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为何无法对5509A的看门狗寄存器进行操作



最近在做一个工程,想把5509A的看门狗用上,但是始终无法实现对寄存器的操作,在watch窗口,寄存器显示不识别,在view->registers->peripheral regs 只看到iodir和iodata,看不到看门狗寄存器,为什么?