定时器控制灯泡的亮与灭,亮时蜂鸣器发声
实验晶振11.0592,灯泡亮灭各1s
#include <reg52.h>
#define uchar unsigned char
#define uint unsigned int
uchar num; //全局变量
sbit led = P2^0; //led灯
sbit beep = P1^5; //蜂鸣器
void delay(int i) //延时,用于控制蜂鸣器的音调
{
while(i--);
}
void main()
{
led = 0;
TMOD = 0x01;
TH0 = (65536-45872)/256;
TL0 = (65536-45872)%256;
EA = 1;
ET0 = 1;
TR0 =1;
while(1)
{
if(num == 20)
{
num = 0;
led = ~led;
}
if(led == 0)
{
beep = ~beep;
delay(10);
}
}
}
void TR0_time() interrupt 1 定时器中断程序
{
TH0 = (65536-45872)/256;
TL0 = (65536-45872)%256;
num++;
}