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The baud rate in UART communication defines the rate at which data is transmitted over the communication channel and is usually measured in bits per second (bps). A higher baud rate means that more data can be sent per second, allowing for faster data transfer. This, in turn, affects the frequency of sending data multiple times.
For example, if the baud rate is 9600 bps, the serial port can transmit up to 9600 bits of data per second. If you need to send a packet of data that is 960 bits long, it will take 100ms to send it at this baud rate. On the other hand, if the baud rate is 115200 bps, the same 960-bit packet can be sent in less than 10ms.
Therefore, the baud rate significantly affects the frequency of sending data multiple times in UART communication, and a higher baud rate can increase the speed and frequency of data transmission.