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TMS570 MDK Kit LIN2寄存器数据无法读取怎么回事?

采用TMS570 MDK Kit里的TMS570LS20216ZWT板子调试SCI通信功能,有没有人知道连接好CCS后单步调试时没有SCI寄存器显示是怎么回事??然后用LIN2寄存器根本不能读取到待发送数据,所有LIN2寄存器都显示unable to read,只有LIN1寄存器中有值是怎么回事啊??