Table 36-7. Compare modes (continued)
SC2[ACFGT]
SC2[ACREN]
CV1 relative
to CV2
Function
Compare mode description
1
1
Greater than
Outside range, inclusive
Compare true if the result is greater than or
equal to CV1
Or the result is less than or
equal to CV2.
With SC2[ACREN] =1, and if the value of CV1 is less than or equal to the value of CV2,
then setting SC2[ACFGT] will select a trigger-if-inside-compare-range inclusive-of-
endpoints function. Clearing SC2[ACFGT] will select a trigger-if-outside-compare-
range, not-inclusive-of-endpoints function.
If CV1 is greater than CV2, setting SC2[ACFGT] will select a trigger-if-outside-
compare-range, inclusive-of-endpoints function. Clearing SC2[ACFGT] will select a
trigger-if-inside-compare-range, not-inclusive-of-endpoints function.
If the condition selected evaluates true, SC1n[COCO] is set.
Upon completion of a conversion while the compare function is enabled, if the compare
condition is not true, SC1n[COCO] is not set and the conversion result data will not be
transferred to the result register, Rn. If the hardware averaging function is enabled, the
compare function compares the averaged result to the compare values. The same compare
function definitions apply. An ADC interrupt is generated when SC1n[COCO] is set and
the respective ADC interrupt is enabled, that is, SC1n[AIEN]=1.
Note
The compare function can monitor the voltage on a channel
while the MCU is in Wait or Normal Stop mode. The ADC
interrupt wakes the MCU when the compare condition is met.
36.5.6 Calibration function
The ADC is equipped with a calibration mechanism to provide high accuracy as specified
in the data sheet. It is mandatory to calibrate the ADC after power up or reset. Not
doing this can result in ADC conversion results with lower than specified accuracy.
In order to calibrate the ADC correctly, the following has to be done:
• On startup, wait until the reference voltage (VREFH) has stabilized.
• ADC has to be recalibrated after each system reset.
• Calibrate only one ADC instance at a time. So, when calibrating instance ADC0, the
instances ADC1, ADC2, etc. are required to be idle.
• Set ADCK (ADC clock) to half the maximum specified frequency.
Functional description
Kinetis KE1xZ256 Sub-Family Reference Manual, Rev. 3, 07/2018
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NXP Semiconductors
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