STM32L081CB datasheet(28/110 Pages) STMICROELECTRONICS

28 / 110 page

Functional overview

STM32L081xx

28/110

DocID027513 Rev 4

These timers are capable of handling quadrature (incremental) encoder signals and the

digital outputs from 1 to 3 hall-effect sensors.

TIM21 and TIM22

TIM21 and TIM22 are based on a 16-bit auto-reload up/down counter. They include a 16-bit

prescaler. They have two independent channels for input capture/output compare, PWM or

one-pulse mode output. They can work together and be synchronized with the TIM2/TIM3,

full-featured general-purpose timers.

They can also be used as simple time bases and be clocked by the LSE clock source

(32.768 kHz) to provide time bases independent from the main CPU clock.

3.15.2

Low-power Timer (LPTIM)

The low-power timer has an independent clock and is running also in Stop mode if it is

clocked by LSE, LSI or an external clock. It is able to wakeup the devices from Stop mode.

This low-power timer 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 LPTIM input (working even with no internal clock

source running, used by the Pulse Counter Application)



Programmable digital glitch filter



Encoder mode

3.15.3

Basic timer (TIM6, TIM7)

These timers can be used as a generic 16-bit timebase.

3.15.4

SysTick timer

This timer is dedicated to the OS, but could 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’.

3.15.5

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. It 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.

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