STM32L010RB datasheet(24/89 Pages) STMICROELECTRONICS

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Functional overview

STM32L010RB

24/89

DS12319 Rev 3

3.13

Timers and watchdogs

The ultra-low-power STM32L010RB includes three general-purpose timers, one low- power

timer (LPTIM1), two watchdog timers and the SysTick timer.

3.13.1

General-purpose timers (TIM2, TIM21, TIM22)

Table 5 compares the features of the general-purpose timers.

TIM2

This timer is based on 16-bit auto-reload up/down counter. It includes a 16-bit prescaler and

four independent channels for input capture/output compare, PWM or one-pulse mode

output.

TIM2 can work together and be synchronized with the TIM21 or TIM22 timer via the Timer

Link feature for synchronization or event chaining. The TIM2 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, TIM22

There timers are based on a 16-bit auto-reload up/down counter. They include a 16-bit

prescaler and two independent channels for input capture/output compare, PWM or one-

pulse mode output. Both can work together and be synchronized with TIM2.

Both can also be used as a simple timebase and be clocked by the LSE (32.768 kHz) to

provide independent timebase from the main CPU clock.

Table 5. Features of general purpose timers

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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