includeAT89x51h>*****************************************电路连接P1——DB0～DB7P20——RSP21——R
includeAT89x51h>includeintrinsh>defineuintunsignedintdefineucharunsignedchar******************
includeAT89X51H>includeintrinsh>defineuintunsignedintdefineucharunsignedcharsbitrs=P1^2;sbit
