An X4 event is logged when the controller reboots due to one of two conditions monitored by the watchdog chip:
•Low Power Condition: If the supply voltage drops below a safe threshold, the watchdog triggers a reset to prevent unpredictable operation. Running below minimum voltage can cause erratic behavior or malfunction.
•Unresponsive Controller: If the controller fails to reset the watchdog within the expected time typically due to software exceptions or excessive electrical noise, the watchdog assumes the system is unresponsive and initiates a reboot.
In either case, the controller logs an X4 event upon the next power-up to indicate a watchdog-triggered reset. Log example below.
•Low Power Condition: If the supply voltage drops below a safe threshold, the watchdog triggers a reset to prevent unpredictable operation. Running below minimum voltage can cause erratic behavior or malfunction.
•Unresponsive Controller: If the controller fails to reset the watchdog within the expected time typically due to software exceptions or excessive electrical noise, the watchdog assumes the system is unresponsive and initiates a reboot.
In either case, the controller logs an X4 event upon the next power-up to indicate a watchdog-triggered reset. Log example below.