CMX867D2 CML Microcircuits, CMX867D2 Datasheet - Page 21

• Manufacturer Part Number: CMX867D2
• Description: Low power V.22 modem
• Manufacturer: CML Microcircuits

Low Power V.22 Modem
1.5.10.3
Transmit Mode Register: 16-bit write-only.
This register controls the CMX867 transmit signal type and level. All bits of this register are cleared to 0
by a General Reset command, in Powersave mode, or when b7 (Reset) of the General Control Register
is 1.
2001 Consumer Microcircuits Limited
Bit:
Tx Mode Register b15-12: Tx mode
These 4 bits select the transmit operating mode.
b15
Tx Mode Register b11-9: Tx level
These 3 bits set the gain of the Tx Level Control block.
15
Tx mode = DTMF/Tones
b11
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
1
1
1
1
0
0
0
0
Transmit Mode Register
Tx mode = Disabled
Tx mode = modem
b14
14
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
b10
1
1
0
0
1
1
0
0
13
b13
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
12
b9
b12
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
11
Transmitter disabled
Transmitter disabled
V.22/Bell 212A 1200 bps DPSK
V.22 600 bps DPSK
V.21 300 bps FSK
Bell 103 300 bps FSK
V.23 FSK
Bell 202 FSK
DTMF / Tones
Transmitter disabled
-1.5dB
-3.0dB
-4.5dB
-6.0dB
-7.5dB
-9.0dB
-10.5dB
0dB
Tx level
Tx level
10
9
C-BUS address $E1
Guard tone
“
“
“
“
“
“
8
Set to 0000 0000 0000
Unused, set to 0000
21
7
Scrambler
6
5
(Reserved for future use)
(Reserved for future use)
High band (Answering modem)
Low band (Calling modem)
High band (Answering modem)
Low band (Calling modem)
High band (Answering modem)
Low band (Calling modem)
High band (Answering modem)
Low band (Calling modem)
1200 bps
75 bps
1200 bps
150 bps
Start-stop /
synch data
4
DTMF or Tone select
3
synch data source
2
# data bits /
1
0
CMX867
D/867/2