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使用MSP430FR5994开发板串口UCA2时无法顺利通信

中断函数配置和串口寄存器配置如上,使用UCA0、1、3时均能够完成通信与转发。使用该UCA2串口时则无法进行通信。请问是否需要其余的配置或目前的寄存器配置是否有什么异常之处?