Hi Marlyn Please see the picture below: I think with my setting, the CMPA rising and falling edge both are earlier than PRD and ZERO edge, so if I can ignore the CMPA action, I can realize the 50% duty cycle with PRD and ZERO, and if i add CMPA action, the CMPA action will not be effected by the PRD and ZERO action, so I can use the four configurations combination to realize the switching of to PWM trigger method. but I failed to do that because CMPA cannot be ignored even it is set higher than PRD. Do you have any other suggestions to realize my PWM trigger method switching? The need comes from customer power topology design which need the phase shift and duty cycle change at the same time. Thanks Joe
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