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msp430F149 UART 问题

Other Parts Discussed in Thread: MSP430F149

我用仿真器调程序,IDE为IAR,芯片型号MSP430F149,程序单步走到while(!(IFG1 & UTXIFG0));处时,不能向下进行。同样的程序配置我在开发板上调试都没有问题,用在自己的设备上就不好用了。请问什么原因能导致UTXIFG0一直为0呢,我主要怀疑硬件的问题