PDB triggering scheme is the default and suggested trigger method for ADC. Two ADC
and one PDB work as one pair, the implementation on this device is: PDB0-ADC0 and
ADC1. Here we take PDB0-ADC0 and ADC1 as an example to specify the triggering
scheme.
• Set SIM_ADCOPT[ADCxTRGSEL]=0. PDB0 channel0 and channel1 is selected as
ADC trigger source.
• Set SIM_ADCOPT[ADCxPRETRGSEL]=00. PDB0 pre-triggers will connect
directly to ADC0 and ADC1 ADHWTS ports to control the channels.
• The ADC0 and ADC1 COCO signals are directly feed-backed to PDB0 to deactivate
the PDB lock state.
Following are typical case for ADC triggering using PDB:
Case 1:
ADC0
Trigger_source_A
PDB0
ADHWT
ADHWTSn
ADC_COCOn
ADC1
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.
• Set SIM_ADCOPT[ADCxPRETRGSEL]=01. LPIT pre-triggers will connect directly
to ADC0 and ADC1 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 2 ADCs at same time. This is
one of the benefits for TRGMUX triggering, compared with PDB triggering.
Chapter 36 Analog-to-Digital Converter (ADC)
Kinetis KE1xZ256 Sub-Family Reference Manual, Rev. 3, 07/2018
NXP Semiconductors
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Содержание Kinetis KE1xZ256
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