Figure 240. Capture/Compare Channel (Example: Channel 1 Input Stage) - ST STM32L4 5 Series Reference Manual

RM0351
30.3.6 Capture/compare channels
Each Capture/Compare channel is built around a capture/compare register (including a
shadow register), an input stage for capture (with digital filter, multiplexing, and prescaler,
except for channels 5 and 6) and an output stage (with comparator and output control).
Figure 240
The input stage samples the corresponding TIx input to generate a filtered signal TIxF.
Then, an edge detector with polarity selection generates a signal (TIxFPx) which can be
used as trigger input by the slave mode controller or as the capture command. It is
prescaled before the capture register (ICxPS).

Figure 240. Capture/compare channel (example: channel 1 input stage)

The output stage generates an intermediate waveform which is then used for reference:
OCxRef (active high). The polarity acts at the end of the chain.
to Figure 243 give an overview of one Capture/Compare channel.
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