You probably have one already but if not you are welcome to this 68 page datasheet from signetics which contains some nice info of bus timing along with the usual instruction set / status flags
http://devzone.wsnw.net/downloads/pdf/68000.pdf
68000 datasheet
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I have two documents in PDF wich I got from manufacturer site: "MOTOROLA M68000 FAMILY Programmer’s Reference Manual (Includes CPU32 Instructions)" (1,7MB) ans "M68000 8-/16-/32-Bit Microprocessors User’s Manual" (1,3MB). In UM info about bus cycles and pinouts. In PM all about opcodes, clocks and etc. That is all what you need about M68K family. You can find it here.