STM32L151XE datasheet(28/134 Pages) STMICROELECTRONICS

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Functional overview

STM32L151xE STM32L152xE

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DocID025433 Rev 8

3.16

Timers and watchdogs

The ultra-low-power STM32L151xE and STM32L152xE devices include seven general-

purpose timers, two basic timers, and two watchdog timers.

Table 6 compares the features of the general-purpose and basic timers.

3.16.1

General-purpose timers (TIM2, TIM3, TIM4, TIM5, TIM9, TIM10 and

TIM11)

There are seven synchronizable general-purpose timers embedded in the STM32L151xE

and STM32L152xE devices (see Table 6 for differences).

TIM2, TIM3, TIM4, TIM5

TIM2, TIM3, TIM4 are based on 16-bit auto-reload up/down counter. TIM5 is based on a 32-

bit auto-reload up/down counter. They include a 16-bit prescaler. They feature four

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

output. This gives up to 16 input captures/output compares/PWMs on the largest packages.

TIM2, TIM3, TIM4, TIM5 general-purpose timers can work together or with the TIM10,

TIM11 and TIM9 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, TIM4, TIM5 all 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.

TIM10, TIM11 and TIM9

TIM10 and TIM11 are based on a 16-bit auto-reload upcounter. TIM9 is based on a 16-bit

auto-reload up/down counter. They include a 16-bit prescaler. TIM10 and TIM11 feature one

independent channel, whereas TIM9 has two independent channels for input capture/output

compare, PWM or one-pulse mode output. They can be synchronized with the TIM2, TIM3,

TIM4, TIM5 full-featured general-purpose timers.

Table 6. Timer feature comparison

Timer

Counter

resolution

Counter type

Prescaler factor

DMA

request

generation

Capture/compare

channels

Complementary

outputs

TIM2,

TIM3,

TIM4

16-bit

Up, down,

up/down

Any integer between

1 and 65536

Yes

TIM5

32-bit

Up, down,

up/down

Any integer between

1 and 65536

Yes

TIM9

16-bit

Up, down,

up/down

Any integer between

1 and 65536

TIM10,

TIM11

16-bit

Any integer between

1 and 65536

TIM6,

TIM7

16-bit

Any integer between

1 and 65536

Yes

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