The ERAD bus comparator units can be used to monitor CPU buses and ERAD supports such 8 comparator blocks. The activity monitored and detected by these units can be used to generate breakpoints, watch-points or an interrupt (RTOSINT). Bus comparator module events from different units can be combined using OR and AND logics to generate new events as required. The faults in the comparison block can be detected by configuring two comparator blocks to monitor same set of CPU buses continuously and combine them using OR. RTOS Interrupt cause can indicate if the interrupt is set in one of the block or both.