CMX860 查看數據表（PDF） - MX-COM Inc
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CMX860 Datasheet PDF : 36 Pages
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Telephone Signaling Transceiver
18
CMX860 Advance Information
4.12.3 Transmit Mode Register: 16-bit write-only ($E1)
This register controls the CMX860 transmit signal type and level. All bits of this register are cleared to 0 by a
General Reset command, in Powersave mode, or when b7 (Reset) of the General Control Register is 1.
Bit:
15 14 13 12
Tx mode = modem
Tx mode = DTMF/Tones
Tx mode = Disabled
11 10 9
Tx level
Tx level
8
7
6
5
4
3
2
1
0
set to 00
set to 00
Start-stop /
synch data
# data bits /
synch data source
Unused, set to 0000
DTMF or Tone select
Set to 0000 0000 0000
Tx Mode
Bit 15-12
Tx Level
Bit 11-9
RESERVED
Bit 8-5
Tx Data Format
(both FSK
modes)
Bit 4-3
Tx Data and
Stop Bits
(FSK Start-stop
mode)
Bit 2-0
These 4 bits select the transmit operating mode.
b15 b14 b13 b12
0
1
0
1 V.23 FSK
0
1
0
0 V.23 FSK
0
0
0
1 DTMF / Tones
0
0
0
0 Transmitter disabled
These 3 bits set the gain of the Tx Level Control block.
b11 b10 b9
1
1
1
1
1
0
1
0
1
1
0
0
0
1
1
0
1
0
0
0
1
0
0
0
0dB
-1.5dB
-3.0dB
-4.5dB
-6.0dB
-7.5dB
-9.0dB
-10.5dB
Reserved, set to 0000
1200bps
75bps
These two bits select Synchronous or Start-stop mode and the addition of a parity bit to
transmitted characters in Start-stop mode.
b4 b3
1 1 Synchronous mode
1 0 Start-stop mode, no parity
0 1 Start-stop mode, even parity bit added to data bits
0 0 Start-stop mode, odd parity bit added to data bits
In Start-stop mode these three bits select the number of Tx data and stop bits
b2 b1 b0
1 1 1 8 data bits, 2 stop bits
1 1 0 8 data bits, 1 stop bit
1 0 1 7 data bits, 2 stop bits
1 0 0 7 data bits, 1 stop bit
0 1 1 6 data bits, 2 stop bits
0 1 0 6 data bits, 1 stop bit
0 0 1 5 data bits, 2 stop bits
0 0 0 5 data bits, 1 stop bit
¤2000 MX-COM, Inc.
www.mxcom.com tel: 800 638 5577 336 744 5050 fax: 336 744 5054
Doc. # 20480222.001
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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