Datasheet

DS12110 Rev 5 23/231

STM32H743xI Functional overview

3.6 Low-power strategy

There are several ways to reduce power consumption on STM32H743xI:

 Decrease

dynamic power consumption by slowing down the system clocks even in

Run mode and individually clock gating the peripherals that are not used.

 Save power consumption when the CPU is idle, by selecting among the available low-

power mode according to the user application needs. This allows achieving the best

compromise between short startup time, low-power consumption, as well as available

wakeup sources.

The devices feature several low-power modes:

 CSleep

(CPU clock stopped)

 CStop (CPU sub-system clock stopped)

 DStop (Domain bus matrix clock stopped)

 Stop (System clock stopped)

 DStandby (Domain powered down)

 Standby (System powered down)

CSleep and CStop low-power modes are entered by the MCU when executing the WFI

ait for Interrupt) or WFE (Wait for Event) instructions, or when the SLEEPONEXIT bit of

the Cortex

-Mx core is set after returning from an interrupt service routine.

A domain can enter low-power mode (DStop or DStandby) when the processor, its

sub

system and the peripherals allocated in the domain enter low-power mode.

If part of the domain is not in low-power mode, the domain remains in the current mode.

Finally the system can enter Stop or Standby when all EXTI wakeup sources are cleared

d the power domains are in DStop or DStandby mode.

Table 3. System vs domain low-power mode

System power mode

D1 domain power

mode

D2 domain power

mode

D3 domain power

mode

Run DRun/DStop/DStandby DRun/DStop/DStandby DRun

Stop DStop/DStandby DStop/DStandby DStop

Standby DStandby DStandby DStandby