Watchdog circuits for microcontroller and computer systems ( 3 ) :

The watchdog circuits used with microcontrollers are usuallybuilt in such way that the software running in the microcontrollerperiodically resets the watchdog circuit. If no watchdog circuit"reset" signal is received during a predetermined timeframe, thewatchog circuit will activate it's alarm output (which is usuallyused to reset the microcontroller circuit to start all over).Watchdog circuit then causes an alarm when the software crashed(whn software crashes, it does not anymore give out watchdog reset pulses).

• Universal watchdog fully controls � Preset   
• Watchdog circuit uses leftover gates - extremely simple watchdog circuti to be used with microcontrollers   
• Watchdog timer reboots PCs - watchdog timer reboot the computer if it runs astray, uses a PIC16C84 �C to provide the watchdog function   

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