如果MSP430F149的一个管脚A设为输入,这个管脚接一个芯片的管脚B,B是漏极开路电路,要读取B的信号,是否要加上拉或下拉?
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如果MSP430F149的一个管脚A设为输入,这个管脚接一个芯片的管脚B,B是漏极开路电路,要读取B的信号,是否要加上拉或下拉?