#include <P18F458.h>
void main(void)
  { 
    unsigned char mydata[100];	
    unsigned char x, z = 0xFF;
    TRISB = 0;				
    for(x=0;x<100;x++)
      {
        mydata[x] = z;			
        PORTB = z;   			
        z--;    				
      }
  }