TRST pin can be pulled down.
Since the internal pull-up MOS is turned ON, small amount of current flows when TRST pin is pulled down externally.
It results in no damage to chip reliability.
A following process can stop this small amount of current.
The normal operation starts after the power-on reset.
Then, PTG3 of the Pin Function Controller can be set Port input (pull-up MOS: Off) with PG3MD1=1,PG3MD0=1.