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5509外部RAM数据问题

我在计算的过程中,将一些变量分配到外部RAM里面,如果我设置一个断点,让程序停到断点处,不停地刷新这些变量的显示,发现这些变量的值会出现变化,但是如果将这些变量定义到内部RAM里就没有这种情况。出现这种情况正常吗?如果不正常,问题可能出在哪个地方呢?哪位遇到过类似的情况?