STM32L031C6 datasheet(29/126 Pages) STMICROELECTRONICS

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DS10668 Rev 6

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STM32L031x4/6

Functional overview

3.15

Timers and watchdogs

The ultra-low-power STM32L031x4/6 devices include three general-purpose timers, one

low- power timer (LPTM), two watchdog timers and the SysTick timer.

Table 9 compares the features of the general-purpose and basic timers.

3.15.1

General-purpose timers (TIM2, TIM21 and TIM22)

There are three synchronizable general-purpose timers embedded in the STM32L031x4/6

devices (see Table 9 for differences).

TIM2

TIM2 is 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 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 has independent DMA request generation.

This timer is 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, 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.

Table 9. Timer feature comparison

Timer

Counter

resolution

Counter type

Prescaler factor

DMA

request

generation

Capture/compare

channels

Complementary

outputs

TIM2

16-bit

Up, down,

up/down

Any integer between

1 and 65536

Yes

TIM21,

TIM22

16-bit

Up, down,

up/down

Any integer between

1 and 65536

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