i wrote the assembly code for counting the no. of pulses from the reflective targets.i would like you all to give suggestions on that

START: mov TMOD, #01100000B ; counter 1, mode 2, C/T=1
mov TH1, #0 ;count from 0x00 to 0xFF
setb P3.5 ;configure P3.5 as input
AGAIN: setb TR1 ;enable counter
BACK: mov A, TL1 ;read TL1 value
mov P2, A ;display it on P2
jnb TF1, back ;poll for TF1, could use INT1 also
clr TR1 ;stop counter
clr TF1 ;clear TF1 flag
sjmp AGAIN ;while(1)