In SX Microcontrollers, SX/B Compiler and SX-Key Tool, George Herzog wrote:

I got my copy of Guenther's text in November 2004.  I am still re-reading it nearly daily.
It is necessary to have someone point out all the details and pitfalls.

But after you get into the SXes, 
you may want to read more from www.sxlist.com as there are things that Guenter could not cover in a tutorial text. 

Mutiple threads is one topic he doesn't discuss.  
And while SX-Ubicom's material presents it, they assume you have substatial background knowledge.
In my case I don't and I have to scramble for answers on the Internet.

A related topic is semaphores.
The use of 'flag bits' to help create a working finite state machine.

Together, they really can make the SXes much more than a communications device or a motor controller.  You can combine many functions in one package.

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