Sorry for my previous reply,

I dont know what state of mind I was in while replying.

Well, I followed your instruction for writing name at 0x30 of DS1307. (First I checked it at 0x10).

Then repeated same for 24c16.

I was able to read/write both addresses in case of DS1307; & none for 24c16

I am really wondering why am I not able to write to 24c16.
I Kept a delay after calling write routines for 24c16 & issuing stop conditions.
for loop of unsigned int as
for(i = 0; i < 0xFFF0; i++);


Regards,
Mahesh Joshi