36.6.7 ADC Trigger Concept – Use Case
FTM module support counter init trigger and channel match trigger, these triggers could
be used as trigger input of PDB, PDB then be used to trigger other modules like ADC.
Each ADC channel in PDB module supports up to 2 pre-triggers, which could be used as
ADC hardware channel selection to precondition the ADC block prior to actual trigger.
The ADC trigger is initiated after pre-trigger to trigger ADC conversion. The waveforms
shown in following diagram illustrate the pre-trigger and trigger output of PDB to ADC.
Every time when one PDB pre-trigger and trigger output starts an ADC conversion, an
internal lock associated with the corresponding pre-trigger is activated. This lock
becomes inactive when receiving COCO signal from ADC.
TRGMUX
FTM
match_trig
init_trig
gtb_out
gtb_in
hw_trig
DMA
CPU
PDB
ch0_trig
ch0_pretrig0
ch0_pretrig1
ADC
COCO
pretrig0
pretrig1
CH0
S/H & C
on
ver
sion
...
ADC_CHx
INTERRUPT
DMA_REQ
ch1_trig
ch1_pretrig0
ch1_pretrig1
pretrig0
pretrig1
CH1
result0
result1
result0
result1
ADC0
ADC1
Figure 36-3. PWM Load Diagnosis – ADC Trigger Concept (block diagram)
Chapter 36 Analog-to-Digital Converter (ADC)
Kinetis KE1xZ256 Sub-Family Reference Manual, Rev. 3, 07/2018
NXP Semiconductors
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