如何TRIS未使用的I/O引脚

大家好，我使用PIC18F4620 40PIN DIP封装，大约30的I/O引脚没有使用。我不知道我应该把它们留在硬件中，还是应该把它们绑定到VDD或VSS？在软件中也推荐使用未使用的I/O引脚。TrIS＝1还是0？BTW目前未使用的引脚在硬件中浮动，并且在软件中没有包含tiS分配。董事会表现出怪异的行为。当有人靠近板时会重新设置。只是足够接近而不接触它。董事会的上述怪异行为可能是由于未使用的I/O引脚在板上的方式，还是由于其他原因？主时钟是外部XTAR振荡器20MHz，每个陶瓷盖2个22PF。只要没有人在电路板1英尺的范围内，电路板运行良好。任何帮助都值得赞赏。



      以下为原文

    Hi everyone
I am using PIC18F4620 40Pin DIP package and about 30 of its I/O pins are unused.
I wonder should i leave them floating in the hardware or should i tie them to Vdd or Vss?
Also in the software what is recommended for unused I/O pins.. TRIS=1 or 0?

BTW at present the unused pins are floating in the hardware and no TRIS assignment is included in the code in the software. The board is showing weird behavior.. gets reset when someone comes in close proximity to the board.. just close enough without touching it.

Is it possible that the above weird behavior of the board is due to the way the unused I/O pins are on the board or it can also be due to some other reason?

The primary clock is external XTAL Oscillator 20MHz with 2 ceramic caps 22pF each.
The board runs fine so long as no one is within a range of 1 ft from the board.

Any help is appreciated.