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芯片为TM4C1294NCPDT
芯片手册上 uart6 的中断向量应该是 75
但是 keil 连接 芯片在线方针 75号是uart3
实际上芯片也是响应的中断 uart3 即死机，
想问一下 ，产生的原因是什么 ，如何修改
