PWM_CR
cr = PWM_READ(sc, PWM_CR);
PWM_WRITE(sc, PWM_CR, cr);
reg = PWM_READ(sc, PWM_CR);
PWM_WRITE(sc, PWM_CR, reg);
ocr = cr = PWM_READ(sc, PWM_CR);
PWM_WRITE(sc, PWM_CR, cr);
cr = PWM_READ(sc, PWM_CR);