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TMS320F280025: Why does deadband influence software forced event in280025

Part Number: TMS320F280025


 I am using 280025.When I start to debug the epwm module half month ago,I have found a puzzled problem.When I forced both the EPWM1A and EPWM1B to low,if I didnt disable the deadband,although I had forced the EPWM1B to low,but EPWM1B output high.Since the software foce event have the highest priority,I think no matter whether deadband exists or not,if I force both the EPWM1A and EPWM1B to low,they are supposed to output low.

 At the present,If I want to force both the EPWM1A and EPWM1B to low,I have to disable the deadband firstly.And When I need to change EPWM1A and EPWM1B to couter compare mode,I have to enable the deadband again.Could you give me some advice so that I can force both the EPWM1A and EPWM1B to low without disabling the deadband.