Telephone Signalling Transceiver / Least Cost Router
CMX860
1.5.12.3
Transmit Mode Register
Transmit Mode Register: 16-bit write-only. 'C-BUS' address $E1
This register controls the CMX860 transmit signal type and level. All bits of this register are cleared to 0
by a General Reset command, or when b7 (Reset) of the General Control Register is 1.
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Bit:
Tx mode = modem
Tx level
set to 00
set to 00
Start-stop /
synch data
# data bits /
synch data source
Tx mode = DTMF/Tones
Tx mode = Disabled
Tx level
Unused, set to 0000
Set to 0000 0000 0000
DTMF or Tone select
Tx Mode Register b15-12: Tx mode
These 4 bits select the transmit operating mode.
b15 b14 b13 b12
0
0
0
0
0
0
1
1
0
0
0
0
0
0
1
1
0
0
1
0
1
0
1
0
V.23 FSK
V.23 FSK
Bell 202 FSK
Bell 202 FSK
DTMF / Tones
Transmitter disabled
1200 bps
75 bps
1200 bps
150 bps
Tx Mode Register b11-9: Tx level
These 3 bits set the gain of the Tx Level Control block.
b11
b10
b9
1
1
1
1
0
0
0
0
1
1
0
0
1
1
0
0
1
0
1
0
1
0
1
0
0dB
-1.5dB
-3.0dB
-4.5dB
-6.0dB
-7.5dB
-9.0dB
-10.5dB
ã 2002 Consumer Microcircuits Limited
23
D/860/5
CMLMICRO [ CML MICROCIRCUITS ]
