STM32L072X8 datasheet(32/147 Pages) STMICROELECTRONICS

32 / 147 page

Functional overview

STM32L072xx

32/147

DocID027100 Rev 3

3.16.1

General-purpose timers (TIM2, TIM3, TIM21 and TIM22)

There are four synchronizable general-purpose timers embedded in the STM32L072xx

device (see Table 10 for differences).

TIM2, TIM3

TIM2 and TIM3 are based on 16-bit auto-reload up/down counter. It includes a 16-bit

prescaler. It features four independent channels each for input capture/output compare,

PWM or one-pulse mode output.

The TIM2/TIM3 general-purpose timers can work together or with the TIM21 and TIM22

general-purpose timers via the Timer Link feature for synchronization or event chaining.

Their counter can be frozen in debug mode. Any of the general-purpose timers can be used

to generate PWM outputs.

TIM2/TIM3 have independent DMA request generation.

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.

3.16.2

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

3.16.3

Basic timer (TIM6, TIM7)

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

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