This book is very complete and well thought out.
It covers most if not all of the many HCS08 processors.
This book explains all you would need to know to write in assembly, but is not a tutorial on assembly language (nor should it be). It has a review of "C" but is not a "C" tutorial either.
Having said that most of the many, many examples are written in "C", are available for download, and are actively maintained by the author. It is worth the cost just for the examples - many of which are explained in the text.
Module by module, each register is explained in detail, every bit. For the most part, you would not need to look at the specsheet when programming. This book is both a tutorial and a reference guide you will want to keep it on your desk when programing. I am very experienced with the HCS08, but I know this book will be at my side while I program, as I can't remember every detail. This book has many handy charts that are easier to find and use than in the spec sheet. For the few times I need to use assembly language, this book will be a great reference, as it document all the instructions. Instead of having to look in several places, this is an all in one reference.
It also explains in detail how to use Codewarrior and the debugger from Freescale, which can be downloaded for free. For about 50.00 USD, you could buy this book and demo a board and be ready for a great learning experience, professional or hobbyist.
After covering all the modules - system, clocking, communication, flash, low power and io it also has a section on projects examples and schematics are shown as well for building prototypes.
While a beginner would also need some other books to learn assembly language and "C", even a beginner would benefit from this book. Hardware engineers would also gain insight, as would professional software engineers and hobbyists.
Finally, the author monitors the Freescale forum, and will be happy to answer any question you may have. Errata is constantly being updated as well.
Plus it is at a great price.