AT89C51单片机的数字时钟设计课件.ppt

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1、1.模式0,显示时钟,2.模式1,第1次按KEY1键选择调秒,3.模式2,第2次按KEY1键选择调分,4.模式3,第3次按KEY1键选择调时,KEY1 BIT P1.0KEY2 BIT P1.1KEY3 BIT P1.2CLK BIT P1.3LOAD BIT P1.4DIN BIT P1.5SECOND DATA 30HMINUTE DATA 31HHOUR DATA 32H ORG 0000H AJMP MAIN ORG 000BH AJMP TIMER0MAIN:MOV SP,#60H MOV TMOD,#01H；定时器T0方式设置,MOV TH0,#0B1H；定时器T0装入初值20ms

2、 MOV TL0,#0E0H SETB ET0；T0中断允许 SETB EA；总中断允许 MOV R2,#50；T0中断为1s SETB TR0；启动T0 MOV SECOND,#00H MOV MINUTE,#00H MOV HOUR,#08H ；初始化时间8点00分00秒 MOV A,HOUR时间值送显示缓冲区79H7EH ANL A,#0F0H SWAP A MOV 79H,A,MOV A,HOUR ANL A,#0FH MOV 7AH,A MOV A,MINUTE ANL A,#0F0H SWAP A MOV 7BH,A MOV A,MINUTE ANL A,#0FH MOV 7CH,

3、A MOV A,SECOND ANL A,#0F0H SWAP A MOV 7DH,A MOV A,SECOND ANL A,#0FH MOV 7EH,A MOV R3,#00H；R3初值设为0，显示时钟 ACALL INI7219；调用7219初始化子程序,I NI7219:MOV 50H,#0FH；显示测试寄存器设置 MOV 51H,#00H；非测试模式，正常显示MOV R0,#50HACALL SEND7219MOV 50H,#0CH；关闭显示寄存器MOV 51H,#01H；正常显示MOV R0,#50HACALL SEND7219MOV 50H,#0BH；扫描界限寄存器MOV 51H,

4、#05H；6位显示MOV R0,#50HACALL SEND7219MOV 50H,#0AH；亮度寄存器，其值为000EH，设置为0AH,MOV 51H,#09HMOV R0,#50HACALL SEND7219MOV 50H,#09H；译码方式寄存器MOV 51H,#0FFH；8位显示全部B译码MOV R0,#50HACALL SEND7219RETDISPLAY:MOV 50H,#01H；显示子程序 MOV 51H,79H；显示缓冲区设在79H7EH单元MOV R0,#50H；其内容从左至右一次显示在数码管显示器上ACALL SEND7219MOV 50H,#02HMOV 51H,7AH,

5、MOV R0,#50HACALL SEND7219MOV 50H,#03HMOV 51H,7BHMOV R0,#50HACALL SEND7219MOV 50H,#04HMOV 51H,7CHMOV R0,#50HACALL SEND7219MOV 50H,#05HMOV 51H,7DHMOV R0,#50HACALL SEND7219MOV 50H,#06HMOV 51H,7EHMOV R0,#50HACALL SEND7219RET,SEND7219:CLR LOAD；向7219写入数据子程序 MOV R4,#02H；写入16位串行数据CLR CLOP1: MOV R1,#08H MOV

6、A,R0LOP2: RLC A MOV DIN,C SETB CLK CLR CLK DJNZ R1,LOP2 INC R0 DJNZ R4,LOP1 SETB LOAD RET；键扫描处理子程序KEY: JNB KEY1,KK1；判断KEY1键是否按下 JB KEY1,$；等待KEY1键是否释放,INC R3；模式值增1 ，在0、1、2、3间逐项切换 CJNE R3,#04H,JMPKK3；当让中的模式值为4时，在设置为0 MOV R3,#00HJMPKK3:AJMP KK3；转至KK3，按R3内容选择显示KK1:JNB KEY2,KK2；判断KEY2键是否按下 JB KEY2,$；等待KE

7、Y2键释放MOV A,R3；根据当前R3值对时间项增1调整RL AMOV DPTR,#KJMP1JMP A+DPTRKJMP1: AJMP DISCLK AJMP SINC AJMP MINC AJMP HINC,SINC: MOV A,SECOND；秒增1 ADD A,#01H DA A MOV SECOND,A CJNE A,#60H,DISS1 MOV 30H,#01HDISS1:AJMP DISS；转至秒显示缓冲区设置MINC:MOV A,MINUTE；分增1 ADD A,#01H DA A MOV MINUTE,A CJNE A,#60H,DISM1 MOV MINUTE,#00HD

