universal synchronous receiver/transmitter (USRT)
A Universal Synchronous Receiver/Transmitter(USRT) is an electronic circuit that handles the conversion of parallel data to serial data form for transmission over a synchronous data channel. In this type of transmission, no start and stop codes are required because the receiving device automatically detects the start and end of a data packet.
The corresponding asynchronous transmitting circuit is the Universal Asynchronous Receiver/Transmitter( UART).