@Override
 public Bits8 skip(Bits8 val) throws MVNException {
   for (int i = 0; i < val.toInt(); i++) {
     ler();
   }
   return ler();
 }
 @Override
 public Bits8 ler() throws MVNException {
   v1.add(v0);
   escrever(v1);
   return v1;
 }