ST STM32L4+ Series Reference Manual page 198

Power control (PWR)
Mode name Entry
WFI or Return
Sleep
from ISR
(Sleep-now or
Sleep-on-exit)
WFE
Low-power
Set LPR bit
run
Set LPR bit +
WFI or Return
Low-power
from ISR
sleep
Set LPR bit +
WFE
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Table 26. Low-power mode summary
Wakeup
(1)
source
system clock
Same as before
Any interrupt
entering Sleep
mode
Wakeup event
Same as Low-
Clear LPR bit
power run clock
Same as before
Any interrupt
entering Low-
power sleep
mode
Wakeup event
RM0432 Rev 6
Wakeup
Effect on clocks
CPU clock OFF
no effect on other clocks
or analog clock sources
None
CPU clock OFF
no effect on other clocks
or analog clock sources
RM0432
Voltage
regulators
MR LPR
ON ON
OFF ON
OFF ON
OFF ON