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Set the Vddio2 Independent I/Os supply for the stm32L5xx soc.
This bit is mandatory to use PG[15:2]. Especiually for LPUART1 TxRx pins. This bit of the PWR CR2 is used to validate the V DDIO2 supply for electrical and logical isolation purpose. Signed-off-by: Francois Ramu <francois.ramu@st.com>
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