【導讀】軟件延時控制A﹑C路口紅燈，B﹑D路口綠燈亮60秒；然后A﹑C路口綠燈閃5下，再黃燈亮，B﹑D不變。并將綠燈剩余時間顯示在LED上。而后，對六車道以上道路的“十字交叉路口交通燈控制”進行了。希望能給有關政府部門一些?，F(xiàn)今的交通發(fā)展迅速，車輛極具增加，馬路。行人自控指示燈系統(tǒng)可以有效的改善這種狀況。的大都市，經(jīng)濟飛速發(fā)展，車輛繁多，人口密集。緩解交通已成為當務之急.例。時間,即保證行人過馬路時的安全，也減輕了交管部門的負擔。主控單片機采用一片80c51。利用單片機產(chǎn)生的時鐘信號控制交通信號燈達到控制路口通。80c51提供以下標準功能：8K字節(jié)Flash閃速存儲器，256字節(jié)內(nèi)部RAM，同時，80c51可降至0Hz的靜態(tài)邏輯操作，定時/計數(shù)器，串行通信口及中斷系統(tǒng)繼續(xù)工作，掉電方式保存RAM中的內(nèi)容，但振蕩器停止工作并禁止其它所有部件工作直到下一個硬件復位。LED顯示器件是通過發(fā)光二極管顯示字段的器件。此方案是通過并行接口芯片80c51和計算

　　

【正文】 IE,87H MOV TMOD,01H MOV TH0,3CH MOV TL0,0B0H MOV R7,20 SETB TR0 HHF0:MOV 26H,20H MOV 2BH,25H MOV P1,9EH HHF1:ACALL DISP1 MOV A,2BH CJNE A,0,HHF1 MOV 2AH,24H 第 24 頁 MOV P1,0AEH HHF2:ACALL DISP2 MOV A,2AH CJNE A,0,HHF2 MOV 28H,22H MOV 29H,23H MOV P1,0B3H HHF3:ACALL DISP3 MOV A,28H CJNE A,0,HHF3 MOV 27H,21H MOV P1,0B5H HHF4:ACALL DISP4 MOV A,27H CJNE A,0,HHF4 LJMP HHF0 DISP1:MOV A,2BH MOV B,10 DIV AB MOV 30H,B MOV 31H,A MOV A,26H MOV B,10 DIV AB MOV 32H,B MOV 33H,A ACALL DISP RET DISP2:MOV A,2AH MOV B,10 DIV AB MOV 30H,B MOV 31H,A MOV A,26H MOV B,10 DIV AB MOV 32H,B MOV 33H,A ACALL DISP RET DISP3:MOV A,29H MOV B,10 DIV AB MOV 30H,B MOV 31H,A MOV A,28H MOV B,10 DIV AB MOV 32H,B MOV 33H,A ACALL DISP RET DISP4:MOV A,29H MOV B,10 第 25 頁 DIV AB MOV 30H,B MOV 31H,A MOV A,27H MOV B,10 DIV AB MOV 32H,B MOV 33H,A ACALL DISP RET DISP5:MOV 2BH,21H MOV 26H,20H ACALL DISP1 RET DISP6:MOV 2AH,24H MOV 26H,23H ACALL DISP2 RET DISP:MOV R2,4 MOV R0,30H MOV R3,08H HHF5:MOV A,R3 MOV P2,A MOV DPTR,TABLE MOV A,@R0 MOVC A,@A+DPTR MOV P0,A ACALL DELAY MOV A,R3 RR A MOV R3,A INC R0 DJNZ R2,HHF5 RET TABLE:DB 3FH,06H,5BH,4FH,66H DB 6DH,7DH,07H,7FH,6FH DELAY:MOV R4,2FH HHF32:MOV R5,0AH HHF6:DJNZ R5,HHF6 DJNZ R4,HHF32 RET TIME1:PUSH ACC PUSH PSW INC 2DH INC 2EH HHF33:JB ,HHF15 HHF16:JNB ,HHF16 INC 2DH HHF15:JB ,HHF17 HHF18:JNB ,HHF18 INC 2EH HHF17:MOV A,2DH 第 26 頁 CJNE A,1,HHF19 HHF23:ACALL DISP5 JB ,HHF20 HHF21:JNB ,HHF21 MOV A,2EH CJNE A,1,HHF22 INC 20H SJMP HHF23 HHF22:MOV 2EH,00H INC 21H SJMP HHF23 HHF20:JB ,HHF24 HHF25:JNB ,HHF25 MOV A,2EH CJNE A,1,HHF26 DEC 20H SJMP HHF23 HHF26:MOV 2EH,00H DEC 21H SJMP HHF23 HHF19:MOV 2DH,00H ACALL DISP6 JB ,HHF27 HHF28:JNB ,HHF28 MOV A,2EH CJNE A,1,HHF29 INC 23H SJMP HHF19 HHF29:MOV 2EH,00H INC 24H SJMP HHF19 HHF27:JB ,HHF24 HHF30:JNB ,HHF30 MOV A,2EH CJNE A,1,HHF31 DEC 23H SJMP HHF19 HHF31:MOV 2EH,00H DEC 24H SJMP HHF19 HHF24:JB ,HHF33 HHF34:JNB ,HHF34 CLR C MOV A,20H SUBB A,24H MOV 25H,A CLR C MOV A,23H SUBB A,21H MOV 22H,A MOV 26H,20H MOV 27H,21H MOV 28H,22H 第 27 頁 MOV 29H,23H MOV 2AH,24H MOV 2BH,25H MOV 2DH,00H MOV 2EH,00H POP PSW POP ACC RETI TIME2:PUSH ACC PUSH PSW MOV TH0,3CH MOV TL0,0B0H DJNZ R7,HHF7 MOV R7,20 DEC 26H DEC 27H DEC 28H DEC 29H DEC 2AH DEC 2BH HHF7:POP PSW POP ACC RETI TSH:PUSH ACC PUSH PSW MOV P2,00H HHF14:INC 2CH MOV A,2CH CJNE A,1,HHF8 MOV P1,0B3H SJMP HHF11 HHF8:CJNE A,2,HHF9 MOV P1,0B6H SJMP HHF11 HHF9:CJNE A,3,HHF10 MOV P1,9BH HHF10:MOV 2CH,00H HHF11:JNB ,HHF13 SJMP HHF12 HHF13:JB ,HHF14 SJMP HHF13 HHF12:JB ,HHF11 HHF35:JNB ,HHF35 MOV 2CH,00H POP PSW POP ACC RETI END 第 28 頁