iar -指令地址寄存器。
程序计数器中存放着正在执行的指令地址。
The program counter store in the executing instructions address.
在这种模式中，指令本身就包含了数据加载的源地址。
In this mode, the instruction itself contains the address from which to load the data.
这表明函数地址将是下一个指令的地址。
This indicates that the function's address will be the address of the next instruction.
可以执行任意的CPU指令，访问任意的内存地址。
It can execute any CPU instruction and reference any memory address.
当前块是包含当前位置(指令指针地址)的代码。
The current block is the code containing the current location, instruction pointer address.
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.
无地址指令NAI ？
无地址指令NAI ？
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