IC200PNS002单路脉冲输入的外部方向控制加/减计数。即有一个脉冲输入端，有一个方向控制端，方向输入信号等于1时，加计数；方向输入信号等于0时，减计数。如图2所示外部方向控制的单路加/减计数。两路脉冲输入的双相正交计数。即有两个脉冲输入端，输入的两路脉冲A 相、B相，相位互差90°（正交），A 相超前B相90°时，加计数；A 相滞后B相90°时，减计数。在这种计数方式下，可选择1x 模式（单倍频，一个时钟脉冲计一个数）和4x 模式（四倍频，一个时钟脉冲计四个数）。

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