fengmingqi.rar_AT89S52蜂鸣器

#include <reg52.h> unsigned char count; sbit P1_3=P1^3; void delay(); void main() { while(1) { for(count=200;count>0;count--) { P1_3=~P1_3; delay(); } for(count=200;count>0;count--) { P1_3=~P1_3; delay(); delay(); } } } void delay() { unsigned char i; for(i=250;i>0;i--); }