PCF8523, have source code?
Unfortunately we don't have source code but we have manual UM10301 for reference for hardware and software design.
There is, indeed no source code available from NXP. The data sheet is detailed enough to create a driver from scratch for the majority of the functionality.
There are several source code repositories that provide code for the PCF8523.
Here below are some examples:
The Arduino library for PCF8523 is explained at
All the examples above implement a subset of the functionality provided by the NXP chip PCF8523.
We are searching for some examples of the use of the TIMER B and the INT2 line for a specific application.
So far we have no success.
This little note may help you to a starting point
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