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.
内存中的一块留用存储区，当程序中断产生时，CPU自动在其中保存程序计数器和工作寄存器的内容。
A reserved area of memory where the CPU automatically saves the program counter and the contents of working registers when a program interrupt occurs.
如果该标志被设置指示快速的中断服务是与因此，只有程序计数器拆散。
If the flag is set it indicates that a fast interrupt was serviced and therefore only the program counter is unstacked.
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