PWM_CTL_USEF2
sc->sc_channels[1].ctlmask = PWM_CTL_MSEN2 | PWM_CTL_USEF2 |
if ((w & (PWM_CTL_USEF1|PWM_CTL_USEF2)) == 0 &&
(ctl & (PWM_CTL_USEF1|PWM_CTL_USEF2)) != 0)