73K224L
V.22bis, V.22, V.21, Bell 212A, 103
Single-Chip Modem
DATA SHEET
TONE REGISTER (continued)
D7
D6
D5
D4
D3
D2
D1
D0
RXD
OUTPUT
CONTR.
TRANSMIT
GUARD
TONE
TRANSMIT
ANSWER
TONE
TRANSMIT
DTMF
DTMF 3
DTMF 2/4
WIRE FDX
DTMF 1/
EXTENDED
OVER- SPEED
DTMF 0/
ANSWER
GUARD
TR
011
BIT NO.
NAME
CONDITION
DESCRIPTION
D3, D2,
D1, D0
DTMF 3,
2, 1, 0
D4 = 1
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:
KEYBOARD
EQUIVALENT
DTMF CODE
D3 D2 D1 D0
TONES
LOW
HIGH
1209
1336
1477
1209
1336
1477
1209
1336
1477
1336
1209
1477
1633
1633
1633
1633
1
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
697
697
697
770
770
770
852
852
852
941
941
941
697
770
852
941
2
3
4
5
6
7
8
9
0
*
#
A
B
C
D
D4
TX DTMF
(Transmit
DTMF)
0
1
Disable 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: 13 of 31
© 2005, 2008 TERIDIAN Semiconductor Corporation
Rev 7.1
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