Hello,
as i wrote in my previous post - you must ensure that all beans within your porject have unige level and priority within this level. To avoid receiving unhandled interrupt I just swicthed "Interrupt priority" property in TimerInt bean to another value than "level 3, priority witin level0" (that is already set in Asynchroserial bean). I have also corrected your project.
For more details please see chapter "13.3.6 Interrupt Control Registers (ICRnx)" in reference manual of M52221 MCU.
best regards
Vojtech Filip
Processor Expert Support Team