Datasheet

Functional overview STM32F051x4 STM32F051x6 STM32F051x8
22/121 DocID022265 Rev 6
3.14.2 General-purpose timers (TIM2, 3, 14, 15, 16, 17)
There are six synchronizable general-purpose timers embedded in the STM32F051xx
devices (see Table 7 for differences). Each general-purpose timer can be used to generate
PWM outputs, or as simple time base.
TIM2, TIM3
STM32F051xx 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 independe
nt DMA request generation.
These timers are capable of handling quadratur
e (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 ca
pture/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, wherea
s 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 to
gether, and TIM15 can also operate
withTIM1 via the Timer Link feature for synchronization or event chaining.
TIM15 can be synchronized with TIM16 and TIM17.
TIM15, TIM16 and TIM17 have a complementa
ry 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
operates independently from the main clock, it can operate in Stop and Standby modes. It
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