Figure 274. Capture/Compare Channel (Example: Channel 1 Input Stage); Figure 275. Capture/Compare Channel 1 Main Circuit - ST STM32L4x6 Reference Manual

General-purpose timers (TIM2/TIM3/TIM4/TIM5)

Figure 274. 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.
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Figure 275. Capture/compare channel 1 main circuit

DocID024597 Rev 3
RM0351