的确，这个还真没注意：
The VBAT input supplies power to the RTC and a 32-byte register file during
powerdown and low power modes. This pin can be sourced from the VDD supply or
from a dedicated back-up battery cell. A simple battery isolator consists of a dual
Schottky array with common cathodes. The TWR board example below (Figure 2-6) uses
the BAT54C device to provide battery back-up when the main system power is off. A
100 nF bypass capacitor, placed as near as possible to the MCU, is recommended to
minimize the effects of supply switching events.
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的确，这个还真没注意：
The VBAT input supplies power to the RTC and a 32-byte register file during
powerdown and low power modes. This pin can be sourced from the VDD supply or
from a dedicated back-up battery cell. A simple battery isolator consists of a dual
Schottky array with common cathodes. The TWR board example below (Figure 2-6) uses
the BAT54C device to provide battery back-up when the main system power is off. A
100 nF bypass capacitor, placed as near as possible to the MCU, is recommended to
minimize the effects of supply switching events.
那么其他的芯片接了VBAT也不能连上吗?
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