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1、题目实时时钟的设计与实现姓名:学院：计算机与控制工程学院指导老师：邱秀芹时间：20141218一、设计内容：设计并实现实时时钟并通过LED显示时、分、秒1二、设计要求：①、通过8253产生1s信号中断信号。②、每秒钟产生中断，在中断子程序中修改时间。③、在LED上显示时、分、秒。④、通过键盘修改时钟。三、程序流程图：本次试验主要用到了8254，8255,825923四、硬件接线图图18259内部连续及外部管脚引出图图28254技术应用实验接线图4图38255键盘扫描及数码管显示实验线路图五、程序代码MY8255_AEQU0600HMY8255_BEQU0602HMY8255_C
2、EQU0604HMY8255_CONEQU0606HA8254EQU06C0H;计数器0的接口地址CON8254EQU06C6H;控制口SSTACKSEGMENTSTACKDW64DUP(?)SSTACKENDSDATASEGMENTTEMPWORDDW0000H;放置当前要调的是哪一位TEMPTDB01H,00H,00H;临时数据5TIMEDB00H,00H,00H;时、分、秒DTABLEDB3FH,06H,5BH,4FH,66H,6DH,7DH,07H;定义16进制数字DB7FH,6FH,77H,7CH,39H,5EH,79H,71HDATAENDSCODESEGMENTA
3、SSUMECS:CODE,DS:DATASTART:PUSHDSPUSHSIMOVAX,0000HMOVDS,AXMOVAX,OFFSETIRQ7;取中断入口地址MOVSI,00C4H;中断矢量地址MOV[SI],AX;填IRQ7的偏移矢量MOVAX,CS;段地址MOVSI,00C6HMOV[SI],AX;填IRQ7的段地址矢量CLIPOPSIPOPDS;初始化主片8259MOVAL,11HOUT20H,AL;ICW1MOVAL,08HOUT21H,AL;ICW2MOVAL,04H;表明，IR2接口上接从片OUT21H,AL;ICW3MOVAL,01HOUT21H,AL;ICW
4、4;从片MOVAL,11HOUT0A0H,AL;ICW1MOVAL,30HOUT0A1H,AL;ICW2MOVAL,02HOUT0A1H,AL;ICW3,终端类型码是010，中断源是IR2MOVAL,01HOUT0A1H,AL;ICW4MOVAL,0FDHOUT0A1H,AL;OCW1=11111101B,只有IR1不被屏蔽MOVAL,6BHOUT21H,AL;主片8259，OCW1(IR7,IR4,IR2不被屏蔽)STI;时钟显示MOVAX,DATAMOVDS,AX6MOVSI,3000HMOVAL,00HMOV[SI],AL;清显示缓冲MOV[SI+1],ALMOV[SI+
5、2],ALMOV[SI+3],ALMOV[SI+4],AL;第2个LEDMOV[SI+5],AL;第1个LEDLEADI,TIMEMOVDX,MY8255_CON;写8255控制字MOVAL,81H;A,B口式0，C口下半部输入，其他口输出OUTDX,AL;计数器PUSHDXPUSHAXMOVDX,CON8254MOVAL,00110000B;计数器0，16位计数，方式0，二进制OUTDX,ALMOVDX,A8254MOVAL,00H;计数初值为18432（十进制）OUTDX,AL;写低8位MOVAL,48H;写高8位OUTDX,ALSTIPOPAXPOPDXBEGIN:CAL
6、LDIS;调用显示子程序CALLCLEAR;清屏CALLCCSCAN;扫描JNZINK1JMPBEGININK1:CALLDISCALLDALLYCALLDALLYCALLCLEARCALLCCSCANJNZINK2;有键按下，转到INK2JMPBEGIN;确定按下键的位置INK2:MOVCH,0FEHMOVCL,00HCOLUM:MOVAL,CHMOVDX,MY8255_AOUTDX,ALMOVDX,MY8255_C7INAL,DX;IN为输入字节或字L1:TESTAL,01H;isL1?JNZL2MOVAL,00H;L1JMPKCODEL2:TESTAL,02H;isL2?
7、JNZL3MOVAL,04H;L2JMPKCODEL3:TESTAL,04H;isL3?JNZL4MOVAL,08H;L3JMPKCODEL4:TESTAL,08H;isL4?JNZNEXTMOVAL,00H;L4ADDAL,CLCALLSETIME;用来确定是调时还是调分还是调秒还是清零JMPCONTINUEKCODE:ADDAL,CLCALLPUTBUFCONTINUE:PUSHAXKON:CALLDIS;调用显示子程序CALLCLEAR;清屏CALLCCSCAN;扫描JNZKONPOP
