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STM32F105xx, STM32F107xx Description
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2.3.15 Timers and watchdogs
The STM32F105xx and STM32F107xx devices include an advanced-control timer, four
general-purpose timers, two basic timers, two watchdog timers and a SysTick timer.
Table 4 compares the features of the general-purpose and basic timers.
Advanced-control timer (TIM1)
The advanced control timer (TIM1) can be seen as a three-phase PWM multiplexed on 6
channels. It has complementary PWM outputs with programmable inserted dead-times. It
can also be seen as a complete general-purpose timer. The 4 independent channels can be
used for:
• Input capture
• Output compare
• PWM generation (edge or center-aligned modes)
• One-pulse mode output
If configured as a standard 16-bit timer, it has the same features as the TIMx timer. If
configured as the 16-bit PWM generator, it has full modulation capability (0-100%).
The counter can be frozen in debug mode.
Many features are shared with those of the standard TIM timers which have the same
architecture. The advanced control timer can therefore work together with the TIM timers via
the Timer Link feature for synchronization or event chaining.
General-purpose timers (TIMx)
There are up to 4 synchronizable standard timers (TIM2, TIM3, TIM4 and TIM5) embedded
in the STM32F105xx and STM32F107xx connectivity line devices. These timers are based
on a 16-bit auto-reload up/down counter, a 16-bit prescaler and feature 4 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. They can
work together with the Advanced Control timer via the Timer Link feature for synchronization
or event chaining.
The counter can be frozen in debug mode.
Table 4. Timer feature comparison
Timer
Counter
resolution
Counter
type
Prescaler
factor
DMA request
generation
Capture/compare
channels
Complementary
outputs
TIM1 16-bit
Up,
down,
up/down
Any integer
between 1
and 65536
Yes 4 Yes
TIMx
(TIM2,
TIM3,
TIM4,
TIM5)
16-bit
Up,
down,
up/down
Any integer
between 1
and 65536
Yes 4 No
TIM6,
TIM7
16-bit Up
Any integer
between 1
and 65536
Yes 0 No