NXP Semiconductors KE1xF Series, Reference Manual, Page: 858 / 1483

OFS is automatically set according to calibration requirements after the self-calibration
sequence is done, that is, SC3[CAL] is cleared. You can write to OFS to override the
calibration result if desired. If you write an OFS value that is different from the
calibration value, the ADC error specifications may not be met. You should store the
value generated by the calibration function in memory before overwriting with a user-
specified value.
Note
There is an effective limit to the values of offset that you can
set. If the magnitude of the offset is too high, the results of the
conversions will cap off at the limits.
You can use the offset calibration function to remove application offsets or DC bias
values. USR_OFS may be written with a number in two's-complement format and this
offset will be subtracted from the result or hardware averaged value. To add an offset,
store the negative offset in two's-complement format and the effect will be an addition.
An offset correction that results in an out-of-range value will be forced to the minimum
or maximum value. The minimum value for single-ended conversions is 0x0000.
37.5.8 MCU wait mode operation
Wait mode is a lower-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 Alternate Clock sources are available as conversion clock sources while in Wait
mode. The use of ALTCLK as the conversion clock source in Wait is dependent on the
definition of ALTCLK for this MCU. See the Chip Configuration information on
ALTCLK specific to this MCU.
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 Wait
mode if the respective ADC interrupt is enabled, that is, when SC1n[AIEN]=1. 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 trigger
is not met, the ADC will return to its idle state and cannot wake the MCU from Wait
mode unless a new conversion is initiated by the hardware trigger.
Functional description
Kinetis KE1xF Sub-Family Reference Manual, Rev. 4, 06/2019
858 NXP Semiconductors