Memories.

If you're interested in this sort of thing there is one book you should read: Arm System on Chip by Steve Furber (original designer of the ARM)

http://www.amazon.com/ARM-System---Chip-Architecture-Edition...

OK. These are the two books you need when you start out programming for ARM chips:

ARM System-on-Chip Architecture (2nd Edition) By Steve Furber (the guy who designed the bloody chip!) http://www.amazon.com/ARM-System-Chip-Architecture-2nd/dp/02...

ARM Architecture Reference Manual (2nd Edition) By David Seal http://www.amazon.com/ARM-Architecture-Reference-Manual-2nd/...