Anyone knows of a keypad peripheral for keil? I'm trying to emulate the hardware environment, and it will be very helpful to use one...
"for Keil" is a bit vague - do you mean something to work in or with the uVision Simulator?
I don't know of anything ready-made, but this would be the place to start: http://www.keil.com/support/man/docs/uv3/uv3_simulation.htm
http://www.keil.com/support/man/docs/uv3/uv3_debug_functions.htm