1.c

C51 程序练习

//利用定时/计数器T0从P1.0输出周期为1s的方波，
//让发光二极管以1HZ闪烁，设晶振频率为12MHz
#include<reg52.h>
#define uchar unsigned char;
#define uint unsigned int;
sbit D=P1^0;
uchar a;

void main()
{
	a=0;
	TMOD=0x01;
	TH0=(65536-50000)/256;
	TL0=(65536-50000)%256;
	EA=1;
	ET0=1;
	TR0=1;
	while(1);
	
}

void exter0() interrupt 1
{
	TH0=(65536-50000)/256;
	TL0=(65536-50000)%256;
	a++;
	if(a==20)
	{
		a=0;
		D=~D;
	}
}