MICROPROCESSOR AND MICROCONTROLLER

Detailed explanation-1: -The MCLR is an active low input. This means that the pin will be activated when the voltage at that pin will be a zero or low in positive logic; in English this means when the pin is between 0V and 0.8V. You can identify active low input by the bar above the MCLR. It’s located at pin 4.

Detailed explanation-2: -By setting the WDT (Watchdog Timer) without disabling periodically (not calling the CLRWDT instruction), your PIC will reset after a short delay. By calling a recursive function that will cause an internal stack overflow. It has depth of 8 so this will be rapid.