Question

试用mcs-51单片机p1.0口设计一个led闪烁发光电路

请画出电路图，用汇编语言写出点亮子程序，谢谢

Answer 1

#include <reg51.h>

sbit key = P1^4;
bit key_on = 0;

#define led P2
void delay(void);

main()
{
unsigned char i=0;

while(1)
{
if(key == 0)
{
if(key_on==0)
{
i=(i+1)%8;
key_on=1;
}
}
switch(i)
{
case 0:led=0xfe;break; //点亮led0
case 1:led=0xfd;break; //点亮led1
case 2:led=0xfb;break; //点亮led2
case 3:led=0xf7;break; //点亮led3
case 4:led=0xef;break; //点亮led4
case 5:led=0xdf;break; //点亮led5
case 6:led=0xbf;break; //点亮led6
case 7:led=0x7f;break; //点亮led7
}
while(key_on)
{
if(key==1)
{
key_on=0;
}
}

//delay();
}
}
void delay(void)
{
unsigned int i;
for(i=0;i<60000;i++)
{}
}