hello I sent you the following link of the video of the simulation in proteus of the symmetric source with pic 16f877a, and you will see that the values of the voltages and negative flash a lot and do not remain fixed.
I know that the replacement of pic 16f877a is pic 16f887, and I want this same code to work with pic 16f887.
In addition, this was a work that I presented at the university in my digital electronic subject and obtained a 4.0 as final work.
Here I leave the link
https://drive.google.com/file/d/1jlS...ew?usp=sharing


And thanks again


José