73K222BL
V.22, V.21, Bell 212A, 103 Single-Chip
Modem with Integrated Hybrid
DATA SHEET
DETECT REGISTER (continued)
D7
D6
D5
D4
D3
D2
D1
D0
DR
010
X
X
RECEIVE
DATA
UNSCR.
MARK
CARR.
DETECT
ANSWER
TONE
CALL
PROG.
LONG
LOOP
BIT NO.
NAME
CONDITION
DESCRIPTION
D2
Answer Tone
Detect
0
1
No answer tone detected.
Indicates detection of 2225 Hz answer tone in Bell
modes or 2100 Hz in CCITT modes. The device must
be in originate mode for detection of answer tone. For
CCITT answer tone detection, bit D0 of the Tone
Register must be set to a 1.
D3
D4
Carrier Detect
0
1
No carrier detected in the receive channel.
Indicates carrier has been detected in the receive
channel.
Unscrambled
Mark Detect
0
1
No unscrambled mark.
Indicates detection of unscrambled marks in the
received data.
A valid indication requires that
unscrambled marks be received for > 165.5 ± 6.5 ms.
D5
ReceiveData
Not Used
Continuously outputs the received data stream. This
data is the same as that output on the RXD pin, but it
is not disabled when RXD is tri-stated.
D6, D7
Undefined
Not used. Mask in software.
TONE REGISTER
D7
D6
D5
D4
D3
D2
D1
D0
TR
011
RXD
OUTPUT
CONTR.
TRANSMIT TRANSMIT TRANSMIT DTMF 3 DTMF 2 DTMF 1/
DTMF 0/
ANSWER/
GUARD
GUARD
TONE
ANSWER
TONE
DTMF
OVER-
SPEED
BIT NO.
NAME
CONDITION
DESCRIPTION
D0
DTMF 0/
Answer/
Guard Tone
D6 D5 D4 D0 D0 interacts with bits D6, D5, and D4 as shown.
X
X
X
X
X
1
X
0
1
0
1
0
0
1
0
0
0
0
0
0
X
0
0
1
1
0
1
Transmit DTMF tones.
Detects 2225 Hz in originate mode.
Transmits 2225 Hz in answer mode (Bell).
Detects 2100 Hz in originate mode.
Transmits 2100 Hz in answer mode (CCITT).
Select 1800 Hz guard tone.
1
Select 550 Hz guard tone.
D1
DTMF 1/
Overspeed
D4 D1
D1 interacts with D4 as shown.
Asynchronous DPSK +1.0% -2.5%.
Asynchronous DPSK +2.3% -2.5%.
0
0
0
1
Page: 12 of 26
© 2005, 2008 TERIDIAN Semiconductor Corporation
Rev 7.2
TERIDIAN [ TERIDIAN SEMICONDUCTOR CORPORATION ]
