Telephone Signalling Transceiver / Least Cost Router
CMX860
Tx Mode Register b8-5: Reserved, set to 0000
Tx Mode Register b4-3: Tx Data Format (both FSK modes)
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
0
0
1
0
1
0
Synchronous mode
Start-stop mode, no parity
Start-stop mode, even parity bit added to data bits
Start-stop mode, odd parity bit added to data bits
Tx Mode Register b2-0: Tx Data and Stop bits (FSK Start-stop mode)
In Start-stop mode these three bits select the number of Tx data and stop bits.
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, 2 stop bits
8 data bits, 1 stop bit
7 data bits, 2 stop bits
7 data bits, 1 stop bit
6 data bits, 2 stop bits
6 data bits, 1 stop bit
5 data bits, 2 stop bits
5 data bits, 1 stop bit
Tx Mode Register b2-0: Tx Data source (FSK Synchronous mode)
In Synchronous mode (b4-3 = 11) these three bits select the source of the data fed to the Tx
FSK modulator.
b2
b1
b0
1
0
0
0
x
1
1
0
x
1
0
x
Data bytes from Tx Data Buffer
Continuous 1s
Continuous 0s
Continuous alternating 1s and 0s
ã 2002 Consumer Microcircuits Limited
24
D/860/5
CMLMICRO [ CML MICROCIRCUITS ]
