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6678的UART接口如何扩展422接口?



6678开发板上把UART的收发的2跟线转成3.3V电平,然后接了个max?的232电平转换芯片就输出了

422的话就直接换一个max?的422电平转换芯片就可以了?

不需要参考时钟什么的吗?还有只有收发2跟线,怎么实现中断方式的接收数据

UART手册说的什么外部参考时钟分频的,哪有外部时钟输入引脚啊?