p3.c

1．基本实验 以扩展实验箱上的74LS273做为输出口

#include <reg51.h>
unsigned char D;
void display(){
	P1=~D;
}
void delay(unsigned int ms){
    unsigned char i;
    unsigned int j;
    for(j=0;j<ms;j++){
        for(i=0;i<60;i++){
            ;
        }
    }
}
main(){
	int i=0;
	D=0x81;
	display();
	delay(3000);
	while(1){		
		D=0x21;
		display();
		delay(10000);
		for(i=0;i<5;i++){
			D=0x41;
			display();
			delay(1000);
			D=0x01;
			display();
			delay(1000);
		}
		D=0x81;
		display();
		delay(500);
		D=0x84;
		display();
		delay(10000);
		for(i=0;i<5;i++){
			D=0x82;
			display();
			delay(1000);
			D=0x80;
			display();
			delay(1000);
		}	
	}
}