I think there is a lot of overreaction here from both sides.

Shivani has formulated his problem in his very first posting:

Given is the following, indeed very simple program (i stripped the unnecesary definitions) - I doubt THIS needs any comment for a seasoned '51 programmer:

org 0000h
        ljmp program_start ;bypass interupt table       
org 0030h                
program_start:
        mov port3,#0ffh
        mov port1,#0ffh
        mov r0,#7fh
fill_zeros:
      mov @r0,#00h
      djnz r0,fill_zeros 
system:
      jb port3.2,system
      mov port1,#00h
here:
       sjmp here
end

The supposed function WAS stated in Shivani's very first posting:


And also the problem description is there:


He even made some steps to clear the problems himself, but got confused:


What else would you expect from him for the initial posting, except some formatting?

Jan Waclawek

PS. Shivani, as I said, please post here both hex or binary files exactly as you burned into the microcontroller - the listing might be useless, too.