HELP中的迷惑

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普通 普通 如何晋级?

HELP中的迷惑

987

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2004-10-28 10:44:24

各位大虾解释一下,我在看step7 5.2的help时出现迷惑:发现地址上升沿检测和地址下降沿检测指令的解释怎么都一个样?
上升沿检测:POS (Address Positive Edge Detection) compares the signal state of with the signal state from the previous scan, which is stored in . If the current RLO state is "1" and the previous state was "0" (detection of rising edge), the RLO bit will be "1" after this instruction.

下降沿检测:NEG (Address Negative Edge Detection) compares the signal state of with the signal state from the previous scan, which is stored in . If the current RLO state is "1" and the previous state was "0" (detection of rising edge), the RLO bit will be "1" after this instruction.


各位大虾解释一下!

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