93系列串行EEPROM芯片与单片机串行接口

Systemsrequiringembeddedcontrolarebecoming

moreandmoresophisticated,withmicrocontrollers

requiredtocontrolthesesystemsincreasingin

complexity.Manymicrocontrollerstodayarebeing

designedwithbuilt-inserialcommunicationcapability

tobeabletoeasilyaccessotherfeaturesthatarenot

builtintothemicrocontrolleritself.Deviceslike

EEPROMs,A/Ds,D/As,LCDsetc.areallbeingbuilt

withaserialinterfacetoreducecost,size,pincount,

andboardarea.Therearemanydifferentserial

interfacesonthemarketusedtointerfaceperipherals

(I

2

C



,Microwire



,SPI,forexample).Oneoftheserial

interfacesthatisgaininginpopularityisSPI(Serial

PeripheralInterface).Itisbecomingmorepopular

becauseofitscommunicationspeed,simultaneous

full-duplexcommunication,andeaseofprogramming.AN613UsingMicrochip93SeriesSerialEEPROMswithMicrocontrollerSPIPortstomakesureitwrites(pollingready/busypintoverifyAuthor:KeithPazulwritecyclecompletion)andreadsproperly.AMemoryandASSPDivisionschematic(Figure2)isincludedinthisapplicationnotetodescribeexactlyhowthe93LC56/66wasconnectedtothemicrocontroller.INTRODUCTIONSystemsrequiringembeddedcontrol