68HC11 Instruction Set and Reference Manual

Here is a link to 68HC11 Instruction Set (that you can use to look up the instructions):
http://www.ele.uri.edu/Courses/ele205/6811-Instructions/index.html

Here is a link to complete reference Manual for 68HC1, if you want to learn more details about each instruction:
http://www.freescale.com/files/microcontrollers/doc/ref_manual/M68HC11RM.pdf