73k322l ETC-unknow, 73k322l Datasheet - Page 14

• 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
TONE REGISTER
BIT NO.
D3, D2,
D1, D0
(cont.)
D4
D5
D6
D7
011
TR
OUTPUT
CONTR.
RXD
D7
Transmit Answer
Transmit DTMF
Calling Tone
TX Guard or
RXD Output
(continued)
Control
NAME
Tone
TRANSMIT
CALLING
GUARD/
TONE
D6
TRANSMIT
ANSWER
TONE
CONDITION
D5
0
1
0
1
0
1
0
1
TRANSMIT
DTMF
D4
14
DESCRIPTION
Disable DTMF.
Activate
transmitted continuously when this bit is high. TX DTMF
overrides all other transmit functions.
Disables answer tone generator.
Enables answer tone generator. A 2100 Hz answer tone
will be transmitted continuously when the transmit enable
bit is set. The device must be in Answer mode.
transmit answer tone, the device must be in DPSK
Answer mode.
Disables guard/calling tone generator.
Transmit guard tone if in V.22 and answering; otherwise
transmit calling tone, in any other mode including V.23
mode.
Enables RXD pin. Receive data will be output on RXD.
Disables RXD pin. The RXD pin reverts to a high
impedance with internal weak pull-up resistor.
EQUIVALENT
KEYBOARD
DTMF 3
C
D
A
B
8
9
0
#
*
D3
DTMF.
V.23 FDX
DTMF 2/
The
D3 D2 D1 D0
D2
1
1
1
1
1
1
1
1
0
DTMF CODE
0
0
0
0
1
1
1
1
0
selected
0
0
1
1
0
0
1
1
0
DTMF 1/
SPEED
OVER-
0
1
0
1
0
1
0
1
0
D1
DTMF
LOW
852
852
941
941
941
697
770
852
941
TONES
G.T./ANSW./
tones
SP. TONE/
DTMF 0/
SELECT
HIGH
1336
1477
1336
1209
1477
1633
1633
1633
1633
D0
are
To