STM32H747AI datasheet(46/252 Pages) STMICROELECTRONICS

46 / 252 page

Functional overview

STM32H747xI/G

36/242

DS12930 Rev 1

3.29.4

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.

3.29.5

Low-power timers (LPTIM1, LPTIM2, LPTIM3, LPTIM4, LPTIM5)

The low-power timers have an independent clock and is running also in Stop mode if it is

clocked by LSE, LSI or an external clock. It is able to wakeup the devices from Stop mode.

This low-power timer supports 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

3.29.6

Independent watchdogs

There are two independent watchdogs, one per domain. Each 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.

3.29.7

Window watchdogs

There are two window watchdogs, one per domain. Each 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 or each respective domain (configurable in the RCC register), 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.

3.29.8

SysTick timer

The devices feature two SysTick timers, one per CPU. These timers are dedicated to real-

time operating systems, but could also be used as a standard downcounter. It features:

•

A 24-bit downcounter

•

Autoreload capability

•

Maskable system interrupt generation when the counter reaches 0

•

Programmable clock source.

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