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NOTE
While using TRGMUX, only LPIT supports pretriggers. For
other peripherals, software pretriggers need to be configured
using SIM_ADCOPT[ADCxSWPRETRG].
37.7.1 PDB triggering scheme
The PDB triggering scheme is the default and the suggested trigger method for the ADC.
One ADC and one PDB work as one pair: PDB0-ADC0, PDB1-ADC1. The trigger
sources for PDB0 and PDB1 can be configured through TRGMUX_PDB0 and
TRGMUX_PDB1, respectively. Here we take PDB0-ADC0 as an example to specify the
triggering scheme.
• Set SIM_ADCOPT[ADCxTRGSEL]=0. PDB0 channel 0 is selected as the ADC
trigger source.
• PDB0 pre-triggers will connect directly to the ADC0 ADHWTS port to control the
channels.
• The ADC0 COCO signals are fed directly back to PDB0 to deactivate the PDB lock
state.
The following figures illustrate typical cases for ADC triggering using the PDB:
Case 1:
ADC0
Trigger_source_A
Configured using TRGMUX_PDB0
Configured using TRGMUX_PDB1
PDB0
ADHWT
ADHWTS A:P
ADC_SC1A:P[COCO]
ADC1
Trigger_source_B
PDB1
trigger_in0
trigger_in0
ADHWT
ADHWTS A:P
ADC_SC1A:P[COCO]
Figure 37-3. ADCs triggering with independent sources
Case 2:
Chapter 37 ADC Configuration
MWCT101xS Series Reference Manual, Rev. 3, 07/2019
NXP Semiconductors
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