ernel reads the value of PRIGROUP to correctly set internal interrupt pre-emption priorities.</li>
<li>Allowed values for <b>PRIGROUP</b> are from 0 to 6. The PRIGROUP value 7 will cause RTX to fail.</li>
<li>The lowest two pre-emption priorities are reserved for RTX kernel, all remaining pre-emption priorities are available to be used in an application.</li>
<li>Do not change the priority used by the RTX kernel. If this cannot be avoided, ensure that the preempt priority of SysTick/PendSV is lower than SVC