Question

用C51单片机设计一个指示灯闪烁程序，要求：亮1秒钟，灭2秒钟

用定时器实现

Answer 1

#include <reg51.h>
sbit led=P1^0;
unsigned char a;
void init()
{
TMOD=0x01;
TH0=(65536-50000)/256;
TL0=(65536-50000)%256;
EA=1;
ET0=1;
TR0=1;
}
void main()
{
init();
while(1)
{
if(a==60)
{
a=0;
if(a<=20)
led=0; //LED亮
else
led=1; //LED灭
}
}
}
void timer0() interrupt 1
{
TH0=(65536-50000)/256;
TL0=(65536-50000)%256;
a++;
}

追问

好像跟我们老师的有点不同呢

Answer 2

#include<reg51.h>
#define uchar unsigned char

char cnt;
sbit LAMP=P1^1;

void initial(void)
{
TMOD=0X01;
TH0=-(50000/256);
TL0=-(50000%256);
ET0=1;
TR0=1;
EA=1;
}

void time0(void) interrupt 1
{
TH0=-(50000/256);
TL0=-(50000%256);
cnt++;
if(cnt<=20)LAMP=0;
else LAMP=1;
if(cnt>=60)cnt=0;
}

void main(void)
{
initial();
while(1){
}

}

Answer 3

给邮箱我给你做，汇编的！

追问

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