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MSP430G2553的IIC问题!

我看了TI官方提供的LaunchPad的官方例程,对于主机接收从机的例程里面,为什么主机是接收从机的数据,初始化的时候也是开接收中断,为什么在中断程序中__interrupt void USCIAB0TX_ISR(void)

{   RXData = UCB0RXBUF;                       // Get RX data 

__bic_SR_register_on_exit(CPUOFF);        // Exit LPM0

 }

这为什么用的是发送中断向量啊,不解啊???