delay.h

51单片机程序

//延时程序
#define XTAL 1
#define uchar unsigned char 
#define uint unsigned int  
void delay_1us()
{
//asm("nop");
}
void delay_nus( unsigned int n)
{
unsigned int i=0;
for(i=0;i<n;i++)
delay_1us();
}
void delay_1ms()
{
unsigned int i;
for(i=0;i<(unsigned int)(XTAL*143-2);i++);
}
extern void delay_nms(unsigned int n)
{
unsigned int i=0;
for(i=0;i<n;i++)
{
delay_1ms();
}
}