标题: ATmega128 time1溢出中断。定时器1在该模式下用法和51的一样 [打印本页]

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作者: liuqq    时间: 2015-5-21 23:45
标题: ATmega128 time1溢出中断。定时器1在该模式下用法和51的一样

1. #include<iom128v.h>
   
2. 
   
3. #define uchar unsigned char
   
4. 
   
5. #define uint unsigned int
   
6. 
   
7. #pragma interrupt_handler timer1:15/*定时器溢出中断向量标号*/
   
8. 
   
9. uchar t=0;
   
10. 
    
11. void timer1()
    
12. 
    
13. {
    
14. 
    
15. TCNT1H=(65536-50000)/256;
    
16. 
    
17. TCNT1L=(65536-50000)%256;
    
18. 
    
19. t++;
    
20. 
    
21. if(t==20)
    
22. 
    
23. {
    
24. 
    
25.   t=0;
    
26. 
    
27.   PORTA=~PORTA;
    
28. 
    
29.   PORTA|=0xfe;
    
30. 
    
31. }
    
32. 
    
33. }
    
34. 
    
35. void IO_init()
    
36. 
    
37. {
    
38. 
    
39. DDRA=0xff;
    
40. 
    
41. PORTA=0xff;
    
42. 
    
43. }
    
44. 
    
45. void T1_init()
    
46. 
    
47. {
    
48. 
    
49. TCNT1H=(65536-50000)/256;//50ms溢出中断
    
50. 
    
51. TCNT1L=(65536-50000)%256;
    
52. 
    
53. TCCR1B=0x02;//8分频，8MHz晶振，1us
    
54. 
    
55. TIMSK=0x04;
    
56. 
    
57. SREG=0x80;
    
58. 
    
59. }
    
60. 
    
61. main()
    
62. 
    
63. {
    
64. 
    
65. IO_init();
    
66. 
    
67. T1_init();
    
68. 
    
69. while(1)
    
70. 
    
71. {
    
72. 
    
73.   ;
    
74. 
    
75. }
    
76. 
    
77. }

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