ADHWT
coco0
coco1
coco2
coco3
coco4
coco5
coco6
coco7
SIM_ADCOPT[ADC0PRETRGSEL]
Software
PDB0
PDB0_ADC0_trig
ADC0
pretrig0
pretrig1
pretrig2
pretrig3
pretrig4
pretrig5
pretrig6
pretrig7
CH0
adhwts0
adhwts1
adhwts2
adhwts3
adhwts4
adhwts5
adhwts6
adhwts7
TRGMUX_ADC0_trig
coco0
coco1
coco2
coco3
coco4
coco5
coco6
coco7
ch0_trig
TRGMUX
TRGMUX_ADC0_pretrig
LPIT
LPIT_trig
LPIT_pretrig
SIM_ADCOPT[ADC0TRGSEL]
Example: LPIT hardware trigger via TRGMUX for ADC conversion
• ADC module initialization and enable its hardware trigger;
• Enable the LPIT module clock;
• Reset the LPIT timer channels and registers;
• Setup timer operation in debug and doze modes and enable LPIT module;
• Setup the LPIT_CH0 and LPIT_CH1 counters mode to "32-bit Periodic
Counter",and keep default values for the trigger source;
• Set timer period for LPIT_CH0 and LPIT_CH1,they are used as ADC pre-trigger
delay;
• Starts the timer counting after all configuration;
• In SIM register, select TRGMUX output as ADC pre-trigger and trigger source;
• Configure LPIT_CH0 and LPIT_CH1 as ADC hardware trigger by TRGMUX;
• In the ADC interrupt routine, clear the COCO flag and read the conversion value. (If
Rn is read, the COCO flag will be cleared automatically.)
The following pseudo-code matches the described setup above:
ADC_Config();
CLOCK_EnableClock(LPIT0);
LPIT0_MCR |= LPIT_MCR_SW_RST_MASK;
Chapter 42 Low-power Periodic Interrupt Timer (LPIT)
Kinetis KE1xF Sub-Family Reference Manual, Rev. 4, 06/2019
NXP Semiconductors
1141
Содержание KE1xF Series
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