unsigned char clock_in(void);
void clock_out(unsigned char dd);
void Init_1302(void);
unsigned char read_clock(unsigned char ord);
void read_clockS(void);
void Set_time(unsigned char sel,bit add_dec);
void write_clock(unsigned char ord, unsigned char dd);
void timeset();
DeToBCD(unsigned char DE);
time_set();
tchange();
void DS1302(void); 
dis1302();