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TM320FS2812 External Interface接口问题

你好,使用TM320FS2812 的External Interface接口用芯片TL16C754BPN扩展串口,有时候上电后串口接收数据不正常,反复上电后有时能恢复正常,有时不能,但是通过仿真器仿真却没有问题,这是什么问题?之前听别人是是这个DSP总线有一些问题,可以软件改动,不知怎么设置?