1）指定初始值 CNO＝0，初始值为0，CNO＝1，初始值为1。
2）指定加或减计数器 UPDOWN=0，做加法计数器；UPDOWN＝1，做减法计数器。
注：做减法计数器时初始值就是预置值，与CNO无关。不论是做加法还是减法计数器，预置值都是从CRT／MDI面板上通过键入设定的。
3）复位 RST＝0，不复位；RST＝1，复位，复位时R1变为“0”，计数器的累加值变为初始值。
4）计数信号 ACT＝0，计数器不工作；ACT＝l，计数器信号的上升沿触发工作。即ACT每通一次，计数器加1或减1。
5）R1输出 当计数器累加到预置值时R1=1。R1的地址可任意确定。计数器的计数范围是从0000～9999。
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