1. #include "reg52.h"
    2. #include "intrins.h"
    4. sbit LED1 = P1^1; // LED灯
    5. sbit SLED1 = P2^4; // 数码管
    6. sbit SLED2 = P2^5;
    7. sbit SLED3 = P2^6;
    8. sbit SLED4 = P2^7;
    10. unsigned char counter;
    11. unsigned char time_counter;
    13. // 数码管显示的数字
    14. typedef unsigned char uchar;
    15. uchar code dataArr[] = {0x3f, 0x06, 0x5b, 0x4f, 0x66, 0x6d, 0x7d, 0x07, 0x7f, 0x6f};
    17. // ms级延时函数
    18. void delay(unsigned int xms)
    19. {
    20.     unsigned int i,j;
    21.     for(i = xms; i > 0; i--)
    22.         for(j = 114; j > 0; j--);
    23. }
    25. // 数码管计时
    26. void display(unsigned char time_counter)
    27. {
    28.     unsigned char shi, ge;
    29.     shi = time_counter / 10;
    30.     ge = time_counter % 10;
    32.     // 只让数码管1亮
    33.     SLED1 = 1;
    34.     SLED2 = 0;
    35.     SLED3 = 0;
    36.     SLED4 = 0;
    37.     P0 = dataArr[shi]; // 十位
    38.     delay(2);
    40.     // 只让数码管2亮
    41.     SLED1 = 0;
    42.     SLED2 = 1;
    43.     SLED3 = 0;
    44.     SLED4 = 0;
    45.     P0 = dataArr[ge]; // 个位
    46.     delay(2);
    47. }
    49. void main()
    50. {
    51.     // 定时器
    52.     /* 定时50ms
    53.     11.0592晶振的机器周期为 1/11.0592 * 12 = 1.085ns
    54.     50000/1.085 = 46082
    55.     65536-46082 = 19454 = 4bfe
    56.     */
    57.     TMOD = 0x01; // 选择定时器模式1 定时器0
    58.     TH0 = (65536 - 46082)/256; // 定时50ms
    59.     TL0 = (65536 - 46082)%256; 
    60.     TR0 = 1; // 启动定时器0
    62.     LED1 = 0;
    64.     while(1)
    65.     {
    66.         if(TF0 == 1)
    67.         {
    68.             TF0 = 0;
    69.             TH0 = 0x4b;
    70.             TL0 = 0xfe;
    72.             counter++;
    73.         }
    75.         if(counter == 20)
    76.         {
    77.             LED1 = ~LED1;
    78.             counter = 0;
    79.             time_counter++;
    80.         }
    82.         if(time_counter == 60)
    83.         {
    84.             time_counter = 0; // 到60s计时器清零
    85.         }
    87.         display(time_counter);
    88.     }
    89. }