LED+定时器

ID:395257 · 发表于 2018-9-8 10:01

#include<reg51.h>
//宏定义
#define uchar unsigned char
#define LED P2

//全局变量
uchar Time;

void main(void)
{
uchar data1=0xfe;
TMOD = 0x01; //选择工作方式1
  TH0 = 0x3C;    //设置初始值,定时50MS
  TL0 = 0xB0;
  EA = 1;    //打开总中断
  ET0 = 1;    //打开定时器0中断
  TR0 = 1;    //启动定时器0
while(1)
{
LED = data1;
if(Time==10) //0.5s进入if内进行移位
{
Time = 0;
data1 = data1<<1|0x01;
if(data1==0xff)data1=0xfe;
}

}
}

void Timer0() interrupt 1
{
   TH0 = 0x3C;    //设置初始值
TL0 = 0xB0;
Time++;
}

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