steps. </p>
<p>The maximum system clock frequency at 250Mhz is configured in non-secure application.</p>
<h4 id="notes"><b>Notes</b></h4>
<ol>
<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 have higher priority (numerically lower)
than the peripheral interrupt. Otherwise the caller ISR process will b