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RM0008
Power control (PWR)
switched off. SRAM and register contents are lost except for registers in the Backup domain
and Standby circuitry (see Figure 4 ).
Entering Standby mode
Refer to Table 12 for more details on how to enter Standby mode.
In Standby mode, the following features can be selected by programming individual control
bits:
●
●
●
●
Independent watchdog (IWDG): the IWDG is started by writing to its Key register or by
hardware option. Once started it cannot be stopped except by a reset. See
Section 17.3 in Section 17: Independent watchdog (IWDG) .
real-time clock (RTC): this is configured by the RTCEN bit in the Backup domain control
register (RCC_BDCR)
Internal RC oscillator (LSI RC): this is configured by the LSION bit in the Control/status
register (RCC_CSR).
External 32.768 kHz oscillator (LSE OSC): this is configured by the LSEON bit in the
Backup domain control register (RCC_BDCR)
Exiting Standby mode
The microcontroller exits Standby mode when an external Reset (NRST pin), IWDG Reset,
a rising edge on WKUP pin or an RTC alarm occurs. All registers are reset after wakeup
from Standby except for Power control/status register (PWR_CSR) .
After waking up from Standby mode, program execution restarts in the same way as after a
Reset (boot pins sampling, vector reset is fetched, etc.). The SBF status flag in the Power
control/status register (PWR_CSR) indicates that the MCU was in Standby mode.
Refer to Table 12 for more details on how to exit Standby mode.
Table 12.
Standby mode
Standby mode
Mode entry
Mode exit
Wakeup latency
Description
WFI (Wait for Interrupt) or WFE (Wait for Event) while:
– Set SLEEPDEEP in Cortex?-M3 System Control register
– Set PDDS bit in Power Control register (PWR_CR)
– Clear WUF bit in Power Control/Status register (PWR_CSR)
WKUP pin rising edge, RTC alarm, external Reset in NRST pin, IWDG
Reset.
Regulator start up. Reset phase
I/O states in Standby mode
In Standby mode, all I/O pins are high impedance except:
●
●
●
Reset pad (still available)
TAMPER pin if configured for tamper or calibration out
WKUP pin, if enabled
Doc ID 13902 Rev 9
61/995
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