p>
<ul>
<li>LED3 ON: configuration failed (system will go to an infinite loop)</li>
<li>LED1 toggling: system in Run mode</li>
<li>LED1 off : system in Standby mode</li>
</ul>
<p>These steps are repeated in an infinite loop.</p>
<p>Note: This example can not be used in DEBUG mode due to the fact that the Cortex-M33 core is no longer clocked during low power mode so debugging features are disabled.</p>
<h4 id="notes"><b>Notes</b></h4>
<ol type="1">
<li><p>Care must be taken when HAL_RCCEx_PeriphCLKConfig() i