使用单片机定时器控制交通灯设计

这是我课程设计需要的源代码和原理图，发给大家

单片机源程序如下:

1. #include <reg51.h>
   
2. #define SEG P2
   
3. #define SCANP P1
   
4. #define count_M1 50000
   
5. #define TH_M1 (65535-count_M1)/256;
   
6. #define TL_M1 (65535-count_M1)%256;
   
7. int count_T0=0;
   
8. #define count_M2 250
   
9. #define TH_M2 (256-count_M2)
   
10. #define TL_M2 (256-count_M2)
    
11. 
    
12. char count_T1=0;
    
13. char code TAB[10]={0xc0,0xf9,0xa4,0xb0,0x99,
    
14.                    0x92,0x82,0xf8,0x80,0x98};
    
15. char disp[2]={0x82,0xc0};
    
16. bit red,green,yellow,turnred;  //定义红绿黄灯的标志位
    
17. char scan=0;
    
18. sbit hong=P3^2;
    
19. sbit huang=P3^1;
    
20. sbit lv=P3^0;
    
21. main()
    
22. {
    
23. IE=0x8a;
    
24. TMOD=0x21;
    
25. TH0=TH_M1;TL0=TL_M1;
    
26. TR0=1;
    
27. TH1=TH_M2;TL1=TL_M2;
    
28. TR1=1;
    
29. red=1;
    
30. green=0;
    
31. yellow=0;
    
32. hong=0;
    
33. while(1);
    
34. }
    
35. 
    
36. void delay()
    
37. {
    
38. unsigned char a,b;
    
39. for(a=100;a>0;a--)
    
40. for(b=255;b>0;b--);
    
41. }
    
42. 
    
43. void TO_1s(void)interrupt 1
    
44. {
    
45. static char seconds = 60;
    
46. TH0=TH_M1;TL0=TL_M1;
    
47. if(++count_T0==20)
    
48. {
    
49. count_T0=0;
    
50. seconds--;
    
51. if(seconds==0)
    
52. {if(red==1&green==0&yellow==0)
    
53. {red=0;
    
54. green=1;
    
55. yellow=0;
    
56. hong=1;
    
57. lv=0;
    
58. seconds=30;
    
59. delay();
    
60. }
    
61. else if(red==0&green==1&yellow==0)
    
62. {
    
63. green=0;
    
64. red=0;
    
65. yellow=1;
    
66. lv=1;
    
67. huang=0;
    
68. seconds=3;
    
69. delay();
    
70. }
    
71. else if(red==0&green==0&yellow==1)
    
72. {
    
73. red=1;
    
74. green=0;
    
75. yellow=0;
    
76. hong=0;
    
77. huang=1;
    
78. seconds=60;
    
79. delay();
    
80. }
    
81. }
    
82. disp[1]=TAB[seconds%10];
    
83. disp[0]=TAB[seconds/10];
    
84. }
    
85. }
    
86. 
    
87. void T1_8ms(void)interrupt 3
    
88. {
    
89. if(++count_T1==32)
    
90. {
    
91. count_T1=0;
    
92. if(++scan==3)scan=1;
    
93. SEG=0xff;
    
94. SCANP=~scan;
    
95. SEG=disp[scan-1];
    
96. }
    
97. }
    

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