精确的单片机常用延时函数：（c代码误差0us 12M）——并未验证
1、延时0.5ms
void delay0.5ms(void)
//误差0us
{
unsigned char a,b;
for(b=71;b>0;b–)
for(a=2;a>0;a–);
}
2、延时1ms void delay1ms(void)
//误差0us
{
unsigned char a,b,c;
for(c=1;c>0;c–)
for(b=142;b>0;b–)
for(a=2;a>0;a–);
}
3、延时2ms
void delay2ms(void)
//误差0us
{
unsigned char a,b;
for(b=4;b>0;b–)
for(a=248;a>0;a–);
_nop_;
//if Keil,require use intrins.h
}
4、延时3ms
void delay3ms(void)
//误差0us
{
unsigned char a,b;
for(b=111;b>0;b–)
for(a=12;a>0;a–);
}
5、延时4ms
void delay4ms(void)
//误差
0us
{
unsigned char a,b,c;
for(c=7;c>0;c–)
for(b=8;b>0;b–)
for(a=34;a>0;a–);
}
6、延时5ms
void delay5ms(void)
//误差0us
{
unsigned char a,b;
for(b=19;b>0;b–)
for(a=130;a>0;a–);
}
7、延时10ms
void delay10ms(void)
//误差0us
{
unsigned char a,b,c;
for(c=1;c>0;c–)
for(b=38;b>0;b–)
for(a=130;a>0;a–);
}
8、延时15ms
void delay15ms(void) //误差0us
{
unsigned char a,b,c;
for(c=1;c>0;c–)
for(b=238;b>0;b–)
for(a=30;a>0;a–);
}
9、延时20ms
void delay20ms(void) //误差0us
{
unsigned char a,b;
for(b=215;b>0;b–)
for(a=45;a>0;a–);
_nop_;
//if Keil,require use intrins.h
_nop_;
//if Keil,require use intrins.h
}
10、延时50ms
void delay50ms(void) //误差0us
{
unsigned char a,b;
for(b=173;b>0;b–)
for(a=143;a>0;a–);
}
11、延时100ms
void delay100ms(void) //误差0us
{
unsigned char a,b,c;
for(c=19;c>0;c–)
for(b=20;b>0;b–)
for(a=130;a>0;a–);
}
12、延时200ms
void delay200ms(void) //误差0us
{
unsigned char a,b,c;
for(c=4;c>0;c–)
for(b=116;b>0;b–)
for(a=214;a>0;a–);
_nop_;
//if Keil,require use intrins.h
}
13、延时500ms
void delay500ms(void) //误差0us
{
unsigned char a,b,c;
for(c=23;c>0;c–)
for(b=152;b>0;b–)
for(a=70;a>0;a–);
}
14、延时1000ms
void delay(void) //误差0us
{
unsigned char a,b,c;
for(c=167;c>0;c–)
for(b=171;b>0;b–)
for(a=16;a>0;a–);
_nop_;
//if Keil,require use intrins.h
}