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NOTE
VREFH pin on the PCB should use 3 bypass capacitors in
the range: 1 μF, 100 nF and 1 nF. Capacitors should be
placed to the VREFH pin as close as possible.
• Bandgap from PMC connected as the V
ALT2
reference option. The V
ALT2
input is
also connected within the ADC module as ADC channel 27
ADCx_SC2[REFSEL] bit selects the voltage reference sources for ADC. Refer to
REFSEL description in ADC chapter for more details.
36.1.4.3 ADC Trigger Sources
The ADC support multiple trigger sources. There is two kinds of trigger: pre-trigger and
trigger. The pre-trigger precondition the ADC block and selects the specific data result
register, before the ADC trigger is asserted. The trigger initiate the ADC conversion as
soon as it's asserted. The trigger and pre-trigger sources are described as following:
• Hardware pre-triggers/triggers are connected through PDB and TRGMUX. The pre-
triggers can also be controlled by software to provide flexible trigger schemes (by
controlling SIM_ADCOPT[ADCxSWPRETRG] registers). Besides the hardware
triggers through ADHWT, the ADC module itself also supports software trigger
mode by setting SC2[ADTRG]=0. Following a write to SC1A register, a conversion
is initiated.
• 1×PDB can generate triggers and pre-triggers for 2×ADC, each PDB channel will
have up to 2 pre-triggers for ADC channel control, which provides an automatically
trigger scheme so that the CPU involvement is not necessary.
• TRGMUX can provide triggers for each ADC, while the pre-triggers need to be
controlled by software to determine relative priority. It should not trigger the ADC
again before a single conversion has not completed.
The following triggers are via the TRGMUX:
• CMP out to trigger each ADC
• LPIT capable to trigger each ADC, LPIT supports up to 4 pre-triggers, two are for
ADC0 ADHWTSA~ADHWTSB and the another two are for ADC1
ADHWTSA~ADHWTSB.
• RTC capable to trigger each ADC
• LPTMR capable to trigger each ADC
• Software trigger capable to trigger each ADC
Chapter 36 Analog-to-Digital Converter (ADC)
Kinetis KE1xZ256 Sub-Family Reference Manual, Rev. 3, 07/2018
NXP Semiconductors
733
Содержание Kinetis KE1xZ256
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