73k222al ETC-unknow, 73k222al Datasheet - Page 13

• Manufacturer Part Number: 73k222al
• Description: V.22, V.21, Bell 212a, Single-chip Modem
• Manufacturer: ETC-unknow

TONE REGISTER
TR
011
BIT NO.
D3, D2,
D1, D0
D4
D5
RXD
OUTPUT
CONTR.
D7
Answer Tone
DTMF 3,
Transmit
Transmit
NAME
2, 1, 0
TRANSMIT
GUARD
TONE
DTMF
D6
TRANSMIT
ANSWER
TONE
D3 D2 D1 D0
D5
0
1
0
1
1
CONDITION
D5
0
1
D4
0
0
0
0
1
0
1
D0
X
0
1
TRANSMIT
DTMF
0
1
D4
13
DESCRIPTION
Programs 1 of 16 DTMF tone pairs that will be
transmitted when TX DTMF and TX enable bit (CR0, bit
D1) are set. Tone encoding is shown below:
Disable DTMF.
Activates
transmitted continuously when this bit is high. TX DTMF
overrides all other transmit functions.
D5 interacts with bits D4 and D0 as shown.
Disables answer tone generator.
Enables answer tone generator. A 2225 Hz answer tone
will be transmitted continuously when the Transmit
Enable bit is set in CR0. The device must be in answer
mode.
Likewise a 2100 Hz answer tone will be transmitted.
EQUIVALENT
KEYBOARD
A
B
C
D
DTMF 3
1
2
3
4
5
6
7
8
9
0
#
*
V.22, V.21, Bell 212A, 103
D3
DTMF.
Single-Chip Modem
DTMF 2
D3 D2 D1 D0
The
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
DTMF CODE
D2
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
selected
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
DTMF 1/
OVER-
SPEED
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
73K222AL
D1
DTMF
TONES
LOW
697
697
697
770
770
770
852
852
852
941
941
941
697
770
852
941
DTMF 0/
ANSWER/
GUARD
tones
D0
HIGH
1209
1336
1477
1209
1336
1477
1209
1336
1477
1336
1209
1477
1633
1633
1633
1633
are