Source : Free On-Line Dictionary of Computing

microcontroller
     
         A {microprocessor} on a single {integrated
        circuit} intended to operate as an {embedded} system.  As well
        as a {CPU}, a microcontroller typically includes small amounts
        of {RAM} and {PROM} and timers and I/O ports.
     
        An example is the {Intel 8751}.
     
        (1995-04-22)