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Trip-Zone(TZ)Submodule
Table2-18.PossibleActionsOnaTripEvent
TZCTL[TZA]EPWMxAComment
and/orand/or
TZCTL[TZB]EPWMxB
0,0High-ImpedanceTripped
0,1ForcetoHighStateTripped
1,0ForcetoLowStateTripped
1,1NoChangeDoNothing.
Nochangeismadetotheoutput.
Example2-8.Trip-ZoneConfigurations
ScenarioA:
Aone-shottripeventonTZ1pullsbothEPWM1A,EPWM1BlowandalsoforcesEPWM2Aand
EPWM2Bhigh.
•ConfiguretheePWM1registersasfollows:
–TZSEL[OSHT1]=1:enablesTZ1asaone-shoteventsourceforePWM1
–TZCTL[TZA]=2:EPWM1Awillbeforcedlowonatripevent.
–TZCTL[TZB]=2:EPWM1Bwillbeforcedlowonatripevent.
•ConfiguretheePWM2registersasfollows:
–TZSEL[OSHT1]=1:enablesTZ1asaone-shoteventsourceforePWM2
–TZCTL[TZA]=1:EPWM2Awillbeforcedhighonatripevent.
–TZCTL[TZB]=1:EPWM2Bwillbeforcedhighonatripevent.
ScenarioB:
Acycle-by-cycleeventonTZ5pullsbothEPWM1A,EPWM1Blow.
Aone-shoteventonTZ1orTZ6putsEPWM2Aintoahighimpedancestate.
•ConfiguretheePWM1registersasfollows:
–TZSEL[CBC5]=1:enablesTZ5asaone-shoteventsourceforePWM1
–TZCTL[TZA]=2:EPWM1Awillbeforcedlowonatripevent.
–TZCTL[TZB]=2:EPWM1Bwillbeforcedlowonatripevent.
•ConfiguretheePWM2registersasfollows:
–TZSEL[OSHT1]=1:enablesTZ1asaone-shoteventsourceforePWM2
–TZSEL[OSHT6]=1:enablesTZ6asaone-shoteventsourceforePWM1
–TZCTL[TZA]=0:EPWM1Awillbeputintoahigh-impedancestateonatripevent.
–TZCTL[TZB]=3:EPWM1Bwillignorethetripevent.
SPRU791D–November2004–RevisedOctober2007ePWMSubmodules61
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