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
Rx Mode Register b8-7: Reserved, set to 00
Rx Mode Register b6: Rx Modem 2-Character mode
Selects whether the Rx Data Register operates in 1 or 2 character mode
B6
1
2 character mode
0
1 character mode
Rx Mode Register b5-3: Rx Modem Data format
These three bits select the Rx modem USART operating mode. The 1% and 2.3% overspeed
options apply to QAM modes only.
b5 b4 b3
1
1
1 Rx Special modes
1
1
0 Rx Start-stop mode, no overspeed
1
0
1 Rx Start-stop mode, +1% overspeed (1 in 8 missing Stop bits allowed)
1
0
0 Rx Start-stop mode, +2.3% overspeed (1 in 4 missing Stop bits allowed)
0
x
x Rx USART function disabled
Rx Mode Register b2-0: Rx Modem Data bits and Parity (Start-Stop modes)
In Start-stop mode these three bits select the number of data bits (plus any parity bit) in each
received character.
b2 b1 b0
1
1
1 8 data bits + parity
1
1
0 8 data bits
1
0
1 7 data bits + parity
1
0
0 7 data bits
0
1
1 6 data bits + parity
0
1
0 6 data bits
0
0
1 5 data bits + parity
0
0
0 5 data bits
Rx Mode Register b2-0: Rx Modem Data bits and Parity (Special modes)
When b5-3 = 111 bits 2-0 select special receive modes as below:
b2 b1 b0
1
1
1 Synchronous, received bits transferred directly to Rx Data Register
1
1
0 HDLC mode
1
0
X Reserved, do not use.
0
x
x Reserved, do not use.
Rx Mode Register b2-0: Tones Detect mode
In Tones Detect Mode (Rx Mode Register b15-12 = 0001) b8-3 should be set to 000000.
Bits 2-0 select the detector type.
b2 b1 b0
1
0
0 Programmable Tone Pair Detect
0
1
1 Call Progress Detect
0
1
0 2100, 2225Hz Answer Tone Detect
0
0
1 DTMF Detect
0
0
0 Disabled
© 2003 CML Microsystems Plc
26
D/869/1
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