
Case 1:
ADC0
Trigger_source_A
PDB0
ADHWT
ADHWTSn
ADC_COCOn
ADC1
Trigger_source_B
PDB1
ADHWT
ADHWTSn
ADC_COCOn
ADC2
Trigger_source_C
PDB2
ADHWT
ADHWTSn
ADC_COCOn
Case 2:
ADC0
Trigger_source_A
PDB0
ADHWT
ADHWTSn
ADC_COCOn
ADC1
PDB1
ADHWT
ADHWTSn
ADC_COCOn
ADC2
PDB2
ADHWT
ADHWTSn
ADC_COCOn
TRGMUX triggering scheme:
TRGMUX supports many trigger sources, here we take LPIT as an example (typical), but
the trigger source can also be others which mentioned above. LPIT supports up to 4
channels, each channel have a trigger and pre-trigger.
• Set SIM_ADCOPT[ADCxTRGSEL]=1. TRGMUX out is selected as ADC trigger
source.
• Configure TRGMUX to select LPIT triggers as ADC trigger and pre-trigger source.
• TRGMUX only supports up to 4 pre-triggers for each ADC (pre-trigger0 ~ pre-
trigger3), the other pre-triggers could not be used with TRGMUX.
• Set SIM_ADCOPT[ADCxPRETRGSEL]=01. LPIT pre-triggers will connect directly
to ADC0 ADHWTS ports to control the channels.
• ADC COCO is not required in this case. Software need to take care of the
intermission time between each ADC conversion.
• With TRGMUX, a single LPIT could be used to trigger 3 ADCs at same time. This is
one of the benefits for TRGMUX triggering, compared with PDB triggering.
Chapter 37 Analog-to-Digital Converter (ADC)
Kinetis KE1xF Sub-Family Reference Manual, Rev. 4, 06/2019
NXP Semiconductors
819
Summary of Contents for KE1xF Series
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