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