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TL16C554芯片回环测试问题

Other Parts Discussed in Thread: TL16C554

用TL16C554已经实现了发送数据没有问题

接收数据出现以下问题

发送一串数据,在回环测试中总读不出最后一字节数据

发送单个字符的时候,LSR0显示有数据,读出的永远是0x00

请大神们解答到底是什么问题