计数器是最常用的时序电路之一，他们不只可以用来指望脉冲，还可以分频，定时，发生跳动的脉搏和其他的时钟信号等。
The counter is the most commonly used one of the sequential circuits, they not only can be used to count on pulse, still can separate frequency, timing, produce beats pulse and other clock signal etc.
介绍了一种对定时器、计数器、数据寄存器的数据进行外部设定并显示的电路，并给出了相应的梯形图程序。
This paper introduces a circuit setting up and displaying the data of timer, counter and data register out of PLC. It gives the ladder-type Patterned program.
该装置用真有效值电路检测非正弦焊接电流值，用中断和定时计数器实现了可控硅的精确触发。
The measuring circuit for RMS of non-Sin welding current and the precise triggers of SCR using interrupt controllers and timers in AduC812 MCU are also described.
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