STM32F051R6 datasheet(21/104 Pages) STMICROELECTRONICS

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STM32F051x

Functional overview

Doc ID 022265 Rev 3

21/105

3.14.2

General-purpose timers (TIM2..3, TIM14..17)

There are six synchronizable general-purpose timers embedded in the STM32F051x

devices (see Table 7 for differences). Each general-purpose timer can be used to generate

PWM outputs, or as simple time base.

TIM2, TIM3

STM32F051x devices feature two synchronizable 4-channel general-purpose timers. TIM2

is based on a 32-bit auto-reload up/downcounter and a 16-bit prescaler. TIM3 is based on a

16-bit auto-reload up/downcounter and a 16-bit prescaler. They feature 4 independent

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

gives up to 12 input captures/output compares/PWMs on the largest packages.

The TIM2 and TIM3 general-purpose timers can work together or with the TIM1 advanced-

control timer via the Timer Link feature for synchronization or event chaining.

TIM2 and TIM3 both 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.

Their counters can be frozen in debug mode.

TIM14

This timer is based on a 16-bit auto-reload upcounter and a 16-bit prescaler.

TIM14 features one single channel for input capture/output compare, PWM or one-pulse

mode output.

Its counter can be frozen in debug mode.

TIM15, TIM16 and TIM17

These timers are based on a 16-bit auto-reload upcounter and a 16-bit prescaler.

TIM15 has two independent channels, whereas TIM16 and TIM17 feature one single

channel for input capture/output compare, PWM or one-pulse mode output.

The TIM15, TIM16 and TIM17 timers can work together, and TIM15 can also operate with

TIM1 via the Timer Link feature for synchronization or event chaining.

TIM15 can be synchronized with TIM16 and TIM17.

TIM15, TIM16, and TIM17 have a complementary output with dead-time generation and

independent DMA request generation

Their counters can be frozen in debug mode.

3.14.3

Basic timer TIM6

This timer is mainly used for DAC trigger generation. It can also be used as a generic 16-bit

time base.

3.14.4

Independent watchdog (IWDG)

The independent watchdog is based on an 8-bit prescaler and 12-bit downcounter with user-

defined refresh window. It is clocked from an independent 40 kHz internal RC and as it

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