Datasheet

Functional overview STM32F765xx STM32F767xx STM32F768Ax STM32F769xx
36/255 DocID029041 Rev 6
The RTC clock sources can be:
• A 32.768 kHz external crystal (LSE)
• An external resonator or oscillator(LSE)
• The internal low power RC oscillator (LSI, with typical frequency of 32 kHz)
• The high-speed external clock (HSE) divided by 32
The RTC is functional in V
BAT
mode and in all low-power modes when it is clocked by the
LSE. When clocked by the LSI, the RTC is not functional in V
BAT
mode, but is functional in
all low-power modes.
All RTC events (Alarm, WakeUp Timer, Timestamp or Tamper) can generate an interrupt
and wakeup the device from the low-power modes.
2.21 Low-power modes
The devices 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
The Stop mode achieves the lowest power consumption while retaining the contents of
SRAM and registers. All clocks in the 1.2 V domain are stopped, the PLL, the HSI RC
and the HSE crystal oscillators are disabled.
The voltage regulator can be put either in main regulator mode (MR) or in low-power
mode (LPR). Both modes can be configured as follows (see Table 5: Voltage regulator
modes in stop mode):
– Normal mode (default mode when MR or LPR is enabled)
– Under-drive mode.
The device can be woken up from the Stop mode by any of the EXTI line (the EXTI line
source can be one of the 16 external lines, the PVD output, the RTC alarm / wakeup /
tamper / time stamp events, the USB OTG FS/HS wakeup or the Ethernet wakeup and
LPTIM1 asynchronous interrupt).
• Standby mode
The Standby mode is used to achieve the lowest power consumption. The internal
voltage regulator is switched off so that the entire 1.2 V domain is powered off. The
PLL, the HSI RC and the HSE crystal oscillators are also switched off. After entering
Table 5. Voltage regulator modes in stop mode
Voltage regulator
configuration
Main regulator (MR) Low-power regulator (LPR)
Normal mode MR ON LPR ON
Under-drive mode MR in under-drive mode LPR in under-drive mode
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