73K324L
CCITT V.22bis,V.23,V.22,V.21, Bell 212A
Single-Chip Modem
DATA SHEET
TONE REGISTER (continued)
D7
D6
D5
D4
D3
D2
D1
D0
RXD
OUTPUT
CONTR.
TRANSMIT
GUARD/
CALLING/SCT
TONE
TRANSMIT
ANSWER
TONE
TRANSMIT
DTMF
DTMF 3 DTMF 2/
DTMF 1/
OVER-
SPEED
DTMF 0/
GUARD/
CALLING/SCT
TONE SEL
TR
011
WIRE
FDX
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 D1, D02,
1, 0 transmitted when TX DTMF and TX enable bit (CR0,
bit D1) is set. Tone encoding is shown below:
KEYBOARD
DTMF CODE
TONES
EQUIVALENT
D3 D2 D1 D0
LOW HIGH
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
697
697
697
770
770
770
852
852
852
941
941
941
697
770
852
941
1209
1336
1477
1209
1336
1477
1209
1336
1477
1336
1209
1477
1633
1633
1633
1633
#
A
B
C
D
D7
RXD Output
Control
0
1
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.
Page: 13 of 30
© 2005, 2008 TERIDIAN Semiconductor Corporation
Rev 7.1
TERIDIAN [ TERIDIAN SEMICONDUCTOR CORPORATION ]
