73k224bl ETC-unknow, 73k224bl Datasheet - Page 15

• Manufacturer Part Number: 73k224bl
• Description: Single-chip Modem Integrated Hybrid
• Manufacturer: ETC-unknow

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