基于PIC16C5X LCD控制器

ThisapplicationnotedescribesanLCDcontroller

implementationusingaPIC16C55microcontroller.This

techniqueoffersdisplaycapabilitiesforapplications

thatrequireasmalldisplayatalowcost,togetherwith

thecapabilitiesofthestandardPIC16C55microcontrol-

ler.WestartbyanoverviewofLCDdevicesandtheir

theoryofoperationfollowedbysoftwareimplementa-

tionissuesofthecontroller.Thesourcecodeforcon-

trollingamultiplexedLCDdisplayisincludedin

AppendixA.AN563UsingPIC16C5XMicrocontrollersasLCDDriversToturnanLCDsegment“on,”whichmakestheAuthor:AlLovrichsegmentturndarkoropaque,anLCDRMSvoltageMicrochipTechnologyInc.thatisgreaterthantheLCDthresholdvoltageisappliedtotheLCD.TheRMSLCDvoltageistheRMSvoltageINTRODUCTIONacrossthecapacitorCinFigure1,whichisequaltothe