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关于TM4C123GH6PZ串口的问题

Other Parts Discussed in Thread: TM4C123GH6PZ

我用TM4C123GH6PZ单片机调试串口,做了一个中断uart4的读写中断,调试过程中,我的uart4的RX什么都没有接,TX也没有发东西,但为什么进入中断了?而且

aa[0]=UARTCharGetNonBlocking(UART4_BASE);我用函数读数据,结果有数据0x0000500之类的。

但是我把RX接到串口转U口的一个板上。。。就正常进入中断了。

难道RX不能悬空?求大侠回答!