void test_bit()
{
      uint16 target=0;
      DUMP(target);

      // set 2 most significant bits
      
      target |= ((uint16)0x3 << 14);
      // 0x3=0000 0000 0000 0011b right shift by 14 bits becomes 1100 0000 0000 0000b
      // or 0xC000
      DUMP(target);

      // and set the 3 LSBs
      target |= 0x7;
      DUMP(target);

      // if you instead want to unset the 2 least significant bits
      // you can do something like:
      target &= ~0x3;
      // 0x3 is 0000 0000 0000 0011b
      // ~0x3 becomes 1111 1111 1111 1100b
      // bitwise-and this number with target result in the
      // 2 LSB being unset.
      DUMP(target)  
}