7.2.4 Internal Power Domains

A variety of internal regulated power domains (nominal 1.2v) are as follows:

VDDCORE_BU: This domain powers the backup domain.
VDDCORE_SW: The main voltage domain for the CPU, bus, and most peripherals.
VDDCORE_USB: This domain powers the USB PHY.
VDDCORE_RAM: This domain is used to retain the System SRAM and the PLL.

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