ST STM32F2 User Manual

UM1940
HAL PWR Generic Driver
DocID028236 Rev 2
405/1371
Low Power modes configuration
The devices feature 3 low-power modes:
Sleep mode: Cortex-M3 core stopped, peripherals kept running.
Stop mode: all clocks are stopped, regulator running, regulator in low power mode
Standby mode: 1.2V domain powered off.
Sleep mode
Entry: The Sleep mode is entered by using the
HAL_PWR_EnterSLEEPMode(PWR_MAINREGULATOR_ON,
PWR_SLEEPENTRY_WFI) functions with
PWR_SLEEPENTRY_WFI: enter SLEEP mode with WFI instruction
PWR_SLEEPENTRY_WFE: enter SLEEP mode with WFE instruction The
Regulator parameter is not used for the STM32F2 family and is kept as
parameter just to maintain compatibility with the lower power families (STM32L).
Exit: Any peripheral interrupt acknowledged by the nested vectored interrupt controller
(NVIC) can wake up the device from Sleep mode.
Stop mode
In Stop mode, all clocks in the 1.2V domain are stopped, the PLL, the HSI, and the HSE
RC oscillators are disabled. Internal SRAM and register contents are preserved. The
voltage regulator can be configured either in normal or low-power mode. To minimize the
consumption In Stop mode, FLASH can be powered off before entering the Stop mode
using the HAL_PWREx_EnableFlashPowerDown() function. It can be switched on again by
software after exiting the Stop mode using the HAL_PWREx_DisableFlashPowerDown()
function.
Entry: The Stop mode is entered using the
HAL_PWR_EnterSTOPMode(PWR_MAINREGULATOR_ON) function with:
Main regulator ON.
Low Power regulator ON.
Exit: Any EXTI Line (Internal or External) configured in Interrupt/Event mode.
Standby mode
The Standby mode allows to achieve the lowest power consumption. It is based on
the Cortex-M3 deep sleep mode, with the voltage regulator disabled. The 1.2V domain
is consequently powered off. The PLL, the HSI oscillator and the HSE oscillator are
also switched off. SRAM and register contents are lost except for the RTC registers,
RTC backup registers, backup SRAM and Standby circuitry. The voltage regulator is
OFF.
Entry:
The Standby mode is entered using the HAL_PWR_EnterSTANDBYMode()
function.
Exit:
WKUP pin rising edge, RTC alarm (Alarm A and Alarm B), RTC wake-up,
tamper event, time-stamp event, external reset in NRST pin, IWDG reset.
Auto-wake-up (AWU) from low-power mode
The MCU can be woken up from low-power mode by an RTC Alarm event, an RTC
Wake-up event, a tamper event or a time-stamp event, without depending on an
external interrupt (Auto-wake-up mode).
RTC auto-wake-up (AWU) from the Stop and Standby modes

ST STM32F2 Specifications

General

Brand	ST
Model	STM32F2
Category	Microcontrollers
Language	English