Power control (PWR) RM0033
68/1381 RM0033 Rev 9
The voltage regulator is always enabled after Reset. It works in three different modes
depending on the application modes.
• In Run mode, the regulator supplies full power to the 1.2 V domain (core, memories
and digital peripherals).
• In Stop mode the regulator supplies low power to the 1.2 V domain, preserving the
content of registers and internal SRAM.
• In Standby mode, the regulator is powered down. The content of the registers and
SRAM are lost except for the Standby circuitry and the backup domain.
Note: Depending on the selected package, the voltage regulator can be deactivated. For more
details, refer to the Voltage regulator section in STM32F2xx datasheets.
4.2 Power supply supervisor
4.2.1 Power-on reset (POR)/power-down reset (PDR)
The device has an integrated POR/PDR circuitry that allows proper operation starting
from/down to 1.8 V.
The device remains in Reset mode when V
DD
/V
DDA
is below a specified threshold,
V
POR/PDR
, without the need for an external reset circuit. For more details concerning the
power-on/power-down reset threshold, refer to the electrical characteristics of the
datasheet.
Figure 5. Power-on/power-down reset waveform
V
DD
/V
DDA
Reset
40 mV
hysteresis
POR
PDR
Temporization
t
RSTTEMPO
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