Datasheet

DocID028087 Rev 4 27/193
STM32F412xE/G Functional overview
42
A comprehensive set of power-saving mode allows to design low-power applications.
When the internal reset is OFF, the following integrated features are no longer supported:
• The integrated power-on reset (POR) / power-down reset (PDR) circuitry is disabled.
• The brownout reset (BOR) circuitry must be disabled.
• The embedded programmable voltage detector (PVD) is disabled.
• V
BAT
functionality is no more available and VBAT pin should be connected to V
DD
.
3.19 Voltage regulator
The regulator has three operating modes:
– Main regulator mode (MR)
– Low power regulator (LPR)
– Power-down
3.19.1 Regulator ON
On packages embedding the BYPASS_REG pin, the regulator is enabled by holding
BYPASS_REG low. On all other packages, the regulator is always enabled.
Figure 7. Power supply supervisor interconnection with internal reset OFF
(1)
1. The PRD_ON pin is available only on WLCSP64, UFBGA100, UFBGA144 and LQFP144 packages.
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