單片機(jī)LED燈計(jì)數(shù)

電路圖：

代碼如下：

#include

sbit P1_7 = P1 ^ 7;

sbit P1_6 = P1 ^ 6;

sbit P1_5 = P1 ^ 5;

sbit P1_4 = P1 ^ 4;

void delay(unsigned char i) {

unsigned int j = 0,k = 0;

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

for(j = 0; j < 255; j++);

}

void main(void) {

char i = 0;

while (1) {

P1_7 = 0;

delay(200);

P1_6 = 0;

delay(200);

P1_5 = 0;

delay(200);

P1_4 = 0;

delay(200);

P1_7 = 1;

delay(200);

P1_6 = 1;

delay(200);

P1_5 = 1;

delay(200);

P1_4 = 1;

delay(200);

}

}