37.1.4.2 External window/sample input
PDB and LPIT could be used to generate pulse output which can be used as sampling
windows of CMP block via TRGMUX.
SAMPLE
SAMPLE
PDB0
CMP0
Pulse1
Trigger
Trigger
LPIT_trig
PDB_trig
Pulse0
TRGMUX
LPIT
CMP1
LPTMR0
CH0
CH1
CH2
CH3
Pre-trigger
37.1.4.3 CMP trigger mode
The CMP and 8-bit DAC sub-block supports trigger mode operation when the chip is in
STOP or VLPS mode. When trigger mode is enabled, the trigger source will provide a
low power clock and the triggers to the CMP. The trigger event will initiate a compare
sequence that must first enable the CMP and DAC prior to performing a CMP operation
and capturing the output.
In this device, control for this two-staged sequencing is provided from, for example,
LPTMR. The LPTMR provides a single trigger output to all implemented comparators.
Through configuration of the CMPx_C2[RRE] bits the trigger can be used to trigger a
single comparator or multiple comparators concurrently. The LPTMR only offers single
wire trigger to CMP. And the configuration must be done by LPTMR itself (round robin)
before entering low power mode.
Chapter 37 Comparator (CMP)
Kinetis KE1xZ256 Sub-Family Reference Manual, Rev. 3, 07/2018
NXP Semiconductors
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