ex40.c

单片机C语言应用100例.rar

#include<AT89X51.h>
#include<ctype.h>
void main(void) 
{
	P3_0=0;  //将P3.0引脚置低电平，LED点亮
	P3_1=0;  //将P3.0引脚置低电平，LED点亮
	P3_2=0;  //将P3.0引脚置低电平，LED点亮
	P3_3=0;  //将P3.0引脚置低电平，LED点亮
	P3_4=1;  //将P3.4引脚置高电平，LED熄灭
	P3_5=1;  //将P3.5引脚置高电平，LED熄灭
	P3_6=1;  //将P3.7引脚置高电平，LED熄灭
	P3_7=1;  //将P3.7引脚置高电平，LED熄灭
	while(1)
	  ;
}