Datasheet

DS12323 Rev 2 25/91
STM32L010F4/K4 Functional overview
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3.13.2 Low-power timer (LPTIM)
LPTIM1 has an independent clock and is running also in Stop mode if it is clocked by LSE,
LSI or an external clock. This timer is able to wakeup the STM32L010F4/K4 from Stop
mode.
LPTIM1 supports the following features:
• 16-bit up counter with 16-bit autoreload register
• 16-bit compare register
• Configurable output: pulse, PWM
• Continuous / one shot mode
• Selectable software / hardware input trigger
• Selectable clock source
– Internal clock source: LSE, LSI, HSI or APB clock
– External clock source over LPTIM1 input (working even with no internal clock
source running, used by the pulse counter application)
• Programmable digital glitch filter
• Encoder mode
3.13.3 SysTick timer
This timer is dedicated to the OS, but can also be used as a standard downcounter. It is
based on a 24-bit downcounter with autoreload capability and a programmable clock
source. It features a maskable system interrupt generation when the counter reaches ‘0’.
3.13.4 Independent watchdog (IWDG)
The independent watchdog is based on a 12-bit downcounter and 8-bit prescaler. It is
clocked from an independent 37 kHz internal RC and, as it operates independently of the
main clock, it can operate in Stop and Standby modes. IWDG can be used either as a
watchdog to reset the device when a problem occurs, or as a free-running timer for
application timeout management. It is hardware- or software-configurable through the option
bytes. The counter can be frozen in debug mode.
3.13.5 Window watchdog (WWDG)
The window watchdog is based on a 7-bit downcounter that can be set as free-running. It
can be used as a watchdog to reset the device when a problem occurs. It is clocked from
the main clock. It has an early warning interrupt capability and the counter can be frozen in
debug mode.
3.14 Communication interfaces
3.14.1 I
2
C bus
One I
2
C interface (I2C1) can operate in multimaster or slave mode. The I
2
C interface can
support Standard mode up to 100 kbit/s and Fast mode (Fm) up to 400 kbit/s.
The I
2
C interface supports 7-bit and 10-bit addressing modes, multiple 7-bit slave
addresses (2 addresses, 1 with configurable mask).
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