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

Many Real Time Clocks have RAM that can be accessed.  To keep accurate time and maintain the memory you can connect the RTC to a coin battery (or my favorite a 9vdc batt and a 1M ohm resistor).  You communicate with the RTC / RAM using the SX's built in I2C commands.

There are a plethora of EEPROM devices that also communicate via I2C protocol and you are mainly limited by your pocketbook.

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