spi总线工作的原理是什么

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第1个回答  2023-06-07

spi总线工作原理
SPI(SerialPeripheralInterface)isasynchronousserialcommunicationprotocolthatoperatesinfullduplexmode.ThebasicworkingprincipleofSPIinvolvesamasterdevicetransmittingdatatooneormultipleslavedevices,withtheslavesreceivingandtransmittingdatainparallel.
Themasterdevicegeneratesaclocksignalthatdeterminesthespeedofdatatransfer,andcontrolstheflowofdatathroughasetofsharedlinesknownastheMOSI(MasterOutSlaveIn)andMISO(MasterInSlaveOut)lines.Theslavesareselectedusingaseparateslaveselect(SS)lineforeachdevice.
InatypicalSPItransaction,themasterstartsthetransferbyassertingtheSSlineoftheselectedslave,thenitsendsthedataovertheMOSIlineandtheslavereceivesitontheMISOline.Thedatatransfercontinuesuntilthemasterde-assertstheSSline,signalingtheendofthetransaction.
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