org 30h 
again:nop 
mov a,50h;as an example data at address 50h 
ANl A,#01H;MASK FOR THE PIT0 
MOV 51H,A 
mov a,50h 
anl a,04h;mask for pit2 
rr a 
rr a 
cjne A,50h,again 
nop 
nop</i>
;a jmp or something is missing here 
end


Much simpler:
org 30h 
again: 
mov a,50h;as an example data at address 50h
jb acc.0,check
jb acc.2,again
jmp match
check: jnb acc.2.again
nop 
nop 
;a jmp or something is missing here 
end