The Lite edition of the Proton Development Suite is a special version of our fully-fledged Proton Development Suite. As a standalone product, the Lite Edition is a free and fully functional, non-expiring download which includes the Compiler, the IDE and the ISIS Simulator. It's limited to 50 lines of code and the 12C508, 12F675, 16F628A and 16F877 PICmicro's.