C6713的datasheet里面，关于上拉、下拉电阻的有这样的说明：
IPD = Internal pulldown, IPU = Internal pullup.
[To oppose the supply rail on these IPD/IPU signal pins, use external pullup or pulldown resistors no greater than 4.4 kΩ and 2.0 kΩ, respectively.]
请问这么一句是什么意思：To oppose the supply rail on these IPD/IPU signal pins,
什么是oppose the supply rail？
谢谢！ |
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