How do I set the NUCLEO-L476 to Low power mode

[Schuyler]

I need to use the energy collection mode of ST25 to wake up L4. The software used now is En.X-Cub-NFC7. How can I modify the example code to set L4 to low power mode and wake up L4 only through the energy of ST25?

[Uwe Bonnes]

You can either hope that HAL/Cube provides what you want or read, study and  understand the reference manual w.r.t. to power saving and eventually code yourself.

[Andrew Neil]

See the links from @Piranha here for a discussion of correctly entering & leaving low-power modes:

https://community.st.com/t5/stm32cubeide-mcus/dbgmcu-cr-dbg-stop-setting-ignored/m-p/616354/highlight/true#M22468