What is USART? 

USART (Universal Synchronous/Asynchronous Receiver/Transmitter) is a serial communication protocol that supports both synchronous and asynchronous data transmission. 

- **Synchronous Mode**: Uses a clock signal for timing, allowing for higher data rates and more precise communication.

- **Asynchronous Mode**: Transmits data without a clock signal, relying on start and stop bits to frame data, making it simpler and suitable for lower speeds.

USART is commonly used for serial communication in embedded systems and can be configured for various baud rates and data formats.