Freescale Semiconductor - Division of Motorola focused on semiconductor production. Contains information on the 680x0 family of CPUs used in Amiga computers. - http://www.freescale.com/
Wikipedia: Motorola 68000 - Article covering the history, architecture and instructions sets of the 68000 processor used in the A500 and A1000 machines. - http://en.wikipedia.org/wiki/Motorola_68000