In SX Microcontrollers, SX/B Compiler and SX-Key Tool, johncouture wrote:

If you only need a couple of bytes of memory and your project has an Real Time Clock like DS1307 or PCF8583, they too have some memory in there you can address (56 in the first and a little over 200 in the latter).  Again, though, you will have to learn the I2C protocol. 

Pick up a Professional Dev Board and practice on the DS1307 (that's what I have been doing this weekend for a class lesson plan).  Code is in another thread just posted under the heading "DS1307 code"

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