标签: 门狗定时器

Almostalltemperaturesensorcircuitsusesomeformofdiscretecomponent(suchasathermistororasolid-statesensor)toactuallymeasuretheenvironment’stemperature.Itislefttothemicrocontrollertointerpretthereadingintoahuman-friendlyformfortheuser’sbenefit.Itispossible,however,todesignadigitalthermometerwithoutanexternalsensor,byusingatemperaturesensitivepropertyofthemicrocontrolleritself.ThisApplicationNoteshowshowtousetheWatchdogTimer(WDT)ofaPICmicro®microcontrollerfortem-peraturemeasurement.MAN828MeasuringTemperaturewiththePIC16F84AWatchdogTimerAuthor:LeenaChaudhariTHEORYOFOPERATIONMicrochipTechnologyInc.TheWDTonallPICmicromicrocontrollershasanomi-naltime-outperiodof18ms.TheWDTtime-outperiodvarieswithtemperature,VDDandpart-to-partprocessINTRODUCTION……