ORG 00H
LJMP MAIN      
ORG 002BH
LJMP T2ISR

MAIN:

MOV P1,#0FFH
MOV IE,#0A0H
MOV T2CON,#04H    ;//Initialising Timer 2 as in 16bit auto- 
MOV T2MOD,#02H      reload mode 
SETB TF2
SJMP $

T2ISR:

CLR TR2
MOV TH2,#-1000
MOV TL2,#-1000
SETB TR2
CPL P1.6  
RETI
END