I use the Power Control PWM module (PCPWM) in PIC18F4431 to generate the 6 PWM signals (SPWM) and work OK, but no change duty cicle which TMR0, and Timer0 its ok, too how configure to make the three PWM signals 120 degrees phase shifted from one another and the other three PWM signals complement of these... this is in picc. please helpme