73K224BL
V.22bis, V.22, V.21, Bell 212A, 103
Single-Chip Modem w/ Integrated Hybrid
DATA SHEET
TONE REGISTER
TR
D7
D6
D5
D4
D3
D2
D1
D0
ADDR
011
RXD
OUTPUT
CONTROL
TRANSMIT
GUARD
TONE
TRANSMIT
ANSWER
TONE
TRANSMIT
DTMF
DTMF 3
DTMF 2/
4-WIRE
FDX
DTMF 1/
EXTENDED
OVER-
DTMF 0/
ANSWER
GUARD
SPEED
BIT
NAME
CONDITION
DESCRIPTION
D0 interacts with bits D6, D5, and D4 as shown
D3, D2,
D1, D0
DTMF 3,
2, 1, 0
Programs 1 of 16 DTMF tone pairs that will be transmitted
when TX DTMF and TX enable bit (CR0, bit D1) is set.
Tone encoding is shown below:
DTMF CODE
D3 D2 D1 D0
KEYBOARD
EQUIVALENT
TONES
HIGH
LOW
697
697
697
770
770
770
852
852
852
941
941
941
697
770
852
941
1
2
3
4
5
6
7
8
9
0
*
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1209
1336
1477
1209
1336
1477
1209
1336
1477
1336
1209
1477
1633
1633
1633
1633
#
A
B
C
D
D4
TX DTMF
0
1
Disable DTMF.
(Transmit
DTMF)
Activate DTMF. The selected DTMF tones are transmitted
continuously when this bit is high. TX DTMF overrides all
other transmit functions.
NOTE: DTMF0-DTMF2 should be set to an appropriate state after DTMF dialing to avoid unintended operation.
Page: 15 of 33
© 2005, 2008 TERIDIAN Semiconductor Corporation
Rev 7.1
TERIDIAN [ TERIDIAN SEMICONDUCTOR CORPORATION ]
