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湘潭大学职业技术学院李志斌8255CS接Y0，则8255PA口地址为：8000H，PB口地址为：8001H，PC口地址为：8002H，命令口地址为：8003H273CS接Y2，则273端口地址为：0A000H由原理图知：PA口接列L0~L7，16位字型口左8位PC口接列L8~L15，16位字型口右8位273接行H0~H7PB口接行H8~H15“计”的显示过程演示ORG1000HXPAEQU8000HXPBEQU8001H;-----------------------------------------------------------------------;H-CODE-1x273equ0a000hXPCEQU8002HXPCTLEQU8003HSTART:MOVDPTR,#XPCTLMOVA,#80HMOVX@DPTR,A;写控制字LCALLOFFLED;关显示CLR00HMOVR6,#01HMOVR7,#80H;----------------------------------------X0:MOVR0,#00H;取TAB数X1:LCALLDEL1INCR0INCR0CJNER0,#0E0H,X1X2:MOVR0,#00HX3:LCALLDEL5;取TAB1数INCR0INCR0CJNER0,#80H,X3SJMPX0DISPW:PUSH00H;显示一个字MOVR1,#80H;L-NUMCLRCDISP1:MOVA,R0;BH1MOVDPTR,#TABMOVCA,@A+DPTRmovdptr,#XPCMOVX@DPTR,A;-------------------------------------------INCR0;BH2MOVA,R0MOVDPTR,#TABMOVCA,@A+DPTRMOVDPTR,#XPAMOVX@DPTR,AMOVDPL,R6;X273/XPBMOVDPH,R7MOVA,R1;L0----L7CPLAMOVX@DPTR,Amovr3,#80hdjnzr3,$LCALLOFFLEDINCR0MOVA,R1RRCAMOVR1,AJNCDISP1JB00H,EXIT;----------------------------------SETB00HCLRCMOVR1,#80HMOVR6,#00HMOVR7,#0A0HAJMPDISP1EXIT:MOVR6,#01HMOVR7,#80HCLR00HPOP00HRETDISPW1:PUSH00H;MOVR1,#80H;CLRCDISP2:MOVA,R0;MOVDPTR,#TAB1MOVCA,@A+DPTRmovdptr,#XPCMOVX@DPTR,A;-------------------------------------------INCR0;MOVA,R0MOVDPTR,#TAB1MOVCA,@A+DPTRMOVDPTR,#XPAMOVX@DPTR,A;-------------------------------------------MOVDPL,R6MOVDPH,R7MOVA,R1CPLAMOVX@DPTR,Amovr3,#80hdjnzr3,$LCALLOFFLEDINCR0MOVA,R1RRCAMOVR1,AJNCDISP2JB00H,EXIT1;----------------------------------SETB00HCLRCMOVR1,#80HMOVR6,#00HMOVR7,#0A0HAJMPDISP2EXIT1:MOVR6,#01HMOVR7,#80HCLR00HPOP00HRET;----------------------------------------------------------------------------------TAB:DB00H,00H,00H,00H,00H,00H,00H,00H,00H,00H,00H,00H,00H,00H,00H,00HDB00H,00H,00H,00H,00H,00H,00H,00H,00H,00H,00H,00H,00H,00H,00H,00HDB00H,00H,00H,80H,01H,00H,3F
