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【简答题】
8051 的引脚 是 脚 (IN 脚还是 OUT 脚 ) ,当其端出现平时 ,8051 进入复位状态。 8051 一直维持这个值,直到 RST 脚收到低电平, 8051 才脱离复位状态,进入程序运行状态,从 ROM 0000 H 单元开始取指令并翻译和执行。
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