73k224bl ETC-unknow, 73k224bl Datasheet - Page 16

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

73K224BL
V.22bis/V.22/V.21/Bell 212A/103
Single-Chip Modem w/ Integrated Hybrid
TONE REGISTER (continued)
BIT
D5
D6
D7
ADDR
011
TR
CONTROL
OUTPUT
RXD
D7
Answer Tone
RXD Output
Guard Tone
Transmit
Transmit
Control
NAME
TRANSMIT
GUARD
TONE
D6
D5
0
1
1
CONDITION
TRANSMIT
ANSWER
TONE
D5
D4
0
0
0
0
1
0
1
D0
X
0
1
TRANSMIT
DTMF
16
DESCRIPTION
D5 interacts with bits D4 and D0 as shown. Also interacts
with DR bit D2 in originate mode (see Detect Register
description).
Disables answer tone generator.
In answer mode, a Bell 2225 Hz tone is transmitted
continuously when the transmit enable bit is set.
Likewise, a CCITT 2100 Hz answer tone is transmitted.
Disables guard tone generator.
Enables guard tone generator (see D0 for selection of
guard tones). Bit D4 must be zero.
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.
D4
DTMF 3
D3
DTMF 2/
4-WIRE
FDX
D2
EXTENDED
DTMF 1/
SPEED
OVER-
D1
ANSWER
DTMF 0/
GUARD
D0