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TL16C554的问题

Other Parts Discussed in Thread: TL16C554

我用TL16C554扩展串口。先在51单片机上试好了,又移植到DSP5509上,用到CPLD。

现在通过串口可以发出数据来,但是波特率不对。

晶振用4M。根据手册,对应波特率9600,8M是DLL=52,

4M是DLL=26。可是我把DLL设成180,才凑出一个600的波特率来。

这差的也太多啦。

请问高手,怎么回事?谢谢!