ST STM32L4+ Series Reference Manual page 1477

RM0432
41 Low-power timer (LPTIM) applied to
STM32L4Rxxx and STM32L4Sxxx only
41.1 Introduction
The LPTIM is a 16-bit timer that benefits from the ultimate developments in power
consumption reduction. Thanks to its diversity of clock sources, the LPTIM is able to keep
running in all power modes except for Standby mode. Given its capability to run even with
no internal clock source, the LPTIM can be used as a "Pulse Counter" which can be useful
in some applications. Also, the LPTIM capability to wake up the system from low-power
modes, makes it suitable to realize "Timeout functions" with extremely low power
consumption.
The LPTIM introduces a flexible clock scheme that provides the needed functionalities and
performance, while minimizing the power consumption.
41.2 LPTIM main features
•
16 bit upcounter
• 3-bit prescaler with 8 possible dividing factors (1,2,4,8,16,32,64,128)
•
Selectable clock
–
–
•
16 bit ARR autoreload register
•
16 bit compare register
•
Continuous/One-shot mode
•
Selectable software/hardware input trigger
• Programmable Digital Glitch filter
•
Configurable output: Pulse, PWM
• Configurable I/O polarity
•
Encoder mode
Low-power timer (LPTIM) applied to STM32L4Rxxx and STM32L4Sxxx only
Internal clock sources: LSE, LSI, HSI16 or APB clock
External clock source over LPTIM input (working with no LP oscillator running,
used by Pulse Counter application)
RM0432 Rev 6 1477/2301
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