It can execute any CPU instruction and reference any memory address.
可以执行任意的CPU指令，访问任意的内存地址。
Execute a Return from Interrupt instruction;
执行中断返回指令；
If the stack frame is active, this address is the next instruction to execute.
如果堆栈帧处于活动状态，则此地址是要执行的下一条指令。
If the stack frame is active, this address is the next instruction to execute.
如果堆栈帧处于活动状态，则此地址是要执行的下一条指令。
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