Hi all,
I'm working on a 'cid manager'. I use motorola MC145447 and i think i did it the way datasheet tells. So far it can receive cid information fine with delay about 5 secs between each call. but it seems going unpredictable if receiving simultanous calls. Any suggestion why it happens? Since the motorola can detect bell-ring, i use that to detect the beginning of cid streams.

this is part of my detection software:
ON_HOOKED: ;idle condition
JB BIT_HOOK, OFF_HOOKED ;or wait for off-hook
JMP ON_HOOKED

OFF_HOOKED: ;handset is taken off or ringing ?
CLR EX0 ;disable time display
CLR TR0
CLR ET0
CLR ES
CLR TF0
CLR REN
CLR RI
CLR TI
CALL DELAY_50MS
CALL DELAY_50MS
CALL DELAY_50MS
CALL DELAY_50MS
CALL DELAY_50MS
CALL DELAY_50MS

DETECT_RING:
JNB BIT_RING, FIRST_RING ;maybe it's ringing
CALL DELAY_50MS
CALL DELAY_50MS
CALL DELAY_50MS
CALL DELAY_50MS
CALL DELAY_50MS
CALL DELAY_50MS
JB BIT_HOOK, GOING_OFF_HOOKED
SETB EX0
JMP ON_HOOKED

GOING_OFF_HOOKED: ;or it's off_hooked
CALL EMPTY_BUFFER ;fill buffer with space
MOV A,#BARIS2 ;outgoing messages on line 2
MOV DPTR, #MSG_OUTGOING
CALL DISPMSG
MOV A, #BARIS2
CALL LCDI
CLR FDIGIT ;detect odd digit first
MOV R0, #CLIP_BUFFER
JMP DETECT_MORE

;;incoming call detection
FIRST_RING: ;if it's the 1st ring coming in
CALL INITBGCLIP
MOV SCON, #72H
CLR RI
SETB REN
MOV IE, #00H

bla..
bla..