73K224BL 데이터 시트보기 (PDF) - TDK Corporation
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73K224BL Datasheet PDF : 26 Pages
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73K222BL
V.22, V.21, Bell 212A, Bell 103
Single-Chip Modem with Integrated Hybrid
DETECT REGISTER (continued)
D7
DR
010
X
BIT NO.
D6
X
NAME
D5
D4
D3
RECEIVE
DATA
UNSCR.
MARK
CARR.
DETECT
CONDITION DESCRIPTION
D2
ANSWER
TONE
D1
CALL
PROG.
D0
LONG
LOOP
D2
Answer Tone
Detect
D3
Carrier Detect
D4
D5
D6, D7
Unscrambled
Mark Detect
ReceiveData
Not Used
0
1
0
1
0
1
Undefined
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.
No carrier detected in the receive channel.
Indicates carrier has been detected in the receive
channel.
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.
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.
Not used. Mask in software.
TONE REGISTER
TR
011
BIT NO.
D0
D1
D7
D6
D5
D4
D3
D2
D1
D0
RXD TRANSMIT
OUTPUT GUARD
CONTR.
TONE
TRANSMIT
ANSWER
TONE
TRANSMIT
DTMF
DTMF 3
DTMF 2
DTMF 1/
OVER-
SPEED
DTMF 0/
ANSWER/
GUARD
NAME
CONDITION
DESCRIPTION
DTMF 0/
Answer/
Guard Tone
D6 D5 D4 D0
X X 1X
X 0 00
D0 interacts with bits D6, D5, and D4 as shown.
Transmit DTMF tones.
Detects 2225 Hz in originate mode.
X 1 0 0 Transmits 2225 Hz in answer mode (Bell).
X 0 0 1 Detects 2100 Hz in originate mode.
X 1 0 1 Transmits 2100 Hz in answer mode (CCITT).
1 0 0 0 Select 1800 Hz guard tone.
1 0 0 1 Select 550 Hz guard tone.
DTMF 1/
Overspeed
D4 D1
00
D1 interacts with D4 as shown.
Asynchronous DPSK +1.0% -2.5%.
01
Asynchronous DPSK +2.3% -2.5%.
12
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