51单片机延时3-4秒汇编程序ORG0CLRP3.3SETBP1.2SETBP1.1CLRP3.4MAIN:JBP1.5,NXT1LCALLDISCLRP1.2CLRP1.1SETBP3.3SETBP3.4LCALLMAINNXT1:LCALLDISCLRP3.3CLRP3.4SETBP1.1SETBP1.2LCALLMAINDIS:MOVR3,#40DEL1:MOVR4,#80DEL2:MOVR5,#200