8051 has the following features they are:

   1.4096 bytes of on-chip program memory

   2.128 bytes on-chip data memory

   3.Four register banks

   4.128 user defined software software flags

   5.32 bidirectional I/O lines organised as four 8-bit ports

   6.Two multiple modes ,16-bit timers/counters

   7.Two level prioritized interrupt structure

   8.Binary or decimal arthematic