RM0444 Rev 5 845/1390
RM0444 Low-power timer (LPTIM)
856
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).
Note: If any bit in the LPTIM_IER register (Interrupt Enable Register) is set after that its
corresponding flag in the LPTIM_ISR register (Status Register) is set, the interrupt is not
asserted.
26.7 LPTIM registers
The peripheral registers can only be accessed by words (32-bit).
Table 142. Interrupt events
Interrupt event Description
Compare match
Interrupt flag is raised when the content of the Counter register
(LPTIM_CNT) matches the content of the compare register (LPTIM_CMP).
Auto-reload match
Interrupt flag is raised when the content of the Counter register
(LPTIM_CNT) matches the content of the Auto-reload register
(LPTIM_ARR).
External trigger event Interrupt flag is raised when an external trigger event is detected
Auto-reload register
update OK
Interrupt flag is raised when the write operation to the LPTIM_ARR register
is complete.
Compare register
update OK
Interrupt flag is raised when the write operation to the LPTIM_CMP register
is complete.
Direction change
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.
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