//time waste function, to wait time given sleeptime[ms]
void sleep(int sleeptime)
{
    int i,j;
    for (i = 0;i < sleeptime; i++)
   {    
       for (j = 0;j < 20000; j++)
   }
}

int main( void) {
  int a,row;
  unsigned char k;
  PB.DDR = 0xff;
  P4.DDR = 0xff;
  while (1){
    a = 0x80;
    for (row = 0;row < 8;row ++){
       P4.DR.BYTE = a;
       PB.DR.BYTE = ~(ascii['A'][row]);
      sleep(1);
      a >>=1;
    }
   return 0;
}