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介绍了扩展IntelMCS－51系列单片机外中断的几种方法，对这几种方法从基本原理、实施方法等几方面进行了分析，实际应用表明：这些方法的使用都取得了较好的效果．
Several methods to extend the external interrupt of IntelMCS-51 series MCU are introduced. The basic principles and implementation methods of these methods are analyzed. The practical application shows that the use of these methods has achieved good results.