If I am right it keeps executing NOP until it runs out of memory and then again executes MAIN routine , is it?

I just put the routine at end of my program.
modified code and it seems it has solved my problem.

Can you please explain me the Blunder
$mod51

;**O/P
S1 EQU P3.0
S2 EQU P3.1
;*****Delay routine delaration*****
VAR1 EQU R0
VAR2 EQU R1
VAR3 EQU R2

;*************************************************

ORG 0000H
SJMP MAIN
MAIN:
CLR S1
CALL DELAY
SETB S1
CALL DELAY
CLR S1

ORG 200H
;****1Sec Delay routine****************
DELAY:
MOV VAR3,#8
MOV VAR2,#8
MOV VAR1,#236
TT1:
DJNZ VAR1,TT1
DJNZ VAR2,TT1
DJNZ VAR3,TT1
RET
;****End of Delay routine ****************

END