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请教F2812的SCI进入发送中断的问题



SCI的发送中断标志位TXRDY,在系统复位或者SCI复位后的初始值都是1。如果使用SCIA的标准收发模式(SCIFFENA=0),并且在主程序中使能了相应的CPU级、PIE级、SCI级中断,那么是不是会立刻进入SCI发送中断?但是书上又说要先发送一次数据后才能进入发送中断,感觉很迷惑,希望能得到解答啊。~~~~