ex4-2.c

20多个proteus仿真的例子

#include <reg51.h>
#include <stdio.h>

#define DELAYTIME   65000 //定义延迟时间常数
unsigned int temp1;

void delay(unsigned int temp)//延时程序
{
  while(--temp);
}

void main()
{

        P2=255;//led is off
        while(1)
		{
            P2=0Xc0;//显示0,P2口输出其段选码
			temp1=DELAYTIME;
			delay(temp1);

			P2=0XF9;//显示1,P2口输出其段选码
			temp1=DELAYTIME;
			delay(temp1);

			P2=0XA4;//显示2,P2口输出其段选码
			temp1=DELAYTIME;
			delay(temp1);

			P2=0XB0;//显示3,P2口输出其段选码
			temp1=DELAYTIME;
			delay(temp1);

			P2=0X99;//显示4,P2口输出其段选码
			temp1=DELAYTIME;
			delay(temp1);

			P2=0X92;//显示5,P2口输出其段选码
			temp1=DELAYTIME;
			delay(temp1);

			P2=0X82;//显示6,P2口输出其段选码
			temp1=DELAYTIME;
			delay(temp1);

			P2=0Xf8;//显示7,P2口输出其段选码
			temp1=DELAYTIME;
			delay(temp1);

			P2=0X80;//显示8,P2口输出其段选码
			temp1=DELAYTIME;
			delay(temp1);

			P2=0X90;//显示9,P2口输出其段选码
			temp1=DELAYTIME;
			delay(temp1);

			P2=0X08;//显示A,P2口输出其段选码
			temp1=DELAYTIME;
			delay(temp1);

			P2=0X03;//显示B,P2口输出其段选码
			temp1=DELAYTIME;
			delay(temp1);

			P2=0X46;//显示C,P2口输出其段选码
			temp1=DELAYTIME;
			delay(temp1);

			P2=0X21;//显示D,P2口输出其段选码
			temp1=DELAYTIME;
			delay(temp1);

			P2=0X06;//显示E,P2口输出其段选码
			temp1=DELAYTIME;
			delay(temp1);

			P2=0X0E;//显示F,P2口输出其段选码
			temp1=DELAYTIME;
			delay(temp1);
			temp1=DELAYTIME;
			delay(temp1);

		
		}
}