microcontroller

hello friends.. what is the code(number followed by PIC) of microcontroller we use in general robotics applications?

for example.. if i just want my bot to move front in a line..?i studied little about microcontrollers but i am not sure about the code of the microcontrollers for desired aplications

recommend maybe the PIC16F628A, loads of tutorials on the net for the outdate PIC16F84 that you could easily adapt to run on the 628A
If you go to www.microchip.com you can comparison shop for PICs there to find what features you exactly want for your project.