ADC_CTRL
ADC_WRITE4(sc, ADC_CTRL, reg);
ADC_WRITE4(sc, ADC_CTRL, ADC_READ4(sc, ADC_CTRL) & ~ADC_CTRL_ENABLE);
reg = ADC_READ4(sc, ADC_CTRL);
ADC_WRITE4(sc, ADC_CTRL, reg | ADC_CTRL_STEP_WP | ADC_CTRL_STEP_ID);