TMS320x2802x eCAP捕获参考指南
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TMS320F2802xPiccoloEnhancedCapture
(eCAP)Module
ReferenceGuide
LiteratureNumber:SPRUFZ8March20092SPRUFZ8–March2009SubmitDocumentationFeedbackContentsPreface........................................................................................................................................61Introduction.........................................................................................................................82Description..........................................................................................................................83CaptureandAPWMOperatingMode......................................................................................94CaptureModeDescription...................................................................................................10
4.1EventPrescaler..........................................................................................................10
4.2EdgePolaritySelectandQualifier....................................................................................11
4.3Continuous/One-ShotControl..........................................................................................11
4.432-BitCounterandPhaseControl....................................................................................12
4.5CAP1-CAP4Registers..................................................................................................13
4.6InterruptControl..........................................................................................................13
4.7ShadowLoadandLockoutControl...................................................................................14
4.8APWMModeOperation................................................................................................15
5CaptureModule-ControlandStatusRegisters.....................................................................16
6RegisterMapping...............................................................................................................24
7ApplicationoftheECAPModule.........................................................................................24
7.1Example1-AbsoluteTime-StampOperationRisingEdgeTrigger..............................................25
7.2Example2-AbsoluteTime-StampOperationRisingandFallingEdgeTrigger................................28
7.3Example3-TimeDifference(Delta)OperationRisingEdgeTrigger............................................30
7.4Example4-TimeDifference(Delta)OperationRisingandFallingEdgeTrigger..............................32
8ApplicationoftheAPWMMode............................................................................................34
8.1Example1-SimplePWMGeneration(IndependentChannel/s).................................................34
SPRUFZ8–March2009TableofContents3SubmitDocumentationFeedbackwww.ti.com
ListofFigures
1CaptureandAPWMModesofOperation.................................................................................92CaptureFunctionDiagram................................................................................................103EventPrescaleControl....................................................................................................114PrescaleFunctionWaveforms............................................................................................115DetailsoftheContinuous/One-shotBlock..............................................................................126DetailsoftheCounterandSynchronizationBlock.....................................................................137InterruptsineCAPModule................................................................................................148PWMWaveformDetailsOfAPWMModeOperation..................................................................159Time-StampCounterRegister(TSCTR)................................................................................1610CounterPhaseControlRegister(CTRPHS)...........................................................................1611Capture-1Register(CAP1)..............................................................................................1612Capture-2Register(CAP2)...............................................................................................1613Capture-3Register(CAP3)...............................................................................................1714Capture-4Register(CAP4)...............................................................................................1715ECAPControlRegister1(ECCTL1).....................................................................................1716ECAPControlRegister2(ECCTL2).....................................................................................1917ECAPInterruptEnableRegister(ECEINT).............................................................................2118ECAPInterruptFlagRegister(ECFLG).................................................................................2219ECAPInterruptClearRegister(ECCLR)................................................................................2220ECAPInterruptForcingRegister(ECFRC).............................................................................2321CaptureSequenceforAbsoluteTime-stampandRisingEdgeDetect..............................................2622CaptureSequenceforAbsoluteTime-stampWithRisingandFallingEdgeDetect...............................2823CaptureSequenceforDeltaModeTime-stampandRisingEdgeDetect..........................................3024CaptureSequenceforDeltaModeTime-stampWithRisingandFallingEdgeDetect...........................3225PWMWaveformDetailsofAPWMModeOperation...................................................................34