The UART interface does not use a clock signal to synchronize the transmitter and receiver devices; it transmits data asynchronously. Instead of a clock signal, the transmitter generates a bitstream based on its clock signal while the receiver is using its internal clock signal to sample the incoming data.

Is UART synchronous or asynchronous?

A universal asynchronous receiver-transmitter (UART /ˈjuːɑːrt/) is a computer hardware device for asynchronous serial communication in which the data format and transmission speeds are configurable.

What type of protocol is UART protocol?

UART is a single-master, single-slave protocol, where one device is set up to communicate with only one partner. 2. Data travels to and from a UART in parallel to the controlling device (e.g., a CPU).