CMX868E2 View Datasheet(PDF) - MX-COM Inc
Part Name
Description
MFG CO.
'CMX868E2' PDF : 43 Pages View PDF
Low Power V.22bis Modem
19
CMX868 Advance Information
General Control Register b7: Reset
Setting this bit to 1 resets the CMX868’s internal circuitry, clearing all bits of the Transmit and
Receive Mode Registers and b15 and b13-0 of the Status Register.
b7 = 1
Internal circuitry in a reset condition.
b7 = 0
Normal operation
General Control Register b6: IRQ EN ( IRQ Output Enable)
Setting this bit to 1 enables the IRQ output pin.
b6 = 1
b6 = 0
IRQ pin driven low (to VSS) if the IRQ bit of the Status Register = 1
IRQ pin disabled (high impedance)
General Control Register b5-0: IRQ Mask bits
These bits affect the operation of the IRQ bit of the Status Register as described in Section 4.10.7.
4.10.3 Transmit Mode Register: 16-bit write-only C-BUS address $E1
This register controls the CMX868 transmit signal type and level. All bits of this register are cleared to 0 by a
General Reset command, in Powersave mode, or when Bit 7 (Reset) of the General Control Register is 1.
Bit: 15 14 13 12 11 10 9 8
7
6
5
4
3
2
1
0
Tx mode = modem
Tx level
Guard tone Scrambler Start-stop /
# data bits /
synch data synch data source
Tx mode = DTMF/Tones
Tx level
Unused, set to 0000
DTMF or Tone select
Tx mode = Disabled
Set to 0000 0000 0000
Tx Mode Register Bits 15-12: Tx mode
These 4 bits select the transmit operating mode.
b15 b14 b13 b12
1 1 1 1 V.22bis 2400bps QAM
1110“
1 1 0 1 V.22/Bell 212A 1200bps DPSK
1100“
1 0 1 1 V.22 600bps DPSK
1010“
1 0 0 1 V.21 300bps FSK
1000“
0 1 1 1 Bell 103 300bps FSK
0110“
0 1 0 1 V.23 FSK
0100“
0 0 1 1 Bell 202 FSK
0010“
0 0 0 1 DTMF / Tones
0 0 0 0 Transmitter disabled
High band (Answering modem)
Low band (Calling modem)
High band (Answering modem)
Low band (Calling modem)
High band (Answering modem)
Low band (Calling modem)
High band (Answering modem)
Low band (Calling modem)
High band (Answering modem)
Low band (Calling modem)
1200bps
75bps
1200bps
150bps
¤2001 MX-COM, Inc.
www.mxcom.com tel: 800 638 5577 336 744 5050 fax: 336 744 5054
Doc. # 20480205.007
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA
All trademarks and service marks are held by their respective companies.
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