A3986不是下降沿触发么？
资料是这么说的：STEP A low-to-high transition on the STEP input sequences
the translator and advances the motor one increment. The
translator controls the input to the DACs as well as the direction
of current flow in each winding. The size of the increment
is determined by the state of the MSx inputs. 那个资料，大半单词不认得- -
我对这段半懂半不懂的资料的结论是：上升沿触发！
但我看了网友的电路和解释，貌似是说下降沿触发！ OK问题确定了！
上升沿触发！
我自己没有看清楚，不好意思啦！
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