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msp430 的USCI 问题

Other Parts Discussed in Thread: MSP430G2553

1.问下msp430 的USCI里面的UCAX TXBUF有数据就通过引脚发出去么,空了就触发中断;

这里 开完总中断后是先运行 这句话呢UCA0TXBUF = *SPI_Tx_Buffer;,还是先触发中断,这段程序出自msp430g2553 USCI SPI 模式读写TF卡程序,例程。按照程序的意思,应该先赋值,但是UCA0TXBUF 空了中断不是也触发了么。,迷惑,求解,谢谢!