\begin{split}
f_{main\_clock}&=SystemCoreClock\times{SYSAHBCLKDIV}\\
&=16\times baudrate\times{DL}\times{UARTCLKDIV}\\
{DL}&=\frac{SystemCoreClock\times{SYSAHBCLKDIV}}{{UARTCLKDIV}\times16\times baudrate}
\end{split}
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