要保留未使用的I / O引脚以备将来用作输入引脚或防止I / O引脚驱动，请定义一个输入引脚并将其分配给您希望保留的I / O引脚。 MAX + PLUS II编译器将对此引脚进行三态。使用这种保留引脚的方法时，必须将此引脚连接到电路板上的信号，以防止通过“浮动”引脚产生噪声。如果您没有将此引脚分配给引脚编号，MAX + PLUS II将将其删除。
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