60s.sdi

可实现0到99秒的计时。程序简单易读

,,,ORG 0000H
0000,02 00 30,,LJMP MAIN
,,,ORG 000BH
000B,80 56,,SJMP T0Z
,,,ORG 0030H
0030,,MAIN,MAIN:
0030,90 00 90,,MOV DPTR,#SEG7
0033,7A 3C,,MOV R2,#60
0035,7C 14,,MOV R4,#20
0037,D2 AF,,SETB EA
0039,D2 A9,,SETB ET0
003B,75 89 01,,MOV TMOD,#01H
003E,75 8C 3C,,MOV TH0,#3CH
0041,75 8A B0,,MOV TL0,#0B0H
0044,D2 8C,,SETB TR0
0046,,DISP,DISP:
0046,EA,,MOV A,R2
0047,75 F0 0A,,MOV B,#10
004A,84,,DIV AB
004B,93,,MOVC A,@A+DPTR
004C,F5 A0,,MOV P2,A
004E,D2 B0,,SETB P3.0
0050,12 00 A0,,LCALL DELAY
0053,C2 B0,,CLR P3.0
0055,E5 F0,,MOV A,B
0057,93,,MOVC A,@A+DPTR
0058,F5 A0,,MOV P2,A
005A,D2 B1,,SETB P3.1
005C,12 00 A0,,LCALL DELAY
005F,C2 B1,,CLR P3.1
0061,80 E3,,SJMP DISP
0063,,T0Z,T0Z:
0063,75 8C 3C,,MOV TH0,#3CH
0066,75 8A B0,,MOV TL0,#0B0H
0069,DC 08,,DJNZ R4,T0Z0
006B,7C 14,,MOV R4,#20
006D,DA 05,,DJNZ R2,T0Z1
006F,C2 8C,,CLR TR0
0071,80 01,,SJMP T0Z1
0073,32,T0Z0,T0Z0:RETI
0074,,T0Z1,T0Z1:
0074,EA,,MOV A,R2
0075,75 F0 0A,,MOV B,#10
0078,84,,DIV AB
0079,93,,MOVC A,@A+DPTR
007A,F5 A0,,MOV P2,A
007C,D2 B0,,SETB P3.0
007E,12 00 A0,,LCALL DELAY
0081,C2 B0,,CLR P3.0
0083,E5 F0,,MOV A,B
0085,93,,MOVC A,@A+DPTR
0086,F5 A0,,MOV P2,A
0088,D2 B1,,SETB P3.1
008A,12 00 A0,,LCALL DELAY
008D,C2 B1,,CLR P3.1
008F,32,,RETI
0090,C0 F9 A4 B0,SEG7,SEG7:DB 0C0H,0F9H,0A4H,0B0H
0094,99 92 82 F8,,    DB 99H,92H,82H,0F8H
0098,80 90 88 83,,    DB 80H,90H,88H,83H
009C,C6 A1 86 8E,,    DB 0C6H,0A1H,86H,8EH
00A0,,DELAY,DELAY:
00A0,7F 14,,MOV R7,#20
00A2,7E C8,D1,D1:MOV R6,#200
00A4,DE FE,,DJNZ R6,$
00A6,DF FA,,DJNZ R7,D1
00A8,22,,RET
000E,,,END
,,,