73k322l ETC-unknow, 73k322l Datasheet - Page 12

• Manufacturer Part Number: 73k322l
• Description: Ccitt V.23, V.22, V.21 Single-chip Modem
• Manufacturer: ETC-unknow

CCITT V.23, V.22, V.21
Single-Chip Modem
DETECT REGISTER
BIT NO.
D0
D1
D2
D3
D4
D5
D6, D7
010
DR
D7
Carrier Detect
Call Progress
Receive Data
Unscrambled
Special Tone
Long Loop
NAME
Detect
Detect
D6
Mark
RECEIVE
DATA
D5
CONDITION
0
1
0
1
0
1
0
1
0
1
UNSCR.
MARK
D4
12
(1) 2100 Hz answer tone if D0 of TR=1 and the device is
(2) 1300 Hz calling tone if D0 of TR=1 and the device is
(3) An FSK mark if D0 of TR = 0.
DESCRIPTION
Indicates normal received signal.
Indicates low received signal level.
No call progress tone detected.
Indicates presence of call progress tones. The call
progress detection circuitry is activated by energy in the
normal 350 to 620 Hz call progress band.
No special tone detected as programmed by CR0 bit D0
and Tone Register bit D0.
Special tone detected. The detected tone is:
No carrier detected in the receive channel.
Indicated carrier has been detected in the received
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.
DETECT
in V.21 or V.22 originate mode.
in V.21, or V.22 answer mode.
Tolerance on special tones is ±3%.
CARR.
D3
SPECIAL
TONE
D2
PROG.
CALL
D1
LONG
LOOP
D0