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关于MSP430 的UART空闲模式的使用问题

如何利用UART的空闲多机通信模式(IDLE-LINE)的空闲状态检测来判断一帧数据接收完毕,例如,接收一帧数据字节数不定,但可以利用检测总线空闲状态来判断一帧数据接收完毕,状态机进入空闲态后能否产生一个中断?