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楼主 |
发表于 2012-6-15 15:39:46
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NJ8888 发表于 2012-6-15 11:15 
float不是吗?
按照这个说法
Unused I/O pins will be terminated with a bus-hold "keeper" circuit by default. You can change this by selecting "Float", "Pullup", or "Ground" under "Unused Pin Termination" option in the design tools.
- If you select "Float", unused I/Os will be left floating; you must terminate these pins externally.// 你必须断开这些引脚的外部连接
- If you select "Pullup", unused I/Os will be internally pulled up. You can then choose to either leave these pins floating on the board or to ground them.
- If you select "Ground", all unused I/Os will be internally grounded. You can then choose to either leave these pins floating on the board or to ground them.
float 貌似 不是高阻态 |
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发表于 2012-6-15 11:07:12
