Like vtol-ronit I am also using FreeRTOS & F407, looking at section 18.104.22.168 of the Manual doesn't help. Are you able to say what sources the Reason value. Is it built into SystemView, or is it passed from the target to SystemView. Having searched through both FreeRTOS and SEGGER code without able to trace the source of the reason value so suspect it is coming directly from SystemView. Any thoughts/wisdom gratefully accepted.