Many questions arise...
If the address is fixed as 0x68 then how we can say that we can attach as many number of devices on I2C bus... we want till the addresses are available...
Hence, the conclusion comes to be that we can interface only one DS1307... which is contradictory...
Secondly,
1101000 signifies 0x68 ... sure...
and is there any baud rate followed to transfer the data...
PS: I know i am putting more stress on forum... which i should not do... but i am sorry for that...