Table 189. Effect Of Low-Power Modes On The Lptim; Table 190. Interrupt Events - STMicroelectronics STM32WLEx Reference Manual

RM0461
26.5 LPTIM low-power modes
Mode
Sleep
Stop
Standby
26.6 LPTIM interrupts
The following events generate an interrupt/wake-up event, if they are enabled through the
LPTIM_IER register:
•
Compare match
• Auto-reload match (whatever the direction if encoder mode)
•
External trigger event
•
Autoreload register write completed
•
Compare register write completed
•
Direction change (encoder mode), programmable (up / down / both).
•
Update Event
•
Repetition register update OK
Note: If any bit in the LPTIM_IER register is set after that its corresponding flag in the LPTIM_ISR
register (Status Register) is set, the interrupt is not asserted.
Interrupt event
Compare match
Auto-reload match
External trigger event
Auto-reload register
update OK
Compare register
update OK
Direction change

Table 189. Effect of low-power modes on the LPTIM

No effect. LPTIM interrupts cause the device to exit Sleep mode.
If the LPTIM is clocked by an oscillator available in Stop mode, LPTIM is functional
and the interrupts cause the device to exit the Stop mode (refer to
implementation).
The LPTIM peripheral is powered down and must be reinitialized after exiting Standby
mode.

Table 190. Interrupt events

Interrupt flag is raised when the content of the Counter register
(LPTIM_CNT) matches the content of the compare register (LPTIM_CMP).
Interrupt flag is raised when the content of the Counter register
(LPTIM_CNT) matches the content of the Auto-reload register
(LPTIM_ARR).
Interrupt flag is raised when an external trigger event is detected
Interrupt flag is raised when the write operation to the LPTIM_ARR register
is complete.
Interrupt flag is raised when the write operation to the LPTIM_CMP register
is complete.
Used in Encoder mode. Two interrupt flags are embedded to signal
direction change:
– UP flag signals up-counting direction change
– DOWN flag signals down-counting direction change.
RM0461 Rev 5
Low-power timer (LPTIM)
Description
Description
Section 26.3: LPTIM
857/1306
870