73K324L
CCITT V.22bis,V.23,V.22,V.21, Bell 212A
Single-Chip Modem
DATA SHEET
TONE REGISTER
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/
G.T./ANSW./
CALLING/SCT
TONE/SEL
TR
011
WIRE
FDX
BIT NO.
NAME
CONDITION
DESCRIPTION
D0, D4, D5, D6 DTMF
0/Guard
D6 D5 D4 D0 D0 interacts with bits D6, D5, D4, and CR0 as shown.
X
1
X
0
1
0
X
0
Transmit DTMF tones (overrides all other functions).
Tone/Answer
Select 1800 Hz guard tone if in V.22bis or V.22 and
Answer mode in CR0.
Tone/Calling/
SCT Tone/
Transmit
1
0
0
1
Select 550 Hz guard tone if in V.22bis or V.22 and
Answer mode in CR0.
Select
Note: Bit D0 also selects the answer tone detected in Originate mode, see
Detect Register Special Tone Detect (bit D2) for details.
1
X
X
1
0
1
1
0
0
0
0
0
0
0
1
1
1300 Hz calling tone will be transmitted if V.22, V.22bis or
V.23 Originate mode is selected in CR0.
Transmit 2225 Hz Answer Tone. Must be in DPSK
Answer mode.
Transmit 2100 Hz Answer Tone. Must be in DPSK
Answer mode.
900 Hz SCT (soft carrier turnoff) tone transmitted in V.23
75 bit/s Receive mode. (CR0 bit D0 = 1).
D1
D2
DTMF 1/
Overspeed
D4
D1
0
D1 interacts with D4 as shown.
0
0
Asynchronous QAM/DPSK +1% -2.5%. (Normal).
1
Asynchronous QAM/DPSK, 2400, 1200 or 600 bit/s
+2.3% -2.5%. (Extended overspeed).
DTMF 2/
4 WIRE
FDX
D4
0
D2
0
Selects 2-wire full-duplex or half-duplex.
0
1
D2 selects 4 wire full duplex in the Modulation mode
selected. The receive path corresponds to the ANS/ORIG
bit CR0 D0 in terms of high or low band selection. The
transmitter is in the same band as the receiver, but does
not have magnitude filtering or equalization on its signal
as in the receive path.
NOTE: DTMF0 - DTMF2 should be set to an appropriate state after DTMF dialing to avoid unintended
operation.
Page: 12 of 30
© 2005, 2008 TERIDIAN Semiconductor Corporation
Rev 7.1
TERIDIAN [ TERIDIAN SEMICONDUCTOR CORPORATION ]
