typedef struct
{
  unsigned char  d01 : 2;
  unsigned char  d02 : 2;
  unsigned char  d03 : 2;
  unsigned short d04 : 2;   //违背1
} stData1;

typedef struct
{
  unsigned short d01 : 2;
  unsigned short d02 : 2;
  unsigned short d03 : 2;
  unsigned short d04 : 12;  //违背2
  unsigned short d05 : 2;
  unsigned short d06 : 2;
  unsigned short d07 : 2;
  unsigned short d08 : 8;
} stData2;

int main ( void )
{
  stData1 my_data1;
  stData2 my_data2;

  return ( 0 );
}