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接收器的FIFO:在手册里面说的是接收FIFO的中断产生条件是the FIFO status bits (RXFFST4−0) and FIFO level bits (RXFFIL4−0) match (i.e., are greater than or equal to). 也就是说假如我设置（RXFFST4−0）此位为6，那么当SCI接收到6个字节以后才会产生一个中断，对么？但是我在使用发现和我所理解的不一样，它依然是每接受一个字节就进入一次接收中断。
