RM0444 Rev 5 831/1390
RM0444 Low-power timer (LPTIM)
856
26 Low-power timer (LPTIM)
26.1 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.
26.2 LPTIM main features
• 16 bit upcounter
• 3-bit prescaler with 8 possible dividing factors (1,2,4,8,16,32,64,128)
• Selectable clock
– Internal clock sources: PCLK or any of the embedded oscillators (see RCC
section)
– External clock source over LPTIM input (working with no embedded oscillator
running, used by Pulse Counter application)
• 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
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