mahmood Elnasser wrote:
"as far as I remember you cant use keil simulator for eval version."

This is certainly not true of the current Keil Eval version; the limitations are stated here: http://www.keil.com/demo/limits.htm

mahmood Elnasser also wrote:
"The way to learn is make a project, then read the datasheet"

Nooooooooooooooo!!!
Data sheet first; then project!

Too impatient you are!