实施的关键程序唤醒

Incertainapplications,thePIC16CXXXisexercised

onlywhenakeyispressed,(e.g.,remotekeyless

entry).Insuchapplications,thebatterylifecanbe

extendedbyputtingthePIC16CXXXtosleepduring

inactivestatesandwhenakeyispressed,the

PIC16CXXXwakesup,performsthetask,andthen

goesbacktosleep.AN528ImplementingWake-uponKeyStrokearebothsettoalowlogiclevel.Inthisstate,thecapac-Author:StanD’SouzaitorCisfullychargedandahighlogiclevelispresentatMicrochipTechnologyInc.theMCLRpin.Whenakeyispressed,CdischargesthrougheitherR2orR3(dependingonwhichswitchisbeingpressed).ThevoltageacrossCfallsrapidlyINTRODUCTION