"refer to any standard text book by [sic] K&R."

Just to clarify, I presume you mean, "any standard text book and K&R"?

Actually, "K&R" (The 'C' Programming Languge, by Kernighan & Ritchie) is more of a reference manual for the 'C' language - every 'C' programmer should have one, but I wouldn't recommend it as a text book from which to learn 'C'.

K&R does not address embedded programming.