firmware

UART Baud Rate

STM32 BRR register value, achieved baud rate, and error % for any clock/baud pair.

Inputs — STM32 USART (OVER8=0)

System Clock f_CK

Desired Baud Rate

Results

BRR Register—

BRR (decimal)—

Actual Baud Rate—

Baud Error—

BRR = round(f_CK / baud) · err = |f_CK/BRR − baud| / baud