51单片机定时器简单示例

第一次写博客这玩意，不太会，算了，直接粘代码吧。
 1 #include <reg52.h>
 2 #include <intrins.h> //头文件，将会用到循环右移
 3 //宏定义
 4 #define uchar unsigned char
 5 #define uint  unsigned int
 6 //位、变量声明
 7 sbit led1 = P1^0;
 8 sbit dula = P2^6;
 9 sbit wela = P2^7;
10 uchar counter_ms, counter_s, led_flow = 0xfe;
11 uchar code digitron_data[] = { 0x3f, 0x06, 0x5b, 0x4f, 0x66, 0x6d, 0x7d, 0x07, 0x7f, 0x6f };
12 //延时函数
13 void delay(uint z)
14 {
15     uint x, y;
16     for (x = 0; x < z; x++)
17         for (y = 0; y < 114; y++);
18 }
19 //流水灯函数    
20 void display_led ()
21 {
22     while(1) {
23             led_flow = _cror_(led_flow, 1);
24             P1 = led_flow;
25             delay(500);//调用延时函数
26     }
27 }
28 //数码管函数
29 void display_digitron(uchar i)
30 {
31     uchar tens, ones;
32     tens = i / 10;//求模得到十位
33     ones = i % 10;//求余得到个位
34     
35     P0   = 0xff;//使所有数码管熄灭
36     wela = 1;
37     P0   = 0xfe;
38     wela = 0;
39     
40     dula = 1;
41     P0   = digitron_data[tens];
42     dula = 0;
43     delay(1);
44     
45     P0   = 0xff;
46     wela = 1;
47     P0   = 0xfd;
48     wela = 0;
49     
50     dula = 1;
51     P0   = digitron_data[ones];
52     dula = 0;
53     delay(1);
54 }
55 //定时器初始化函数
56 void timer_init()
57 {
58     TMOD = 0x10;//TMOD的地址是0x89,不能被8整除，只能对字节操作，不能位操作
59     TH1  = 0x4c;
60     TL1  = 0x00;
61     TR1  = 1;    //TCON的地址是0x88,可以对位操作
62 }
63 //主函数main
64 void main()
65 {
66     timer_init();//调用定时器初始化函数
67     while(1) {
68         if (TF1 == 1) {
69             TF1 = 0;
70             TH1 = 0x4c;
71         TL1 = 0x00;
72             counter_ms++;    
73         }
74         if (counter_ms == 20) {//counter_ms累加20次是1秒
75             counter_ms = 0;
76             counter_s++;
77         }
78         if (counter_s ==60) {//counter_s累加60次是1分钟
79             wela = 1;
80             P0   = 0xff;
81             wela = 0;
82             TR1 = 0;
83             display_led();//调用流水灯函数    
84         /*
85         led_flow = _cror_(led_flow, 1);
86             P1       = led_flow;
87             delay(500);
88         */
89         } else {
90         display_digitron(counter_s);//调用数码管函数
91         }
92     }
93 }