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.
帮助文件已经解释得很清楚了啊:POS的功能是比较输入信号(地址1)与其上一扫描周期的状态(上一周期状态被存在地址2)。如果现在的信号RLO是1,并且上一周期的状态是O(发现上升沿),则RLO位则被设置为1。
简单来说实际上它的功能也就是在输入信号由0变为1的那个扫描周期输出结果为1,其它情况都输出为0。
下降沿检测的意思类推就行了。