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2.5Dead-BandGenerator(DB)Submodule
CTR = CMPB
CTR = CMPA
CTR_Dir
CTR = 0
CTR = PRD
Dead
Band
(DB)
Counter
Compare
(CC)
Action
Qualifier
(AQ)
EPWMxA
EPWMxB
CTR = CMPB
CTR = 0
EPWMxINT
EPWMxSOCA
EPWMxSOCB
EPWMxA
EPWMxB
TZ1
to TZ6
CTR = CMPA
Time-Base
(TB)
CTR = PRD
CTR = 0
CTR_Dir
EPWMxSYNCI
EPWMxSYNCO
EPWMxTZINT
PWM-
chopper
(PC)
Event
Trigger
and
Interrupt
(ET)
Trip
Zone
(TZ)
GPIO
MUX
ADC
PIE
PIE
2.5.1PurposeoftheDead-BandSubmodule
2.5.2ControllingandMonitoringtheDead-BandSubmodule
Dead-BandGenerator(DB)Submodule
Figure2-27illustratesthedead-bandsubmodulewithintheePWMmodule.
Figure2-27.Dead_BandSubmodule
The"Action-qualifier(AQ)Module"sectiondiscussedhowitispossibletogeneratetherequired
dead-bandbyhavingfullcontroloveredgeplacementusingboththeCMPAandCMPBresourcesofthe
ePWMmodule.However,ifthemoreclassicaledgedelay-baseddead-bandwithpolaritycontrolis
required,thenthedead-bandsubmoduledescribedhereshouldbeused.
Thekeyfunctionsofthedead-bandmoduleare:
•Generatingappropriatesignalpairs(EPWMxAandEPWMxB)withdead-bandrelationshipfroma
singleEPWMxAinput
•Programmingsignalpairsfor:
–Activehigh(AH)
–Activelow(AL)
–Activehighcomplementary(AHC)
–Activelowcomplementary(ALC)
•Addingprogrammabledelaytorisingedges(RED)
•Addingprogrammabledelaytofallingedges(FED)
•Canbetotallybypassedfromthesignalpath(notedottedlinesindiagram)
Thedead-bandsubmoduleoperationiscontrolledandmonitoredviathefollowingregisters:
Table2-12.Dead-BandGeneratorSubmoduleRegisters
RegisterNameAddressoffsetShadowedDescription
DBCTL0x000FNoDead-BandControlRegister
DBRED0x0010NoDead-BandRisingEdgeDelayCountRegister
DBFED0x0011NoDead-BandFallingEdgeDelayCountRegister
ePWMSubmodules 50SPRU791D–November2004–RevisedOctober2007
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