STM32L082KB datasheet(31/132 Pages) STMICROELECTRONICS

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DS10688 Rev 7

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STM32L082xx

Functional overview

3.17

Timers and watchdogs

The ultra-low-power STM32L082xx devices include three general-purpose timers, one low-

power timer (LPTIM), one basic timer, two watchdog timers and the SysTick timer.

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

3.17.1

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

There are four synchronizable general-purpose timers embedded in the STM32L082xx

device (see Table 9 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.

Table 9. Timer feature comparison

Timer

Counter

resolution

Counter type

Prescaler factor

DMA

request

generation

Capture/compare

channels

Complementary

outputs

TIM2,

TIM3

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

TIM6,

TIM7

16-bit

Any integer between

1 and 65536

Yes

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