Abstract :

Universal Asynchronous Receiver Transmitter (UART) is a serial communication interface used to transfer data between serial I/O device and the microcomputer system . UART accepts data characters from CPU in parallel form and converts them to a continuos serial data stream for serial transmission. Simultaneously it can receive serial data stream and convert to parallel data character to CPU . The UART will signal whenever it can accept a new character for transmission or whenever it has received a character for CPU. The CPU can read complete status of UART anytime.