STM32L053C6 datasheet(31/136 Pages) STMICROELECTRONICS

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DS10152 Rev 9

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STM32L053x6 STM32L053x8

Functional overview

3.18

Timers and watchdogs

The ultra-low-power STM32L053x6/8 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.

3.18.1

General-purpose timers (TIM2, TIM21 and TIM22)

There are three synchronizable general-purpose timers embedded in the STM32L053x6/8

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.

TSC_G4_IO1

PA9

TSC_G8_IO1

PC6

TSC_G4_IO2

PA10

TSC_G8_IO2

PC7

TSC_G4_IO3

PA11

TSC_G8_IO3

PC8

TSC_G4_IO4

PA12

TSC_G8_IO4

PC9

1. This GPIO offers a reduced touch sensing sensitivity. It is thus recommended to use it as sampling

capacitor I/O.

Table 8. Capacitive sensing GPIOs available on STM32L053x6/8 devices

Group

Capacitive sensing

signal name

name

Group

Capacitive sensing

signal name

name

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

TIM6

16-bit

Any integer between

1 and 65536

Yes

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