标签: wake-up

Incertainapplications,thePIC16CXXXisexercisedonlywhenakeyispressed,(e.g.,remotekeylessentry).Insuchapplications,thebatterylifecanbeextendedbyputtingthePIC16CXXXtosleepduringinactivestatesandwhenakeyispressed,thePIC16CXXXwakesup,performsthetask,andthengoesbacktosleep.AN528ImplementingWake-uponKeyStrokearebothsettoalowlogiclevel.Inthisstate,thecapac-Author:StanD’SouzaitorCisfullychargedandahighlogiclevelispresentatMicrochipTechnologyInc.theMCLRpin.Whenakeyispressed,CdischargesthrougheitherR2orR3(dependingonwhichswitchisbeingpressed).ThevoltageacrossCfallsrapidlyINTRODUCTION……