1.功能描述

AT89c51板子

2.程序

#include <REGX51.H>

#define uchar unsigned char

#define uint unsigned int

void delay(uint ms);

void main(void)

{

int l=0;

while(1)

{

for(l=0;l<20;l++)

{

P1=0xfe;

delay(250);

P1=0xfc;

delay(250);

P1=0xf8;

delay(250);

P1=0xf0;

delay(250);

}

for(l=0;l<15;l++)

{

P1=0xe0;

delay(250);

P1=0x80;

delay(250);

P1=0x70;

delay(250);

P1=0x60;

delay(250);

P1=0x50;

delay(250);

}

}

}

void delay(uint ms)

{

uchar i;

uint j;

for(j=0;j<ms;j++)

for(i=0;i<125;i++)

;

}

3.原理圖