Power controller (PWR) RM0390
96/1328 RM0390 Rev 4
scale 3 is automatically selected.(see Section 5.4.1: PWR power control register
(PWR_CR).
2 operating modes are available:
– Normal mode: The CPU and core logic operate at maximum frequency at a given
voltage scaling (scale 1, scale 2 or scale 3)
– Over-drive mode: This mode allows the CPU and the core logic to operate at a
higher frequency than the normal mode for the voltage scaling scale 1 and scale
2.
• In Stop mode: the main regulator or low-power regulator supplies a low-power voltage
to the 1.2V domain, thus preserving the content of registers and internal SRAM.
The voltage regulator can be put either in main regulator mode (MR) or in low-power
mode (LPR). Both modes can be configured by software as follows:
– Normal mode: the 1.2 V domain is preserved in nominal leakage mode. It is the
default mode when the main regulator (MR) or the low-power regulator (LPR) is
enabled.
– Low voltage mode.
– Under‐drivemode:the1.2Vdomainispreservedinreducedleakagemode.This
modeisonlyavailablewhenthemainregulatororthelow‐powerregulatorisin
lowvoltagemode(see
Table 14).
• 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: Over-drive and under-drive mode are not available when the regulator is bypassed.
For more details, refer to the voltage regulator section in the STM32F446xx datasheet.
Table 14. Voltage regulator configuration mode versus device operating mode
(1)
1. ‘-’ means that the corresponding configuration is not available.
Voltage regulator
configuration
Run mode Sleep mode Stop mode Standby mode
Normal mode MR MR MR or LPR -
Low-voltage mode - - MR or LPR -
Over-drive mode
(2)
2. The over-drive mode is not available when V
DD
= 1.8 to 2.1 V.
MR MR - -
Under-drive mode - - MR or LPR -
Power-down mode - - - Yes
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