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你是说跃变的时间么?
我记得MSP430F149管脚捕获的最小时间是50-62ns. 在数据手册中有这个参数。这个参数的实际意义是从管脚跳变后到中断标志置位的时间,实际触发中断需要的时间会更短,但为了确保中断触发有效,设计是尽量不要低于这个值。