EPWM_TBCTL
regval = EPWM_READ2(sc, EPWM_TBCTL);
EPWM_WRITE2(sc, EPWM_TBCTL, regval);
reg = EPWM_READ2(sc, EPWM_TBCTL);
EPWM_WRITE2(sc, EPWM_TBCTL, reg);
EPWM_WRITE2(sc, EPWM_TBCTL, reg);