Start and stop bits are used for Synchronisation in serial data communication
To establish a serial communication link between the PC and the 8051.
Serial communication is often used either to control or to receive data from an embedded microprocessor. Serial communication is a form of I/O in which the bits of a byte begin transferred appear one after the other in a timed sequence on a single wire. Serial communication has become the standard for intercomputer communication. In this lab, we'll try to build a serial link between 8051 and PC using RS232.