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再MSP430X1系列的USER GUIDE手册中的301页里面有IFG1和IFG2寄存器，他们都包含UTXIFG0寄存器，他们唯一的区别是后面的‘+’，这个是什么意思？
† Does not apply to MSP430x12xx devices. See IE2 for the MSP430x12xx USART0 interrupt enable bits
‡ MSP430x12xx devices only
感谢分享，这个在手册里的小字备注里，要仔细看。
