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1. 四路一共容性负载不超过50pF。
2. 您指的在HCS08输出和MCU输入之间加退耦电容吗?还是在输出和地之间加电容?
串联加电容目的是隔直流,如果退耦是输出接电容到地,则增加了容性负载,也不建议。
如果像您说的trace比较长的话,建议先实验验证下,从而确认是否能正常传输,信号有没有发生衰减之类的。