NXP Semiconductors K32 L2A Series, Reference Manual, Page: 218 / 1379

11.4.10.1 Normal 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 the ADC registers, including Rn, are unaffected by Normal Stop mode. After
exiting from Normal Stop mode, a software or hardware trigger is required to resume
conversions.
11.4.10.2 Normal Stop mode with ADACK enabled
If ADACK is selected as the conversion clock, the ADC continues operation during
Normal Stop mode. See the chip-specific ADC information for configuration information
for this device.
If a conversion is in progress when the MCU enters Normal Stop mode, it continues until
completion. Conversions can be initiated while the MCU is in Normal Stop mode by
means of the hardware trigger or if continuous conversions are enabled.
If the compare and hardware averaging functions are disabled, a conversion complete
event sets SC1n[COCO] and generates an ADC interrupt to wake the MCU from Normal
Stop mode if the respective ADC interrupt is enabled, that is, when SC1n[AIEN]=1. The
result register, Rn, will contain the data from the first completed conversion that occurred
during Normal Stop mode. If the hardware averaging function is enabled, SC1n[COCO]
will set, and generate an interrupt if enabled, when the selected number of conversions
are completed. If the compare function is enabled, SC1n[COCO] will set, and generate an
interrupt if enabled, only if the compare conditions are met. If a single conversion is
selected and the compare is not true, the ADC will return to its idle state and cannot wake
the MCU from Normal Stop mode unless a new conversion is initiated by another
hardware trigger.
11.5 Initialization information
This section gives an example that provides some basic direction on how to initialize and
configure the ADC module.
The user can configure the module for 16-bit, 12-bit, 10-bit, or 8-bit single-ended
resolution or 16-bit, 13-bit, 11-bit, or 9-bit differential resolution, single or continuous
conversion, and a polled or interrupt approach, among many other options. For
information used in this example, refer to
Table 11-6 , Table 11-7 , and Table 11-8 .
Initialization information
K32 L2A Reference Manual, Rev. 2, 01/2020
218 NXP Semiconductors