have higher priority (numerically lower) than the peripheral interrupt. Otherwise the caller ISR process will be blocked. To change the SysTick interrupt priority you have to use HAL_NVIC_SetPriority() function.</p></li>
<li><p>The application needs to ensure that the SysTick time base is always set to 1 millisecond to have correct HAL operation.</p></li>
</ol>
<h3 id="keywords"><b>Keywords</b></h3>
<p>Power, PWR, Standby mode, Interrupt, EXTI, Wakeup, Low Power, RTC, External reset, LSI,</p>
<h3 id="direct