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dsp6747串口FIFO问题帮忙咨询



最近在学习6747的东西,在开发板上调试串口。例程给的代码是将串口设置成non-fifo模式的,而且接收发送都是一个字符一个字符操作。这样感觉效率不高,我想把串口修改为fifo模式的,然后设置8个字节再进中断的,但是一直不成功,难道6747不能设置成FIFO模式,我看datasheet说是可以啊,有没有高手指点一下?
FCR = 0x87;
IER = 0x07;
LCR = 0x03;
MCR = 0;
这样设置了以后,还是接收一个字符就进中断了,这是为什么呢?还有需要设置什么的吗?