[嵌入式]51单片机定时器的应用

控制LED一秒闪烁

#include"reg51.h"
typedef unsigned   int  u16;
typedef unsigned   char   u8;
sbit led1=P2^0;

 sbit led3=P2^2;

sbit led5=P2^4;

 sbit led7=P2^6;
 
void Timer0Init()
{
TMOD|=0X01;
 TH0=0XFC;
 TL0=0X18;
 EA=1;
 TR0=1;
 ET0=1;
}
void main()
{
Timer0Init();
while(1);
}
void Timer0()  interrupt 1
{
 static u16 i;
  TH0=0XFC;
 TL0=0X18;
 i++;
 if(i==1000)
 {
   i=0;
   led1=~led1;
  
   led3=~led3;
  
   led5=~led5;

	led7=~led7;
	
 }
 } 

控制LED和蜂鸣器

#include"reg51.h"
typedef unsigned   int  u16;
typedef unsigned   char   u8;
sbit led1=P2^0;

 sbit led3=P2^2;

sbit led5=P2^4;

 sbit led7=P2^6;
  sbit beep=P1^5;
  void delay(u16 i)
  {
  while(i--);
  }
void Timer0Init()
{
TMOD|=0X01;
 TH0=0XFC;
 TL0=0X18;
 EA=1;
 TR0=1;//溢出中断请求标志位
 ET0=1;//中断允许位
 
}
void main()
{
Timer0Init();
while(1);
}
void Timer0()  interrupt 1
{
 static u16 i;
  TH0=0XFC;
 TL0=0X18;
 i++;
 if(i==1000)
 {
   i=0;
   led1=~led1;
  
   led3=~led3;
  
   led5=~led5;

	led7=~led7;
	beep=~beep;
	delay(10);
 }
 }