STM32L051C8 datasheet(28/127 Pages) STMICROELECTRONICS

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Functional overview

STM32L051x6 STM32L051x8

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DocID025938 Rev 6

3.14

System configuration controller

The system configuration controller provides the capability to remap some alternate

functions on different I/O ports.

The highly flexible routing interface allows the application firmware to control the routing of

different I/Os to the TIM2, TIM21, TIM22 and LPTIM timer input captures. It also controls the

routing of internal analog signals to ADC, COMP1 and COMP2 and the internal reference

voltage VREFINT.

3.15

Timers and watchdogs

The ultra-low-power STM32L051x6/8 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.

3.15.1

General-purpose timers (TIM2, TIM21 and TIM22)

There are three synchronizable general-purpose timers embedded in the STM32L051x6/8

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.

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

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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