HI Frandz,
Thanks for the reply I have written a code for the frequency counter,it is like this
the P3.3(t0) is kept for the counting purpose of frequncy
and it is in the 16 bit mode mode1
the timmer t1 is kept for the delay purose. whne the counting is completed an intrept is genearated, This will maek the counting stop and the 16 bit data is stored in the TL0 and TH0
and it wil be hex value of the unknown frequency which is devided by 10.
now i wil write the lookup table but i am in little bit confusion to write the lookup table, just c the code does it ok, or not pls correct it if it have nay mistake
************** progrm starts here freq.asm*********

frqflag equ 0Fh
freq:
org 0000h
mov sp,#30h
sjmp over

org 001bh
setb psw.3
inc r0
cjne r0,#00h,checktime
inc r1
checktime:
cjne r1,#03h,goback
cjne r0,#0e8h,goback
clr tr0
clr tr1
setb frqflag
goback:
clr psw.3
reti

;;; main progrmme starts here

over:

mov Tcon,#00h ;clear all timers stopped - flag reset
setb psw.3 ;select reg,bank 1 and reset r0, and r1
mov r0,#00h
mov r1,#00h
clr psw.3 ;return to bank 0
mov tmod,#25h ; t1 a mode2 counter as timer, and t0 a mode 1 -16 bit counter
mov tl1,#9ch ; tl1 strts countdown from 9c=156
mov th1,#9ch ; th1 will overload 156= 9c
mov tl0,#00h
mov th0,#00h
clr frqflg
mov Tcon,#50h
mov ie,#88h
sim:
jbc frqflag,getfrq
sjmp sim

getfrq:
mov R6,tl0 ; show freq. count in hex on p1 & p2,whichis p1, p2 == unknonfreq/10
mov R7,th0 ; P1 ->LSB and P2-> MSB

; look up table
lowbyte equ 0200h
highbyte equ 0300h
mov dptr,#lowbyte
mov a,@a+dptr
////***** here what vlues i wan 2 give***////

sjmp over
end