I would say only about 1% of your problem is solved. Where do you buy these magic chips? Surely they would like to help you. Or maybe all the secrets are in the dev kit. Many manufacturers expect that if you're designing in their chip that you can afford to buy the dev kit.

Going back to your original post about the 'registers' - I did not find any reference to these in the link you posted to the pdf. I did find reference to reading/writing flash and various other parameters. Again, read the data CAREFULLY - it has the secrets in there (we hope at least). Remove any expectations of how you think it SHOULD work and let the datasheet tell how it DOES work.