// Structure for the first 8 registers.
// These 8 bytes can be read at once with 
// the 'clock burst' command.
// Note that this structure contains an anonymous union.
// It might cause a problem on other compilers.
typedef struct ds1302_struct
{
  uint8_t Seconds:4;      // low decimal digit 0-9
  uint8_t Seconds10:3;    // high decimal digit 0-5
  uint8_t CH:1;           // CH = Clock Halt
  uint8_t Minutes:4;
  uint8_t Minutes10:3;
  uint8_t reserved1:1;
  union
  {
    struct
    {
      uint8_t Hour:4;
      uint8_t Hour10:2;
      uint8_t reserved2:1;
      uint8_t hour_12_24:1; // 0 for 24 hour format
    } h24;
    struct
    {
      uint8_t Hour:4;
      uint8_t Hour10:1;
      uint8_t AM_PM:1;      // 0 for AM, 1 for PM
      uint8_t reserved2:1;
      uint8_t hour_12_24:1; // 1 for 12 hour format
    } h12;
  };
  uint8_t Date:4;           // Day of month, 1 = first day
  uint8_t Date10:2;
  uint8_t reserved3:2;
  uint8_t Month:4;          // Month, 1 = January
  uint8_t Month10:1;
  uint8_t reserved4:3;
  uint8_t Day:3;            // Day of week, 1 = first day (any day)
  uint8_t reserved5:5;
  uint8_t Year:4;           // Year, 0 = year 2000
  uint8_t Year10:4;
  uint8_t reserved6:7;
  uint8_t WP:1;             // WP = Write Protect
};