51定时器延时函数（精确延时）

 1 bit f,m;
 2 
 3 void T0_service(void) interrupt 1    
 4 {
 5     TH0=(65536-5000)>>8;
 6     TL0=(unsigned char)(65536-5000);
 7     Count5ms=Count5ms+1;
 8         m=~m;
 9     if (Count5ms==100)    
10     {
11         Count5ms=0;
12         f=~f;
13     }
14 }
15 
16 void delay1s(void)
17 {
18     while(f);
19     while(!f);
20 }
21 
22 void delay10ms(void)
23 {
24     while(m);
25     while(!m);
26 }