定时器85531.doc

2009-10-02 by yingang2009*/#include/*#define Byte unsigned char#define Word unsigned int#define DWord unsigned long/*#define Speed 12 /12 MHz(注意更高就不能一次得到50ms定时了)#define TTTT 50000 /50ms#define TH1_Init_Val (65536-Speed * TTTT / 12)/256#define TL1_Init_Val (65536-Speed * TTTT / 12)%256sbit L1 = P10 ;sbit L2 = P11 ;sbit L3 = P12 ;sbit L4 = P13 ;sbit L5 = P14 ;sbit L6 = P15 ;sbit L7 = P16 ;sbit L8 = P17 ;/*模块变量bit flag1s ;/*T1初始化void T1_Init() TMOD= 0x11; TH1=TH1_Init_Val ; TL1=TL1_Init_Val ; ET1 =1; EA =1; TR1 =1;/*LED主进程第一秒钟L1,L3亮，第二秒钟L2,L4亮，第三秒钟L5,L7亮，第四秒钟L6,L8亮，第六秒钟L2,L4,L6，L8亮，第七秒钟八个二极管全亮，第八秒钟全灭可以将P0口各时刻的状态做个表格,这里就不做了*/void Led_Run() static Byte step; if (!flag1s)return; /接收定时器“flag1s”消息,没到1s返回 flag1s = 0; /1s到则开始工作 step+; switch(step) /以1s为间隔进行顺序控制 case 1: P1 =0xff; /先熄灭 L1 = 0; L3 = 0; break; case 2: P1 =0xff; /先熄灭 L2 = 0; L4 = 0; break; case 3: P1 =0xff; /先熄灭 L5 = 0; L7 = 0; break; case 4: P1 =0xff; /先熄灭 L6 = 0; L8 = 0; break; case 5: /do nothing 维持第4秒内容 break; case 6: P1 =0xff; /先熄灭 L2 = 0; L4 = 0; L6 = 0; L8 = 0; break; case 7: P1 = 0x00; /全亮 break; case 8: P1 =0xff; /全灭 step = 0; /步骤复位 break; default: step = 0; /具有一定的抗干扰意义 break; /*主程序void main() T1_Init(); while(1) Led_Run(); void ISR_T1() interrupt 3 using 2 /定时器1中断服务程序50ms static Byte cnt1s; TH1=TH1_Init_Val ; TL1