Tomas,
may I suggest the book "Designing Embedded Hardware" by O'Reilly. It's not
as thorough as some other books on the subject, but it gives a nice overview
of the basics of embedded circuits - how crystals/piezos work, layout,
common devices, bypass filters, etc.
There's a website associated with it here:
http://oreilly.com/catalog/9780596007553/
Rgds,
- Marcel
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