STM32F401CD datasheet(28/135 Pages) STMICROELECTRONICS

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Functional overview

STM32F401xD STM32F401xE

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DocID025644 Rev 3

If configured as standard 16-bit timers, it has the same features as the general-purpose

TIMx timers. If configured as a 16-bit PWM generator, it has full modulation capability (0-

100%).

The advanced-control timer can work together with the TIMx timers via the Timer Link

feature for synchronization or event chaining.

TIM1 supports independent DMA request generation.

3.19.2

General-purpose timers (TIMx)

There are seven synchronizable general-purpose timers embedded in the

STM32F401xD/xE (see Table 4 for differences).

•

TIM2, TIM3, TIM4, TIM5

The STM32F401xD/xE devices are 4 full-featured general-purpose timers: TIM2, TIM5,

TIM3, and TIM4.The TIM2 and TIM5 timers are based on a 32-bit auto-reload

up/downcounter and a 16-bit prescaler. The TIM3 and TIM4 timers are based on a 16-

bit auto-reload up/downcounter and a 16-bit prescaler. They all feature four

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

output. This gives up to 15 input capture/output compare/PWMs.

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

other general-purpose timers and the advanced-control timers TIM1 and TIM8 via the

Timer Link feature for synchronization or event chaining.

Any of these general-purpose timers can be used to generate PWM outputs.

TIM2, TIM3, TIM4, TIM5 all have independent DMA request generation. They are

capable of handling quadrature (incremental) encoder signals and the digital outputs

from 1 to 4 hall-effect sensors.

•

TIM9, TIM10 and TIM11

These timers are based on a 16-bit auto-reload upcounter and 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. They can also be used as simple time bases.

3.19.3

Independent watchdog

The independent watchdog is based on a 12-bit downcounter and 8-bit prescaler. It is

clocked from an independent 32 kHz internal RC and as it operates independently from the

main clock, it can operate in Stop and Standby modes. It can be used either as a watchdog

to reset the device when a problem occurs, or as a free-running timer for application timeout

management. It is hardware- or software-configurable through the option bytes.

3.19.4

Window watchdog

The window watchdog is based on a 7-bit downcounter that can be set as free-running. It

can be used as a watchdog to reset the device when a problem occurs. It is clocked from

the main clock. It has an early warning interrupt capability and the counter can be frozen in

debug mode.

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