Guys,,
i understand i will try to work hard on what you people say....iam trying to learn to use MT8816 through controller...

off-hook detection is connected at P2.0

Address Lines of MT8816

P1.0 AY0
P1.1 AY1
P1.2 AY2
P1.3 AX0
P1.4 AX1
P1.5 AX2
P1.6 AX3
P1.7 DATA

P3.5 STROBE

CS pin is permittly High

X2 Is connected with the Telephone via SLIC.

now where ever the telephone goes off hook simply X2 gets connected with Y0

using the datasheet of MT8816 i have written the following code please suggest is it rite as i have worked out this with my hardware but its not working..if some one can just tell me that its rite then i may be sure that the software has no error...

; CHECKING ONE TELEPHONE LINE WITH MT8816 AND AT89C52
; P2.0 FOR DETECTING OFF HOOK (1) AND ON HOOK (0)
; SLIC TO X2 PIN31 OF MT8816
; ADDRESS LINE + DATA PIN OF MT8816 WITH P1
; DIAL TONE IS ON Y0 PIN 31 OF MT8816



ORG 00H
MOV P3,#00000000B ;STROBE IS CLEARED
MOV P2,#00000000B ;RESETING THE PIN
MOV P1,#00000000B ;RESETING THE PIN
AJMP MAIN

LOOP:
MOV R6,#0FFH
WAIT: DJNZ R6,WAIT
RET

MAIN:
OFF: JNB P2.0,OFF ;WAITING FOR OFF-HOOK
MOV P1,#10010000B ;ADDRESS LINE TO CONNECT Y0 WITH X2
SETB P3.5 ;STROBE IS SET HIGH
CALL LOOP ;Delay for strobe
CLR P3.5 ;STROBE GOES LOW
DO: SJMP DO
END