Microcontroller
A microcontroller is a complete microprocessor system ,containing of microprocessor ,limited amount of ROM RAM and parallel I/O ports ,built on a single integrated circuit . Microcontroller is in fact a microcomputer ,but it is called so because it is used to perform control functions . Expanded features of 8052 over 8051 microcontroller are as follows: a) ROM :- Microcontroller 8052 has 8 KB bytes onboard ROM or EPROM whereas 8051 has 4 KB bytes of ROM . b) RAM :- Microcontroller 8052 has 256 bytes of onboard RAM whereas 8051 has 128 bytes of RAM. c) Time event counter :- 8052 has an extra 16 bit time event counter whereas 8051 has a dual 16 bit time event counter.