單片機(jī)課程設(shè)計(jì)：單片機(jī)控制的倒計(jì)時(shí)牌論文)word格式-資料下載頁
2024-12-07 10:08本頁面
【導(dǎo)讀】顯示距倒計(jì)時(shí)時(shí)刻還有多長時(shí)間；本倒計(jì)時(shí)牌以AT89C51單片機(jī)作為核心，最長可以倒計(jì)時(shí)100天。式為年（四位），月（兩位），日（兩位）。倒計(jì)時(shí)牌天、時(shí)、分、秒的計(jì)時(shí)分別利用100、24、60、60進(jìn)制自減計(jì)數(shù)來實(shí)現(xiàn)。月（兩位），日（兩位）。、控制電路及顯示接口電路。倒計(jì)時(shí)牌具有如下工作狀態(tài)：設(shè)置狀態(tài)和運(yùn)行狀態(tài)。這時(shí)要設(shè)置倒計(jì)時(shí)時(shí)間，按K1，開始設(shè)置時(shí)間，這時(shí)設(shè)置的是秒，按一次K2，秒加1；再按一次K1，設(shè)置分，依次類推；設(shè)置完天后，按K1則啟動(dòng)定時(shí)器，開始倒計(jì)時(shí)。INT1對(duì)應(yīng)的開關(guān)為修改/日歷切換按鈕K2。LED數(shù)碼管顯示的數(shù)據(jù)，并將其存放在緩沖區(qū)中；前須將其數(shù)據(jù)由存放地址單元拆分后傳送至顯示緩沖區(qū)中，再將其傳送至對(duì)應(yīng)的端口。換時(shí)以R3為標(biāo)志位，其中涉及到標(biāo)志位R4，
【正文】 ,A LCALL DL1ms SETB CLR CJNE R2,00H,S0 MOV A,40H SJMP S00 S0: MOV A,48H S00: MOV P1,A LCALL DL1ms SETB LJMP LOOP IT0P: MOV TH0,3CH MOV TL0,0B0H DJNZ R5,RETURN MOV R5,0AH MOV A,33H DEC A MOV 33H,A CJNE A,0FFH,RETURN MOV 33H,3BH MOV A,32H DEC A MOV 32H,A CJNE A,0FFH,RETURN MOV 32H,3BH MOV A,31H DEC A MOV 31H,A CJNE A,0FFH,RETURN MOV 31H,17H MOV A,30H DEC A MOV 30H,A PUSH ACC MOV A,37H INC A INC R1 MOV 37H,A CJNE R1,31,GO1 MOV 36H,07H MOV 37H,01H GO1: CJNE R1,62,GO2 MOV 36H,08H MOV 37H,01H GO2: CJNE R1,93,GO3 MOV 36H,09H MOV 37H,01H GO3: CJNE R1,123,GO4 MOV R1,17 MOV 36H,06H MOV 37H,17 GO4: POP ACC CJNE A,0FFH,RETURN CLR TR0 MOV 30H,00H MOV 31H,00H MOV 32H,00H MOV 33H,00H RETURN:RETI DL1ms:MOV R7,02H DL: MOV R6,0FFH DL6: DJNZ R6,DL6 DJNZ R7,DL RET /*外部中斷 0，天、時(shí)、分、秒的切換及開始倒計(jì)時(shí) */ INT0P:PUSH PSW INC R3 CJNE R3,05H,RETURN1 SETB TR0 MOV R3,00H MOV R4,01H RETURN1:POP PSW RETI /*外部中斷 1 的調(diào)整程序 */ INT1P:PUSH PSW PUSH ACC CJNE R4,00H,NEXT CJNE R3,00H,ADD0 SJMP RETURN2 ADD0: CJNE R3,01H,MM 。秒單元調(diào)整 INC 33H MOV A,33H CJNE A,60,RETURN2 MOV 33H,00H SJMP RETURN2 MM: CJNE R3,02H,HH INC 32H MOV A,32H CJNE A,60,RETURN2 MOV 32H,00H SJMP RETURN2 HH: CJNE R3,03H,DD INC 31H MOV A,31H CJNE A,24,RETURN2 MOV 31H,00H SJMP RETURN2 DD: CJNE R3,04,RETURN2 INC 30H MOV A,30H CJNE A,100,RETURN2 MOV 30H,00H SJMP RETURN2 NEXT: INC R2 CJNE R2,02H,RETURN2 MOV R2,00H RETURN2: POP ACC POP PSW RETI DMB: DB 3FH,06H,5BH,4FH,66H,6DH,7DH,07H,7FH,6FH 。段碼表 END
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