CMX867E2 View Datasheet(PDF) - CML Microsystems Plc
Part Name
Description
MFG CO.
'CMX867E2' PDF : 48 Pages View PDF
Low Power V.22 Modem
CMX867
1.5.10.4 Receive Mode Register
Receive Mode Register: 16-bit write-only. C-BUS address $E2
This register controls the CMX867 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.
Bit: 15 14 13 12
Rx mode = modem
Rx mode = Tones detect
Rx mode = Disabled
11 10 9
Rx level
Rx level
8
7
6
5
4
3
2
1
0
Eq Descrambl Start-stop/Synch
No. of bits and
parity
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
1 1 1 1 Receiver disabled
(Reserved for future use)
1 1 1 0 Receiver disabled
(Reserved for future use)
1 1 0 1 V.22/Bell 212A 1200 bps DPSK High band (Calling modem)
1100
“
Low band (Answering modem)
1 0 1 1 V.22 600 bps DPSK
High band (Calling modem)
1010
“
Low band (Answering modem)
1 0 0 1 V.21 300 bps FSK
High band (Calling modem)
1000
“
Low band (Answering modem)
0 1 1 1 Bell 103 300 bps FSK
High band (Calling modem)
0110
“
Low band (Answering modem)
0 1 0 1 V.23 FSK
1200 bps
0100
“
75 bps
0 0 1 1 Bell 202 FSK
1200 bps
0010
“
150 bps
0 0 0 1 DTMF, Programmed tone pair, Answer Tone, Call Progress detect
0 0 0 0 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
0dB
1
1
0 -1.5dB
1
0
1 -3.0dB
1
0
0 -4.5dB
0
1
1 -6.0dB
0
1
0 -7.5dB
0
0
1 -9.0dB
0
0
0 -10.5dB
© 2004 Consumer Microcircuits Limited
26
D/867/5
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