CHAPTER 7-2: VBAT Domain(A)
248 FM4 Peripheral Manual, Doc. No. 002-04856 Rev. *E
2. Configuration of VBAT Domain
This section explains the internal configuration of the VBAT Domain.
Internal Configuration of VBAT Domain
Figure 2-1 shows the internal configuration of the VBAT Domain and the connection between the VBAT
Domain and the Always-on Domain.
Figure 2-1 Internal Configuration of VBAT Domain and Connection between VBAT Domain and Always-on Domain
RTC
This is a calendar circuit with the frequency compensation function.
32 kHz oscillation circuit (32K OSC)
This is an oscillation circuit that can be connected to a (32768 Hz) crystal oscillator for clocks.
Power-on circuit (PON)
This detects the power-on of the VBAT Domain and generates the circuit initialization signal.
Backup register
This 32-byte register retains data while power is being supplied to the VBAT power supply pin.
VBAT I/O ports (P46 to 49, Port Control)
They are I/O ports driven by power supplied from the VBAT power supply pin.
The control circuit for the VBAT I/O ports is independent of the control circuit for other than I/O ports
except P46 to P49.
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