CMX865 CML Microcircuits, CMX865 Datasheet - Page 24

• Manufacturer Part Number: CMX865
• Description: FSK Modem and DTMF Codec
• Manufacturer: CML Microcircuits

FSK Modem and DTMF Codec
© 2005 CML Microsystems Plc
Rx Mode Register b5-3: Rx USART Setting (Rx Modem Modes)
These three bits select the Rx USART operating mode.
Rx Mode Register b2-0: Rx Data Bits and Parity (Rx Start-Stop Modes)
In Rx Start-stop mode these three bits select the number of data bits (plus any parity bit) in each
received character. These bits are ignored in Rx Synchronous mode.
Rx Mode Register b2-0: Tones Detect Mode
In Tones Detect Mode (Rx Mode Register b14-12 = 001) b8-3 should be set to 000000. These
three bits select the detector type.
b5
b2
b2
1
1
1
0
1
1
1
1
0
0
0
0
1
0
0
0
0
b4
b1
b1
1
1
0
x
1
1
0
0
1
1
0
0
0
1
1
0
0
b3
b0
b0
1
0
1
0
1
0
1
0
1
0
0
1
0
1
0
x
x
Rx Synchronous mode
Rx Start-stop mode
Reserved
Rx USART function disabled
8 data bits + parity
8 data bits
7 data bits + parity
7 data bits
6 data bits + parity
6 data bits
5 data bits + parity
5 data bits
Programmable Tone Pair Detect
Call Progress Detect
2100Hz, 2225Hz Answer Tone Detect
DTMF Detect
Disabled
24
CMX865
D/865/3