【正文】 INC R2 CJNE R2,0AH,DISPLY3 MOV R2,00H MOV P2,0C0H INC R3 CJNE R3,0AH,DISPLY4 SJMP STARTDISPLY4:MOV A,R3 ADD A,1EH MOVC A,A+PC MOV P0,A SJMP DISPLYDISPLY3:MOV A,R2 ADD A,16H MOVC A,A+PC MOV P2,A SJMP DISPLYDISPLY2:MOV A,R1 ADD A,0EH MOVC A,A+PC MOV P3,A SJMP DISPLY DISPLY1:MOV A,R0 ADD A,06H MOVC A,A+PC MOV P1,A ACALL DELAY SJMP DISPLYDTAB:DB 0C0H,0F9H,0A4H,0B0H,99H,92H,82H,0F8H,80H,90HDB 88H,83H,0C6H,0A1H,86H,8EH,0FFH,0CH,89H,7FH,0BFH DELAY: MOV R7,0AHDELAY1:MOV R6,0FFHDELAY2:MOV R5,03H DELAY3:DJNZ R5,DELAY3 DJNZ R6,DELAY2 DJNZ R7,DELAY1 RET END74HC595四位穩(wěn)定顯示：1）最大數(shù)為9999的計數(shù)器 ORG 0000H AJMP MAIN ORG 000BH AJMP CRT0 ORG 0020HMAIN:MOV R1,33H MOV R2,04HCLEAR:MOV R1,33H DEC R1 DJNZ R2,CLEAR MOV SP,60H MOV TMOD,01H MOV TH0,3CH MOV TL0,0B0H SETB EA SETB ET0SETB TR0 MOV R7,1 MOV DPTR,DTABLOOP: MOV R1,33H MOV R2,04H MOV R3,08H MOV R4,01HLOOP1:MOV A,R3 MOV P2,A RR A MOV R3,A MOV A,R1 CJNE R4,00H,MODEXSH: LCALL DIS LCALL DELDEC R1DJNZ R2,LOOP1 AJMP LOOPMODE: CJNE A,00H,FH MOV R4,01H MOV A,0AH SJMP XSHFH: MOV R4,00H SJMP XSHCRT0: DJNZ R7,RRR MOV R7,1 INC 30H MOV R0,30H CJNE R0,0AH,RRR MOV 30H,00H INC 31H MOV R0,31H CJNE R0,0AH,RRR MOV 31H,00H INC 32H MOV R0,32H CJNE R0,0AH,RRR MOV 32H,00H INC 33H MOV R0,33H CJNE R0,0AH,RRR MOV 33H,00HRRR: MOV TH0,3CH MOV TL0,0B0H RETIDIS: MOVC A,A+DPTR MOV P0,A RETDEL: MOV R6,20DEL1: MOV R5,150DEL2: DJNZ R5,$ DJNZ R6,DEL1 RETDTAB:DB 0C0H,0F9H,0A4H,0B0H,99H,92H,82H,0F8H,80H,90H,0FFHDB 88H,83H,0C6H,0A1H,86H,8EH,0FFH,0CH,89H,7FH,0BFH END2）最高位為零時，最高位不顯示 ORG 0000H AJMP MAIN ORG 000BH AJMP CRT0 ORG 0020HMAIN: MOV R1,33H MOV R2,04HCLEAR: MOV R1,00H DEC R1 DJNZ R2,CLEAR MOV SP,60H MOV TMOD,01H MOV TH0,3CH MOV TL0,0B0H SETB EA SETB ET0 SETB TR0 MOV R7,1 MOV DPTR,DTABLOOP: MOV R1,33H MOV R2,04H MOV R3,08HLOOP1: MOV A,R3 MOV P2,A RR A MOV R3,A MOV A,R1 LCALL DIS LCALL DEL DEC R1 DJNZ R2,LOOP1 AJMP LOOPCRT0: DJNZ R7, RRR MOV R7,1 MOV R0,30H MOV R4,04HCON: INC R0 CJNE R0,0AH,RRR MOV R0,00H INC R0 DJNZ R4,CONRRR: MOV TH0,3CH MOV TL0,0B0H RETIDIS: MOVC A,A+DPTR MOV P0,A RETDEL: MOV R6,20DEL1: MOV R5,150DEL2: DJNZ R5,$ DJNZ R6,DEL1 RETDTAB:DB 0C0H,0F9H,0A4H,0B0H,99H,92H,82H,0F8H,80H,90H,0FFHDB 88H,83H,0C6H,0A1H,86H,8EH,0FFH,0CH,89H,7FH,0BFH END3）最大數(shù)為256的計數(shù)器 DAT DATA 30H BW DATA 31H SHW DATA 32H GW DATA 33H ORG 0000H AJMP MAIN ORG 000BH AJMP COUNT ORG 0030HMAIN: MOV SP,60H MOV TMOD,01H MOV TH0,3CH MOV TL0,0B0H SETB EA SETB ET0 SETB TR0 MOV R7,2 MOV DAT,00HLOOP: LCALL CHANGE MOV P2,01H MOV A,GW LCALL DIS LCALL DEL MOV P2,02H MOV A,SHW LCALL DIS LCALL DEL MOV P2,04H MOV A,BW LCALL DIS LCALL DEL MOV P2,08H MOV A ,0AH LCALL DIS LCALL DEL AJM