"It is possible to get an interrupt per second from RTC ? "
Yes it is and much of what you need to know I have done here >> http://www.mcselec.com/index.php?option=com_content&task=view&id=318&Itemid=57
The RTC does exactly this in the clock even though its not the same one its very similar. Why not use my infrared remote control software to have an easy way to input your settings all you need is an infrared remote and a receiver chip les than US $4 see the blog section for the info 32 x 8 matrix display there you will also see the low cost remote and receiver listed. Since you are having a bit of a struggle with this and I am also going to build the same sort of device I will start another blog and begin with what you need (and I do) the RTC code. I do my best to put lots of comments in my code so that others can learn from it as well as I will know how I did later when I forget! So watch the blog section and I will start to put together the next part of my automation using code parts from the other blogs which are all going to work together.
Regards Paul
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