● ● ● ● ● ● ● ● ● ● ● 00H，00H，40H，40H，40H，4FH，70H，00H 数字“8”代码建立如下图所示 1 2 3 4 5 6 7 8 ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● 00H，00H，36H，49H，49H，49H，36H，00H 数字“9”代码建立如下图所示 1 2 3 4 5 6 7 8 ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● ● 00H，00H，32H，49H，49H，49H，3EH，00H 5． 汇编源程序 TIM EQU 30H CNTA EQU 31H CNTB EQU 32H ORG 00H LJMP START ORG 0BH LJMP T0X ORG 30H
START: MOV TIM,#00H MOV CNTA,#00H MOV CNTB,#00H MOV TMOD,#01H
MOV TH0,#(65536-4000)/256 MOV TL0,#(65536-4000) MOD 256 SETB TR0 SETB ET0 SETB EA SJMP $ T0X:
MOV TH0,#(65536-4000)/256 MOV TL0,#(65536-4000) MOD 256 MOV DPTR,#TAB MOV A,CNTA MOVC A,@A+DPTR MOV P3,A
MOV DPTR,#DIGIT
MOV A,CNTB MOV B,#8 MUL AB ADD A,CNTA MOVC A,@A+DPTR MOV P1,A INC CNTA MOV A,CNTA CJNE A,#8,NEXT MOV CNTA,#00H NEXT: INC TIM MOV A,TIM CJNE A,#250,NEX MOV TIM,#00H INC CNTB MOV A,CNTB CJNE A,#10,NEX MOV CNTB,#00H NEX: RETI
TAB: DB 0FEH,0FDH,0FBH,0F7H,0EFH,0DFH,0BFH,07FH DIGIT: DB 00H,00H,3EH,41H,41H,41H,3EH,00H
