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

I have been thinking about this for a week or so and it seems feasible.  I am wonder if code already exists.
 

PortB has a built in comparitor that uses two or three pins [dependent upon internal or external output].

 

Could this be used to measure a low battery voltage? And then, it could issue a message [with the units identify] of the condition via RS-232/rs-485 prior to shuting down.

 

It seems like it would have to be in an Interupt Service Routine.

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