void main()
{
   int i = 0;
   P0 = 0x00;
   P1 = 0x00;
   <b>P2 = 0x00;</b>
   P3 = 0x00;

for(i = 0; i < 200; i++){ 
P2_6 = 0x80; 
nothing(); 
<b>P2_6 = 0x00;</b>
nothing(); 
}