Datasheet
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STM32L431xx Functional overview
48
3.22 Timers and watchdogs
The STM32L431xx includes one advanced control timers, up to five general-purpose timers,
two basic timers, two low-power timers, two watchdog timers and a SysTick timer. The table
below compares the features of the advanced control, general purpose and basic timers.
3.22.1 Advanced-control timer (TIM1)
The advanced-control timer can each be seen as a three-phase PWM multiplexed on 6
channels. They have complementary PWM outputs with programmable inserted dead-
times. They can also be seen as complete general-purpose timers. The 4 independent
channels can be used for:
• Input capture
• Output compare
• PWM generation (edge or center-aligned modes) with full modulation capability (0-
100%)
• One-pulse mode output
In debug mode, the advanced-control timer counter can be frozen and the PWM outputs
disabled to turn off any power switches driven by these outputs.
Many features are shared with those of the general-purpose TIMx timers (described in
Section 3.22.2) using the same architecture, so the advanced-control timer can work
together with the TIMx timers via the Timer Link feature for synchronization or event
chaining.
Table 9. Timer feature comparison
Timer type Timer
Counter
resolution
Counter
type
Prescaler
factor
DMA
request
generation
Capture/
compare
channels
Complementary
outputs
Advanced
control
TIM1 16-bit
Up, down,
Up/down
Any integer
between 1
and 65536
Yes 4 3
General-
purpose
TIM2 32-bit
Up, down,
Up/down
Any integer
between 1
and 65536
Yes 4 No
General-
purpose
TIM15 16-bit Up
Any integer
between 1
and 65536
Yes 2 1
General-
purpose
TIM16 16-bit Up
Any integer
between 1
and 65536
Yes 1 1
Basic TIM6, TIM7 16-bit Up
Any integer
between 1
and 65536
Yes 0 No
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