CMX869 View Datasheet(PDF) - CML Microsystems Plc
Part Name
Description
MFG CO.
'CMX869' PDF : 46 Pages View PDF
Low Power V.32 bis Modem
CMX869
6.4 Receive Mode Register
Receive Mode Register: 16-bit write-only. C-BUS address $E2
This register controls the CMX869 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
00
2C 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 x Reserved, do not use
1 1 0 1 Reserved, do not use
1 1 0 0 V.22, V.22 bis, V.32, V.32 bis QAM modem
1 0 1 x Reserved, do not use
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 internal 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
© 2003 CML Microsystems Plc
25
D/869/1
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