73K324L-28IH ETC, 73K324L-28IH Datasheet - Page 13

• Manufacturer Part Number: 73K324L-28IH
• Description: CCITT V.22bis/ V.22/ V.21/ V.23/ Bell 212A Single-Chip Modem
• Manufacturer: ETC

TONE REGISTER
BIT NO.
D3, D2,
D1, D0
D7
011
TR
OUTPUT
CONTR.
RXD
D7
(continued)
RXD Output
DTMF 3, 2,
CALLING/SCT
Control
NAME
TRANSMIT
1, 0
GUARD/
TONE
D6
CONDITION
TRANSMIT
ANSWER
TONE
D4 = 1
D5
CCITT V.22bis, V.22, V.21, V.23, Bell 212A
0
1
TRANSMIT
DTMF
D4
13
DESCRIPTION
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:
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
A
B
C
D
1
2
3
4
5
6
7
8
9
0
#
*
DTMF 3
D3
DTMF 2/
D3 D2
WIRE
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
FDX
D2
DTMF CODE
Single-Chip Modem
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
D1 D0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
DTMF 1/
SPEED
OVER-
D1
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
LOW
697
697
697
770
770
770
852
852
852
941
941
941
697
770
852
941
73K324L
CALLING/SCT
TONES
TONE SEL
DTMF 0/
GUARD/
D0
HIGH
1209
1336
1477
1209
1336
1477
1209
1336
1477
1336
1209
1477
1633
1633
1633
1633