication with external devices is achieved via a data bus, hence the chip mainly features data
and address pins as well as a couple of control pins. All peripheral devices (memory, floppy controller, USB controller, timer, . . . ) are connected to the bus. A microprocessor cannot be operated stand-alone, at the very least it requires some memory and an output device to be useful.

A microcontroller already contains all components which allow it to operate standalone,and it has been designed in particular for monitoring and/or control tasks. In consequence,in addition to the processor it includes memory, various interface controllers, one or more timers, an interrupt controller, and last but definitely not least general purpose I/O pins which allow it to directly interface to its environment. Microcontrollers also include bit operations which allow you to change one bit within a byte without touching the other bits.

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