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请教大家，外部器件的3.3V TTL电平 怎么和MSP430F149的P1.0连接呢 我想通过P1.0读取外部TTL电平，需要接上拉电阻吗？如果需要 改怎么接上拉电阻呢？
不是必须
意思就是可以不接上拉电阻吗？
430 IO 内部 自带 上下拉电阻
