Question

P0 = ~0x80; P2 = 0x7F; Delay(200); P2 = 0xDF; Delay(200); P2 = 0xF7; Delay(200); P2 = 0xFD;

Answer 1

#includereg51.h>
void delay()
{
unsigned char i,j,k;
for(i=1;i>0;i--)
for(j=200;j>0;j--)
for(k=248;k>0;k--);
}
void main()
{
while(1)
{
P2=0xfe;
delay();

P2=0xfe;
delay();

P2=0xfd;
delay();

P2=0xfb;
delay();

P2=0xf7;
delay();

P2=0xef;
delay();

P2=0xdf;
delay();

P2=0xbf;
delay();

P2=0x7f;
delay();
}
}