Hello Flavio,
In this case I would like to recommend the application note AN4570.
Understanding S08P Flash and EEPROM - AN4570
This application note presents an introduction of this module, and then details on how to use it with demo code provided.
The demo code is developed with CodeWarrior for MCU v10.2, and unfortunately, it is in C language. You can use the disassembly option at CodeWarrior.
I hope this information will be useful for you.
If I misunderstood your question, feel free to let me know. I will be glad to help.
Have a great day.
David Diaz.
