STM32H7B3AI datasheet(28/238 Pages) STMICROELECTRONICS

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If configured as standard 16-bit timers, they have the same features as the general-purpose TIMx timers. If

configured as 16-bit PWM generators, they have 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.

The advanced-control timers support independent DMA request generation.

3.34.2

General-purpose timers (TIMx)

There are ten synchronizable general-purpose timers embedded in the STM32H7B3xI devices (see

Table 4. Timer feature comparison for differences).

•

TIM2, TIM3, TIM4 and TIM5

The devices include 4 full-featured general-purpose timers: TIM2, TIM3, TIM4 and TIM5. TIM2 and TIM5

are based on a 32-bit auto-reload up/downcounter and a 16-bit prescaler while TIM3 and TIM4 are based

on a 16-bit auto-reload up/downcounter and a 16-bit prescaler. All timers feature 4 independent channels

for input capture/output compare, PWM or one-pulse mode output. This gives up to 16 input capture/output

compare/PWMs on the largest packages.

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

timers and the advanced-control timers (TIM1, 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 and 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.

•

TIM12, TIM13, TIM14, TIM15, TIM16 and TIM17

These timers are based on a 16-bit auto-reload upcounter and a 16-bit prescaler. TIM13, TIM14, TIM16 and

TIM17 feature one independent channel, whereas TIM12 and TIM15 have two independent channels for

input capture/output compare, PWM or one-pulse mode output. They can be synchronized with the TIM2,

TIM3, TIM4 and TIM5 full-featured general-purpose timers or used as simple time bases.

3.34.3

Basic timers (TIM6 and TIM7)

These timers are mainly used for DAC trigger and waveform generation. They can also be used as a generic

16-bit time base.

TIM6 and TIM7 support independent DMA request generation.

3.34.4

Low-power timers (LPTIM1, LPTIM2, LPTIM3)

The low-power timers feature an independent clock and are running also in Stop mode if they are clocked by LSE,

LSI or an external clock. The low-power timers are able to wakeup the devices from Stop mode.

The low-power timers support the following features:

•

16-bit up counter with 16-bit autoreload register

•

16-bit compare register

•

Configurable output: pulse, PWM

•

Continuous / one-shot mode

•

Selectable software / hardware input trigger

•

Selectable clock source:

•

Internal clock source: LSE, LSI, HSI or APB clock

•

External clock source over LPTIM input (working even with no internal clock source running, used by the

Pulse Counter Application)

•

Programmable digital glitch filter

•

Encoder mode

3.34.5

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.

STM32H7B3xI

Timers and watchdogs

DS13139 - Rev 8

page 28/238

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