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I need to do the following senerio,
when there is no input at the portA,3 (the output of portA,3 is portB,3) for 5 minutes the system must reset automatically,
friends, are you having any Idea to fulfill the condition.
thanks
Saran

Hello Saran

Maybe the watchdog timer would be useful for providing this reset function. Refer to the device datasheet under special features of the CPU. Other then this you can use a software reset eg a goto or a jump that tales the program back to the start.