DS1307 RTC Ram

Forum 2005-2010 (read only) Hardware Interfacing
#1

Hello,

I was looking through the datasheet of the DS1307 RTC and I saw that it contains 56 bytes of ram. I need to know how to access the ram, how can I do this?

#2

Use this library:
http://code.google.com/p/libds1307/

#3

Here's a good spot that shows how to access the RTC functions http://www.glacialwanderer.com/hobbyrobotics/?p=12#comment-3723

I think you just have to set the register pointer past the time/date data. Maybe 0x08? as 0-7 are the time/date bytes, but don't quote me on that. I'm just pulling that from the code on the other pages

#4

I dont think the library has a function for ram, Jerry i dont see anything about the ram...

#5

you could use :-

void WriteRam(int address,byte data){
   Wire.beginTransmission(0x68);              // Select DS1307
  Wire.send(address+8);                       // address location starts at 8, 0-6 are date, 7 is control
  Wire.send(data);                            // send data
  Wire.endTransmission();
}

where address is 0-55

#6

Thanks Squiggler!

#7