CHAPTER 7-3: VBAT Domain(B)
FM4 Peripheral Manual, Doc. No. 002-04856 Rev. *E 301
On-chip Power Gating
In deep standby RTC mode and deep standby stop mode, this family cuts off the power supply for the
CPU Domain by using the power switch function built in the chip.
The Always-ON Domain keeps the power supply on even in deep standby RTC mode and deep standby
stop mode.
For details of deep standby RTC mode and deep standby stop mode, see Chapter "Low Power
Consumption Mode".
Off-chip Power Gating
If the system power supply supplying power to the VCC pin of this family is cut off, the power supply for
the CPU Domain and that for the Always-on Domain are cut off.
In this situation, the power supply for the VBAT Domain can remain on if a backup power supply supplies
power to the VBAT Domain.
The on-board regulator, which controls the system power supply with an alarm time set in the RTC or with
a signal input from an external pin, can be turned on or off.
Figure 1-1 Power Supply Configuration of FM4 Family
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