STM32F070F6 datasheet(14/83 Pages) STMICROELECTRONICS

14 / 83 page

Functional overview

STM32F070CB/RB/C6/F6

14/83

DocID027114 Rev 3

3.5.4

Low-power modes

The STM32F070CB/RB/C6/F6 microcontrollers support three low-power modes to achieve

the best compromise between low power consumption, short startup time and available

wakeup sources:

•

Sleep mode

In Sleep mode, only the CPU is stopped. All peripherals continue to operate and can

wake up the CPU when an interrupt/event occurs.

•

Stop mode

Stop mode achieves very low power consumption while retaining the content of SRAM

and registers. All clocks in the 1.8 V domain are stopped, the PLL, the HSI RC and the

HSE crystal oscillators are disabled. The voltage regulator can also be put either in

normal or in low power mode.

The device can be woken up from Stop mode by any of the EXTI lines. The EXTI line

source can be one of the 16 external lines and RTC.

•

Standby mode

The Standby mode is used to achieve the lowest power consumption. The internal

voltage regulator is switched off so that the entire 1.8 V domain is powered off. The

PLL, the HSI RC and the HSE crystal oscillators are also switched off. After entering

Standby mode, SRAM and register contents are lost except for registers in the RTC

domain and Standby circuitry.

The device exits Standby mode when an external reset (NRST pin), an IWDG reset, a

rising edge on the WKUP pins, or an RTC event occurs.

Note:

The RTC, the IWDG, and the corresponding clock sources are not stopped by entering Stop

or Standby mode.

3.6

Clocks and startup

System clock selection is performed on startup, however the internal RC 8 MHz oscillator is

selected as default CPU clock on reset. An external 4-32 MHz clock can be selected, in

which case it is monitored for failure. If failure is detected, the system automatically switches

back to the internal RC oscillator. A software interrupt is generated if enabled. Similarly, full

interrupt management of the PLL clock entry is available when necessary (for example on

failure of an indirectly used external crystal, resonator or oscillator).

Several prescalers allow the application to configure the frequency of the AHB and the APB

domains. The maximum frequency of the AHB and the APB domains is 48 MHz.

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