CHAPTER 7-3: VBAT Domain(B)
FM4 Peripheral Manual, Doc. No. 002-04856 Rev. *E 323
Driving VBAT Power Supply with battery
Transition of power supply state
Figure 3-2 shows how the state of power supply transits when a battery is used as the VBAT power
supply. Figure 3-3 shows the respective waveforms of circuits.
Power-on bit (PON) in the VDET Register indicates whether the system power supply has been turned on
for the first time.
If the system power supply has been turned on for the first time, do the settings of the circuits in the VBAT
Domain.
Figure 3-2 Transition of states with Battery Used as VBAT Power Supply
Figure 3-3 Example of Waveforms for Using Battery
(1) Starting from the CPU reset vector
(2) Setting of the VBAT Domain
To Next Page
Loading...
