"OPMODE" in STM32L4 LPTIM description
All the STM32L4 reference manuals. describe LPTIM_CFGR
Bit 20 WAVE: Waveform shape
The WAVE bit controls the output shape
0: Deactivate Set-once mode, PWM / One Pulse waveform (depending on OPMODE bit)
OPMODE bit is mentioned nowhere else .
STM32G4 datasheet has
Bit 20 WAVE: Waveform shape
The WAVE bit controls the output shape
0: Deactivate Set-once mode, PWM or One Pulse waveform depending on how the timer was
started, CNTSTRT for PWM or SNGSTRT for One Pulse waveform.
This description does make more sense. Please correct in L4 reference manuals.
