currently I am doing a project regarding build a line follower robot, I have to program the robot with assembly language. can some one suggest me where can I get the tutorial ?

the microcontroller that I am using is PIC16F877.

 

Try here: http://www.covingtoninnovations.com/noppp/picassem2004.pdf

Then here: http://www.piclist.com/tecHREF/piclist/begin.htm