Telephone Signalling Transceiver / Least Cost Router
CMX860
Rx Mode Register b8-6: Reserved, set to 000
Rx Mode Register b5-3: Rx USART Setting (both FSK modes)
These three bits select the Rx USART operating mode.
b5
b4
b3
1
1
0
1
1
x
1
0
x
Rx Synchronous mode
Rx Start-stop mode
Rx USART function disabled
Rx Mode Register b2-0: Rx Data bits and parity (FSK Start-stop mode)
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
1
0
0
0
0
1
1
0
0
1
1
0
0
1
0
1
0
1
0
1
0
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
Rx Mode Register b2-0: Rx Data bits and parity (FSK Synchronous mode)
These bits are ignored in Synchronous mode.
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
0
0
0
1
1
0
0
0
1
0
1
0
Programmable Tone Pair Detect
Call Progress Detect
2100, 2225Hz Answer Tone Detect
DTMF Decode
Disabled
ã 2002 Consumer Microcircuits Limited
27
D/860/5
CMLMICRO [ CML MICROCIRCUITS ]
