In SX Microcontrollers, SX/B Compiler and SX-Key Tool, RDL2004 wrote:

The functioning of the back up battery should be automatic when Vcc2 drops below Vcc1. You do not need any code. I think trickle charging is an unnecessary complication in this case. If you have any code pertaining to the trickle charging, I would try again with that code removed. Be sure to use a fresh battery and observe correct polarity. Make certain the + side of the battery is connected only to Vcc1 so that it is not accidentally drained by other circuitry.


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