基于PDIUSBD12芯片扩展W78E58的USB接口-豆柴文库

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基于PDIUSBD12芯片扩展W78E58的USB接口
Introduction:
USB(UniversalSerialBus)technologyhasrevolutionizedthewayinwhichdataistransferredbetweenmachines.Itisahighlyreliable,scalable,andefficienttechnologythathaswidespreadapplicationstoday.OneofthekeydriversoftheuniversaladoptionofUSBisitseaseofuseandflexibility.USBdevicescaneasilybeinterconnectedtocreateanetworkofdevicesthatcansendandreceivedataeasily.OneoftheavailableoptionsforimplementingUSBconnectivityinmicrocontroller-basedsystemsisthePDIUSBD12chip.ThispaperdiscussestheapplicationofthePDIUSBD12chiptoextendW78E58'sUSBinterface.
PDIUSBD12ChipOverview:
ThePDIUSBD12chipisaUSBhostanddevicecontrollerthatprovidesacompleteUSBinterfacetomicrocontrollerdevices.Ithasahigh-speedUSB2.0controllerthatsupportsfull-speed(12Mbps)andlow-speed(1.5Mbps)modes.ThePDIUSBD12chipisdesignedtohandleallthelow-levelUSBinterfaceprotocols,enablinghostanddeviceoperationwithminimalinterventionfromthemicrocontroller.Ithasan8-bitparallelinterfacethatconnectstothemicrocontrollerforcontrolanddatatransfer.
W78E58MicrocontrollerOverview:
TheW78E58microcontrollerisa8-bitMCS-51compatiblemicrocontrollerwithanin-systemprogramming(ISP)feature.Ithas64kBofflashmemory,1kBofdatamemory,and2kBofEEPROM.Italsohasarichsetofperipheralfunctions,includingaUART,atimer,anI2Cbusinterface,andan8-bitADC.
ExtendingW78E58'sUSBInterfaceusingPDIUSBD12Chip:
Formanyapplications,itisnecessarytohaveaUSBinterfacefordatatransfer,whichisnotavailablenativelyonmostmicrocontrollers,includingtheW78E58.ByaddingaUSBinterfaceusingthePDIUSBD12chip,theW78E58cancommunicatewithUSBdevices,suchasUSBflashdrives,printers,andotherUSB-compliantdevices.ThePDIUSBD12chipcanbeinterfacedwiththeW78E58usingthe8-bitparallelinterface.
ThefirststepinimplementingtheUSBinterfaceistoconnectthePDIUSBD12chiptotheW78E58microcontrollerusingan8-bitparallelinterface.ThisinterfaceisusedtoconfigurethePDIUSBD12chipandsenddatatoandfromtheUSBinterface.OncethePDIUSBD12chipisconnectedtothemicrocontroller,thenextstepistoconfigureitforusewith