阅读:1152回复:3
要不要上拉?
9054的DataBook上说:
All Local Bus internal pull-ups go through a 100k-ohm resistor. All Local Bus internal pull-downs go through a 50k-ohm resistor. All Local I/O pins should have external pull-ups or pull-downs, which depend upon the application and pin polarity. (Use approximately 3k to 10k ohms.) This is recommended due to the weak value of the internal pull-ups and pull-downs. 怎么local端的所有引脚有都要加上拉或下拉??? 真的要把所有的local pins都加吗? |
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沙发#
发布于:2003-08-26 11:29
和你的应用有关,先都连上没有坏处!
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板凳#
发布于:2003-08-26 16:43
已给分,谢谢回答!
但能不能说得更清楚些?跟什么应用有关? 我看9054RDK上的LD[31..0]就没有接上下拉。其它local pins都接了的!不知道为什么。 |
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地板#
发布于:2003-08-28 14:15
没有绝对的,还是得在实验中得出结论,看看到底要不要上拉或下拉! :D
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