ST STM32F410 Reference Manual page 462

Low-power timer (LPTIM)
Bits 31:22 Reserved, must be kept at reset value.
Bit 21 Reserved, must be kept at reset value.
Bit 20 Reserved, must be kept at reset value.
Bit 19 Reserved, must be kept at reset value.
Bits 18:16 Reserved, must be kept at reset value.
Bit 15 Reserved, must be kept at reset value.
Bit 14 Reserved, must be kept at reset value.
Bit 13 Reserved, must be kept at reset value.
Bit 12 Reserved, must be kept at reset value.
Bit 11 Reserved, must be kept at reset value.
Bit 10 Reserved, must be kept at reset value.
Bit 9 Reserved, must be kept at reset value.
Bits 8:7 Reserved, must be kept at reset value.
Bit 6 DOWN: Counter direction change up to down
In Encoder mode, DOWN bit is set by hardware to inform application that the counter direction has
changed from up to down. DOWN flag can be cleared by writing 1 to the DOWNCF bit in the
LPTIM_ICR register.
Note: If the LPTIM does not support encoder mode feature, this bit is reserved. Please refer to
Section 18.3: LPTIM
Bit 5 UP: Counter direction change down to up
In Encoder mode, UP bit is set by hardware to inform application that the counter direction has
changed from down to up. UP flag can be cleared by writing 1 to the UPCF bit in the LPTIM_ICR
register.
Note: If the LPTIM does not support encoder mode feature, this bit is reserved. Please refer to
Section 18.3: LPTIM
Bit 4 ARROK: Autoreload register update OK
ARROK is set by hardware to inform application that the APB bus write operation to the LPTIM_ARR
register has been successfully completed. ARROK flag can be cleared by writing 1 to the ARROKCF
bit in the LPTIM_ICR register.
Bit 3 CMPOK: Compare register update OK
CMPOK is set by hardware to inform application that the APB bus write operation to the
LPTIM_CMP register has been successfully completed.
Bit 2 EXTTRIG: External trigger edge event
EXTTRIG is set by hardware to inform application that a valid edge on the selected external trigger
input has occurred. If the trigger is ignored because the timer has already started, then this flag is
not set. EXTTRIG flag can be cleared by writing 1 to the EXTTRIGCF bit in the LPTIM_ICR register.
Bit 1 ARRM: Autoreload match
ARRM is set by hardware to inform application that LPTIM_CNT register's value reached the
LPTIM_ARR register's value. ARRM flag can be cleared by writing 1 to the ARRMCF bit in the
LPTIM_ICR register.
Bit 0 CMPM: Compare match
The CMPM bit is set by hardware to inform application that LPTIM_CNT register value reached the
LPTIM_CMP register's value.
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implementation.
RM0401 Rev 3
RM0401