AT89C51单片机的数字时钟设计教学教材.ppt

;;;;;;;;;2.模式1;3.模式2;4.模式3;; 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,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; MOV 51H,#09H MOV R0,#50H ACALL SEND7219 MOV 50H,#09H ；译码方式寄存器 MOV 51H,#0FFH ；8位显示全部B译码 MOV R0,#50H ACALL SEND7219 RET DISPLAY:MOV 50H,#01H ；显示子程序 MOV 51H,79H ；显示缓冲区设在79H~7EH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 SEND7219 MOV 50H,#02H MOV 51H,7AH ;SEND7219:CLR LOAD ；向7219写入数据子程序 MOV R4,#02H ；写入16位串行数据 CLR C LOP1: MOV R1,#08H MOV A,@R0 LOP2: 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 ;SINC: MOV A,SECOND；秒增1 ADD A,#01H DA A MOV SECOND,A CJNE A,#60H,DISS1 MOV 30H,#01H DISS1: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,#00H DISM1: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 ;MOV SECOND,A CJNE A,#00H,DISS2 MOV SECOND,#59H DISS2: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,#59H DISM2: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 ;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 DJNZ R4,CFLOOP SETB TR0 RET DISS: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;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,#0FH KK5:RET；定时器T0中断处理子程序 TIMER0:PUSH ACC ；保护现场