iteration_count是控制中断模拟循环次数的计数器。
Iteration_count is the count to control the number of iteration of interrupt simulation.
只要计数器是正数，控制器就返回到用户程序。
As long as the counter is positive, control is returned to the user program.
电子计数器能准确控制纸板数量。
The electronic counter can preciously control the carton quantity.
电子计数器可控制成品的分组，以便于装箱。
Electronic counter may control finished products by group for easy use of package.
计数器模式控制寄存器；
计数器模式控制寄存器；
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