17.5.6 MCU wait mode operationWait mode is a low-power consumption standby mode from which recovery is fastbecause the clock sources remain active. If a conversion is in progress when the MCUenters wait mode, it continues until completion. Conversions can be initiated while theMCU is in wait mode by means of the hardware trigger or if continuous conversions areenabled.The bus clock, bus clock divided by two, ALTCLK and ADACK are available asconversion clock sources while in wait mode.ADC_SC1[COCO] is set by a conversion complete event that generates an ADC interruptto wake the MCU from wait mode if the ADC interrupt is enabled (ADC_SC1[AIEN] =1).17.5.7 MCU Stop mode operationStop mode is a low-power consumption standby mode during which most or all clocksources on the MCU are disabled.17.5.7.1 Stop mode with ADACK disabledIf the asynchronous clock, ADACK, is not selected as the conversion clock, executing aSTOP instruction aborts the current conversion and places the ADC in its idle state. Thecontents of ADC_R are unaffected by Stop mode. After exiting from Stop mode, asoftware or hardware trigger is required to resume conversions.17.5.7.2 Stop mode with ADACK enabledIf ADACK is selected as the conversion clock, the ADC continues operation during Stopmode. For guaranteed ADC operation, the MCU's voltage regulator must remain activeduring Stop mode. See the module introduction for configuration information for thisMCU.If a conversion is in progress when the MCU enters Stop mode, it continues untilcompletion. Conversions can be initiated while the MCU is in Stop mode by means of thehardware trigger or if continuous conversions are enabled.Chapter 17 Analog-to-digital converter (ADC)MC9S08SU16 Reference Manual, Rev. 5, 4/2017NXP Semiconductors 279
