中断服务程序所在的地址。
当它运行时,它会记录每次系统时钟中断发生时正在执行的指令的地址。
While it is running, it records the address of the instruction that is being executed every time a system-clock interrupt occurs.
它还会注册一个中断服务例程的地址以服务收发无线数据时产生的中断。
It also registers an interrupt service routine's address to service interrupts generated when wireless data is sent or received.
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