Before entering Power-down mode, how does a user configure I/O pins to avoid the leakage problem?

[a_ziliu]

Before entering Power-down mode, the user needs to configure I/O pins based on the setting of peripheral applications. If the I/O pin function is set as PWM output, the output is high or low level depending on the state of the peripheral Power-down mode (at this time, it cannot be configured by GPIO output; to use the GPIO output again, it needs to be re-configured as GPIO output). If the I/O pin is not used, it can be set as Quasi-bidirectional mode to avoid pin floating.