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DM642的经真是多少啊？SEEDDM642-wait()函数是什么意思呢？
DM642的晶振是多少？
DM642的输入晶振范围，情况下面列表：
SEEDDM642-wait()
这个函数要看合众达提供的库里面咋定义的，或在工程里找找。一个延时函数。
