Microcontrollerandmicroprocessorbasedsystemsrelyonpro-
cessorsupervisoryfunctionstoinsurestableoperation.Themost
basicofallthesefunctionsismanagingtheprocessorresetinput.
Toensurestableoperation,theprocessormustbeheldinreset
anytimesupplyvoltageisout-of-tolerance.Oncesupplyvoltage
isin-tolerance,theprocessormustbemaintainedinresetforan
additionaltimeperiodtoensureastablestart-up.Theprocessor
resetfunctionmaybecontainedon-boardtheprocessoritself,or
maybeexternallyimplementedusingdiscretecomponentsora
supervisorIC.AN802SelectingaProcessorResetICAuthor:PaulPaglia,VDDMicrochipTechnology,Inc.INTRODUCTIONVCCMicrocontrollerandmicroprocessorbasedsystemsrelyonpro-cessorsupervisoryfunctionstoinsurestableoperation.Themostbasicofallthesefunctionsismanagingtheprocessorresetinput.MCLRToensurestableoperation,theprocessormustbeheldinresetanytimesupplyvoltageisout-of-toler
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