s used to select the RTC clock source; in this case the Backup domain will be reset in<br />
order to modify the RTC Clock source, as consequence RTC registers (including the backup registers) and RCC_CSR register are set to their reset values.</p></li>
<li><p>Care must be taken when using HAL_Delay(), this function provides accurate delay (in milliseconds) based on variable incremented in SysTick ISR. This implies that if HAL_Delay() is called from a peripheral ISR process, then the SysTick interrupt must 