Telephone Signalling Transceiver / Least Cost Router
CMX860
1.5.12.4
Receive Mode Register: 16-bit write-only.
This register controls the CMX860 receive signal type and level.
Receive Mode Register
'C-BUS' address $E2
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:
Rx mode = modem
Rx level
Eq
Set to 00
Start-stop/Synch
No. of bits and
parity
Rx mode = Tones detect
Rx mode = Disabled
Rx level
DTMF/Tones/Call Progress select
Set to 0000 0000 0000
Rx Mode Register b15-12: Rx mode
These 4 bits select the receive 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
1200 bps
75 bps
1200 bps
150 bps
DTMF, Programmed tone pair, Answer Tone, Call Progress detect
Receiver disabled
Rx Mode Register b11-9: Rx level
These three bits set the gain of the Rx Gain 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
26
D/860/5
CMLMICRO [ CML MICROCIRCUITS ]
