W925E240 Datasheet, PDF (61/73 Pages) Winbond – 8-BIT CID MICROCONTROLLER

W925E/C240
Application Environment
There are three major timing differences for CID sequences, Bellcore, BT and CCA. Figure 7-2 is the
timing diagram for Bellcore on-hook data transmission and Figure 7-3 is the timing diagram for the
Bellcore off-hook data transmission. Figure 7-4 is the timing diagram for the BT caller display service
on-hook data transmission and Figure 7-5 is the timing diagram for the BT caller display service off-
hook data transmission. Figure 7-6 is the timing diagram for the CCA caller display service for on-hook
data transmission. The CID flag (CIDF) must be cleared by software when each time the CID interrupt
routine is serviced. The CID global enable signal (CIDE) must be set high.
Tip/Ring
CIDF
1st Ring
Ch. seizure Mark Message
A
B
C
D
E
F
...
...
2nd Ring
RNG
FSKE
FCD
FDR
FCLK
FDATA
...
...101010...
...
A = 2 sec typical
B = 250-500mS
C = 250mS
D = 150mS
Data
E = depend on data length
MAX C+D+E = 2.9 TO 3.7 sec
F >= 200mS
Figure 7-2 Input and Output Timing of Bellcore On-hook Data Transmission
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Publication Release Date: July 12, 2005
Revision A10