CMX865 CML Microcircuits, CMX865 Datasheet - Page 23

• Manufacturer Part Number: CMX865
• Description: FSK Modem and DTMF Codec
• Manufacturer: CML Microcircuits

FSK Modem and DTMF Codec
5.10.4 Receive Mode Register
Receive Mode Register: 16-bit write-only.
This register controls the CMX865 receive 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.
© 2005 CML Microsystems Plc
Bit:
Rx Mode Register b15: Reserved, set to 0
Rx Mode Register b14-12: Rx Mode
These three bits select the receive operating mode.
b14
Rx Mode Register b11-9: Rx Level
These three bits set the gain of the Rx Gain Control block.
15
b11
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
b13
14
1
1
0
0
1
1
0
0
Tones detect
Rx mode =
Rx mode =
Rx mode =
b10
Disabled
Modem
1
1
0
0
1
1
0
0
13
b12
1
0
1
0
1
0
1
0
12
b9
Bell 103 300bps FSK
“
V.23 FSK
“
Bell 202 FSK
“
Tones detect
Receiver disabled
1
0
1
0
1
0
1
0
11
-1.5dB
-3.0dB
-4.5dB
-6.0dB
-7.5dB
-9.0dB
-10.5dB
0dB
Rx level
Rx level
10
9
Set to 0000 0000 0000
C-BUS address $E2
8
0
23
7
0
DTMF/Tones/Call Progress select
6
0
High band (Calling modem)
Low band (Answering modem)
1200bps
75bps
1200bps
150bps
Start-stop/Synch
5
4
3
2
No. of bits and
parity
1
0
CMX865
D/865/3