2位数码管显示00-99的89c51单片机电子秒表设计-的程序和电路图

/*应该是2位数码管显示00-99的89c51单片机电子秒表设计的程序和电路图*/P0段选，P2.0个位位选，P2.1十位位选。共阳数码管16M晶振。STRTEQUP2.5STPEQUP2.6CLRREQUP2.7ORG00HAJMPMAINORG0BHAJMPT0INTORG30HMAIN:MOVR0,#20MOVTMOD,#01HMOVTH0,#3CHMOVTL0,#0B0HMOVDPTR,#TABLESETBEASETBET0k1:LCALLDISPJBSTRT,K2LCALLDISPJNBSTRT,$-3AJMPSTARTk2:JBSTP,K3LCALLDISPJNBSTP,STOPK3:JBCLRR,K1LCALLDISPJNBCLRR,CLEARAJMPK3START:SETBTR0AJMPK1STOP:CLRTR0AJMPK2CLEAR:CLRTR0MOV40H,#0AJMPK1T0INT:MOVTH0,#3CHMOVTL0,#0B0HDJNZR0,RTIMOVR0,#20MOVA,40HCJNEA,#99,ADD1MOV40H,#00HCLRTR0AJMPRTIADD1:ADDA,#01HMOV40H,ARTI:RETIDISP:MOVA,40HMOVB,#10DIVAB;//当前值除以10MOV20H,A;//得出的商送给十位MOV21H,B;//得出的余数送给个位CLRP2.0SETBP2.1MOVA,20H;//十位显示MOVCA,@A+DPTRMOVP0,ALCALLDELAYCLRP2.1SETBP2.0MOVA,21H;//个位显示MOVCA,@A+DPTRMOVP0,ARETDELAY:;误差0usMOVR6,#01HDL0:MOVR5,#61HDJNZR5,$DJNZR6,DL0RETTABLE:DB0C0H,0F9H,0A4H,0B0H,99H;//共阳极0-9显示代码DB92H,82H,0F8H,80H,90HEND