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ORG 0000H AJMP MAIN ORG 000BH AJMP TIME ORG 0300H MAIN: mov 20H,#00H MOV 21H,#00H MOV 22H,#00H MOV 23H,#00H MOV IP,#02H ;IP,IE初始化 MOV IE,#82H MOV TMOD,#01H ;设定定时器工作方式1 MOV TL0,#0B0H MOV TH0,#3CH SETB TR0 ;启动定时T0 MOV SP,#40H ;重设堆栈指针 NEXT: LCALL DISP ;调用显示子程序 LCALL KEY ;调用按键检测子程序 JZ NEXT LCALL ANKEY ;调用按键处理子程序 SJMP NEXT ;重新循环 NOP NOP NOP ;定时中断处理程序：************************************************ TIME: PUSH ACC ;保护现场 PUSH PSW MOV TL0,#0B0H ;赋定时初值 MOV TH0,#3CH INC 20H ; MOV A,20H CJNE A,#20,RETI1 MOV 20H,#00H ;一秒钟时间到 MOV A,21H ADD A,#01H DA A MOV 21H,A CJNE A,#60H,RETI1 MOV 21H,#00H ;一分钟时间到 MOV A,22H ADD A,#01H DA A MOV 22H,A CJNE A,#60H,RETI1 MOV 22H,#00H ;一小时时间到 MOV A,23H ADD A,#01H DA A MOV 23H,A CJNE A,#24H,RETI1 MOV 23H,#00H ;到时间达到24小时,清零. RETI1: POP PSW ;恢复现场 POP ACC RETI ;中断返回 NOP NOP ;**************************************************** ;显示子程序 ;**************************************************** DISP: ANL 2FH,#10H ;处理小数点 MOV A,21H ;处理秒21H-->2DH,2EH ANL A,#0FH ORL A,2FH MOV 2FH,A MOV A,21H ANL A,#0F0H SWAP A MOV 2EH,A ANL 2DH,#10H MOV A,22H ;处理分钟22H-->2CH,2DH ANL A,#0FH ORL A,2DH MOV 2DH,A MOV A,22H ANL A,#0F0H SWAP A MOV 2CH,A ANL 2BH,#10H MOV A,23H ;处理小时23H-->2AH,2BH ANL A,#0FH ORL A,2BH MOV 2BH,A MOV A,23H ANL A,#0F0H SWAP A MOV 2AH,A MOV R0,#2FH ;显示偏移量 MOV R3,#06H MOV DPTR,#TABLE MOV A,#0BFH LOOP1: MOV B,A MOV P2,A MOV A,@R0 MOVC A,@A+DPTR MOV P0,A ;送显示 MOV R2,#80H ;延时 DJNZ R2,$ DEC R0 MOV A,B RR A DJNZ R3,LOOP1 ;循环显示 RET TABLE: DB 28h,7eh,0a2h,62h,74h,61h,21h ;不带小数点 DB 7ah,20h,60h,00,00,00,00,00,00 DB 8H,5eH,82H,42H,54H,41H,1H,5aH ;带小数点 DB 00H,40H,00,00,00,00,00,00 NOP NOP ;***************************************************** ;按键判断程序 ;***************************************************** KEY: MOV P3,#0FFH MOV A,P3 CPL A ANL A,#3CH JZ RETX ;无键按下则返回 LCALL DISP LCALL DISP MOV A,P3 CPL A ANL A,#3CH JZ RETX ;键盘去抖动。 MOV R6,A ;将键值存入R6。 LOOP2: LCALL DISP MOV A,P3 CPL A ANL A,#3CH JNZ LOOP2 ;等待键释放 MOV A,R6 RETX: RET NOP NOP ;***************************************************** ;按键处理子程序 ;***************************************************** ANKEY: CLR EA ;关中断 LX: MOV A,R6 JB ACC.2,L1 ;是功能键转L1 JB ACC.3,L2 ;是确认键转L2 JB ACC.4,L3 ;是减1键转L3 JNB ACC.5,L12 ;不是增1键，转L12 JB 2BH.4,L6 ;判断使哪一位（时、分、秒）的值加1 JB 2DH.4,L8 JB 2FH.4,L9 L12: LCALL DISP LCALL DISP LCALL KEY ;判断有无键按下。 JZ L12 LJMP LX L2: MOV 25H,#00H ;确认键处理程序 CLR 2BH.4 CLR 2DH.4 CLR 2FH.4 SETB EA RET L3: JB 2BH.4,L61 ;增一键处理程序 JB 2DH.4,L81 JB 2FH.4,L91 AJMP L12 L1: MOV A,25H ;功能键处理程序 JZ LB1 JB ACC.0,LB2 JB ACC.1,LB3 JNB ACC.2,L12 LB1: MOV 25H,#01H ;25H单元是标志位，（25H）=01H调节时单元的值 SETB 2BH.4 CLR 2DH.4 CLR 2FH.4 AJMP L12 LB3: MOV 25H,#04H ;25H单元是标志位，（25H）=01H调节秒单元的值 SETB 2FH.4 CLR 2DH.4 CLR 2BH.4 AJMP L12 LB2: MOV 25H,#02H ;25H单元是标志位，（25H）=01H调节分单元的值 SETB 2DH.4 CLR 2BH.4 CLR 2FH.4 AJMP L12 L61: AJMP L611 L81: AJMP L811 L91: AJMP L911 L6: MOV A,23H ;时加一 ADD A,#01H DA A MOV 23H,A CJNE A,#24H,L15 L15: JC L112 MOV 23H,#00H L112: AJMP L12 L8: MOV A,22H ;分加一 ADD A,#01H DA A MOV 22H,A CJNE A,#60H,L16 L16: JC L112 MOV 22H,#00H AJMP L12 L9: MOV A,21H ;秒加一 ADD A,#01H DA A MOV 21H,A CJNE A,#60H,L17 L17: JC L112 MOV 21H,#00H AJMP L12 L611: MOV A,23H ;时减一 ADD A,#99H DA A MOV 23H,A CJNE A,#99H,L112 MOV 23H,#23H AJMP L12 L811: MOV A,22H ;分减一 ADD A,#99H DA A MOV 22H,A CJNE A,#99H,L112 MOV 22H,#59H AJMP L12 L911: MOV A,21H ;秒减一 ADD A,#99H DA A MOV 21H,A CJNE A,#99H,L112 MOV 21H,#59H AJMP L12 NOP NOP END
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