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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