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280041FLSH内存读取问题咨询

Other Parts Discussed in Thread: UNIFLASH

280049切换280041时出现了flsh地址读取出错,在280041芯片中看到数据只能到0x88000,之后数据写不进去,但芯片手册上的结束地址是0x8ffff。
手册上0x88000~0x8FFFF是有flash划分的,但在用仿真器烧录后这一部分空间却无任何数据。
请帮忙分析可能是什么原因?
谢谢。