#include<reg51.h>void delay(unsigned int z) //声明延时函数sbit beep=P2^7 void main()数{ while(1){ beep=0 //蜂鸣器响 delay(1) //调用1ms延时 beep=1 //蜂鸣器不响 delay(1) //调用1ms延时 }}void delay(unsigned int z)//1ms延时，通过z值改变延时{ unsigned int x for( z>0 z--)

利用ST7定时器输出比较功能定时1ms，定义几个全局变量，做的一个延时比较准确的delay函数，输入1000，就是1000ms-by using ST7 timer OCMP function to define 1ms and created several global variable to get accurate delay function.

用C语言编写，能够实现1秒，1毫秒精确延时(the program can delay 1s or 1ms with C.)

51单片机1ms延时函数，可粗略延时1ms的时间(51 single chip microcomputer 1ms delay function)