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Re:Future instruction set: AVX-512 by xradionut on Wednesday October 09, 2013 @12:58PM (#6522393)
There's more structured material for MIPS than AVR. Plus the AVR has some funky memory maps and modes.
Re:Future instruction set: AVX-512 by StephenFalken on Wednesday October 09, 2013 @01:19PM (#6522524)
This all time classic from MIPS is a good starting point: "MIPS R4000 Microprocessor User's Manual" [1]

[1] http://groups.csail.mit.edu/cag/raw/documents/R4400_Uman_boo...