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3.2.20serialportperipherals
3.3registermap
tms320f2808,tms320f2806
tms320f2801,ucd9501
DigitalSignalProcessors
SPRS230F–OCTOBER2003–REVISEDSEPTEMBER2005
eqep:theenhancedqepperipheralusesa32-bitpositioncounter,supportslow-速
measurementusingcaptureunitandhigh-speedmeasurementusinga32-bitunittimer.
Thisperipheralhasawatchdogtimertodetectmotorstallandinputerrordetectionlogic
toidentifysimultaneousedgetransitioninqepsignals.
模数转换器:theadcblockisa12-bitconverter,singleended,16-途径.itcontainstwo
样本-和-holdunitsforsimultaneoussampling.
the280xdevicessupportthefollowingserialcommunicationperipherals:
ecan:thisistheenhancedversionofthecanperipheral.itsupports32mailboxes,时间
stampingofmessages,andiscan2.0b-一致的.
spi:thespiisahigh-速,synchronousseriali/oportthatallowsaserialbitstreamof
programmedlength(onetosixteenbits)tobeshiftedintoandoutofthedeviceata
programmablebit-transferrate.正常情况下,thespiisusedforcommunicationsbetweenthe
dspcontrollerandexternalperipheralsoranotherprocessor.typicalapplicationsinclude
externali/oorperipheralexpansionthroughdevicessuchasshiftregisters,显示
驱动器,andadcs.multi-devicecommunicationsaresupportedbythemaster/从动装置
operationofthespi.onthe280x,thespicontainsa16-levelreceiveandtransmitfifo
forreducinginterruptservicingoverhead.
sci:theserialcommunicationsinterfaceisatwo-wireasynchronousserialport,commonly
knownasuart.onthe280x,thescicontainsa16-levelreceiveandtransmitfifofor
reducinginterruptservicingoverhead.
I
2
c:theinter-integratedcircuit(i
2
c)moduleprovidesaninterfacebetweenadspandother
devicescompliantwithphilipssemiconductorsinter-icbus(i
2
c-总线)specificationversion
2.1andconnectedbywayofani
2
c-总线.externalcomponentsattachedtothis2-线
serialbuscantransmit/receiveupto8-bitdatato/fromthedspthroughthei
2
cmodule.
onthe280x,thei
2
ccontainsa16-levelreceiveandtransmitfifoforreducinginterrupt
servicingoverhead.
the280xdevicescontainthreeperipheralregisterspaces.thespacesarecategorizedasfollows:
peripheraltheseareperipheralsthataremappeddirectlytothecpumemorybus.
frame0:看table3-6
peripheraltheseareperipheralsthataremappedtothe32-bitperipheralbus.
Frame1Seetable3-7
peripheraltheseareperipheralsthataremappedtothe16-bitperipheralbus.
frame2:看table3-8
FunctionalOverview
33
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