IC200PNS002單路脈沖輸入的外部方向控制加/減計數(shù)。即有一個脈沖輸入端，有一個方向控制端，方向輸入信號等于1時，加計數(shù)；方向輸入信號等于0時，減計數(shù)。如圖2所示外部方向控制的單路加/減計數(shù)。兩路脈沖輸入的雙相正交計數(shù)。即有兩個脈沖輸入端，輸入的兩路脈沖A 相、B相，相位互差90°（正交），A 相超前B相90°時，加計數(shù)；A 相滯后B相90°時，減計數(shù)。在這種計數(shù)方式下，可選擇1x 模式（單倍頻，一個時鐘脈沖計一個數(shù)）和4x 模式（四倍頻，一個時鐘脈沖計四個數(shù)）。

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