STM32H7 datasheet(30/357 Pages) STMICROELECTRONICS

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Functional overview

STM32H742xI/G STM32H743xI/G

30/357

DS12110 Rev 10

3.6

Low-power strategy

There are several ways to reduce power consumption on STM32H742xI/G and

STM32H743xI/G:

•

Decrease the dynamic power consumption by slowing down the system clocks even in

Run mode and by 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

(Wait 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

subsystem 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

and 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

Standby

DStandby

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