8、ISM1:AJMP DISM；转至分显示缓冲区设置HINC: MOV A,HOUR；时增1 ADD A,#01H DA A MOV HOUR,A,CJNE A,#24H,DISH1 MOV HOUR,#00HDISH1:AJMP DISH；转至时显示缓冲区设置KK2:JNB KEY3,KK3；判断KEY3是否按下 JB KEY3,$；等待KEY3键释放MOV A,R3RL AMOV DPTR,#KJMP2JMP A+DPTRKJMP2:AJMP DISCLK AJMP SDEC AJMP MDEC AJMP HDECSDEC:MOV A,#9AH；秒减1 CLR C SUBB A,#01H A

9、DD A,SECOND DA A,MOV SECOND,A CJNE A,#00H,DISS2 MOV SECOND,#59HDISS2:AJMP DISS；转至秒显示缓冲区设置MDEC:MOV A,#9AH；分减1 CLR C SUBB A,#01H ADD A,MINUTE DA A MOV MINUTE,A CJNE A,#0,DISM2 MOV MINUTE,#59HDISM2:AJMP DISM；转至分显示缓冲区设置HDEC:MOV A,#9AH；时减1 CLR C SUBB A,#01H ADD A,HOUR DA A,MOV HOUR,A CJNE A,#99H,DISH2 MO

10、V HOUR,#23HDISH2:AJMP DISH；转至时显示缓冲区设置KK3:MOV A,R3 RL AMOV DPTR,#KJMP3 JMP A+DPTRKJMP3:AJMP DISCLK ；R3=0显示时钟 AJMP DISS；R3=1显示秒 AJMP DISM；R3=2显示分 AJMP DISH；R3=3显示时DISCLK:MOV R0,#79H MOV R1,#HOUR MOV R4,#03H,CFLOOP:MOV A,R1 SWAP A ANL A,#0FH MOV R0,A INC R0 MOV A,R1 ANL A,#0FH MOV R0,A INC R0 DEC R1 DJ

11、NZ R4,CFLOOP SETB TR0 RETDISS:CLR TR0；显示秒，时与分的数码管不亮 MOV A,SECOND SWAP A ANL A,#0FH MOV 7DH,A MOV A,SECOND,ANL A,#0FH MOV 7EH,A MOV 79H,#0FH MOV 7AH,#0FH MOV 7BH,#0FH MOV 7CH,#0FH AJMP KK5DISM:CLR TR0；显示分，时与秒的数码管不亮 MOV A,MINUTE SWAP A ANL A,#0FH MOV 7BH,A MOV A,MINUTE ANL A,#0FH MOV 7CH,A MOV 79H,#0F

12、H MOV 7AH,#0FH MOV 7DH,#0FH MOV 7EH,#0FH AJMP KK5,DISH: CLR TR0；显示时，分与秒的数码管不亮 MOV A,HOUR SWAP A ANL A,#0FH MOV 79H,A MOV A,HOUR ANL A,#0FH MOV 7AH,A MOV 7BH,#0FH MOV 7CH,#0FH MOV 7DH,#0FH MOV 7EH,#0FHKK5:RET；定时器T0中断处理子程序TIMER0:PUSH ACC；保护现场 PUSH PSW MOV TH0,#0B1H；重装定时常数 MOV TL0,#0E0H DJNZ R2,NEXT；判断

13、是否中断了50次，不足50次，中断返回MOV R2,#50；若达到50次，计时满1s，刷新时间单元格,MOV A,SECOND ADD A,#01H DA A MOV SECOND,A CJNE A,#60H,NEXTS1:MOV SECOND,#00H MOV A,MINUTEADD A,#01HDA AMOV MINUTE,ACJNE A,#60H,NEXTS2:MOV MINUTE,#00H MOV A,HOUR ADD A,#01H DA A MOV HOUR,A CJNE A,#24H,NEXT MOV HOUR,#00HNEXT:POP PSW；恢复现场 POP ACCRETI；中断返回 END,