These devices combine four popular functions, Power-onReset Control, Watchdog Timer, Supply Voltage Supervision,and Block Lock Protect Serial EEPROM Memory in onepackage. This combination lowers system cost, reducesboard space requirements, and increases reliability.Applying power to the device activates the power-on resetcircuit which holds RESET/RESET active for a period oftime. This allows the power supply and oscillator to stabilizebefore the processor executes code.The Watchdog Timer provides an independent protectionmechanism for microcontrollers. When the microcontrollerfails to restart a timer within a selectable time out interval,the device activates the RESET/RESET signal. The userselects the interval from three preset values. Once selected,the interval does not change, even after cycling the power.
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