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C6657 STK uart 波特率过高无法正常收发

Hello,

      使用C6657开发板STK uart例程,源程序设置波特率为115200,收发正常;波特率低于115200(测试最低到9600)时,收发正常;波特率较高时无法正常收发,具体经测试波特率超过117600时接收出现RXFIFOE错误,发送到串口显示的数据错误。求解!