What is baud rate?
UART baud rate defines how many symbols are transmitted per second.
Clock divider
Microcontrollers generate UART baud rate by dividing a peripheral clock.
Baud error
Small baud error is usually acceptable, but large error can cause framing errors.
Practical checks
Both devices must use the same baud rate, data bits, parity and stop bits.
Design notes
For long cables or noisy environments, consider lower baud rates or RS-485 transceivers.
Use the calculator
Try the related tool and calculate your own values instantly.
Open UART Baud Rate Calculator