CMX869E2 View Datasheet(PDF) - CML Microsystems Plc
Part Name
Description
MFG CO.
'CMX869E2' PDF : 46 Pages View PDF
Low Power V.32 bis Modem
CMX869
Tx Mode Register b8-7: Tx Guard tone (V.22 bis mode)
These 2 bits select the guard tone to be transmitted together with the highband (answer)
V.22 bis signal. Ignored in all other modes.
b8
b7
1
1
Tx 550Hz guard tone
1
0
Tx 1800Hz guard tone
0
x
No Tx guard tone
Tx Mode Register b6: Tx Modem 2-Character mode
Selects whether the Tx Data Register operates in 1 or 2 character mode.
B6
1
2 character mode
0
1 character mode
Tx Mode Register b5: Reserved, set to 0
Tx Mode Register b4-3: Tx Modem Data format
These two bits select Special or Start-stop mode and the addition of a parity bit to transmitted
characters in Start-stop mode.
b4
b3
1
1
Special modes (see below)
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
Tx Mode Register b2-0: Tx Modem Data and Stop bits (Start-Stop modes)
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
Tx Mode Register b2-0: Tx Modem Data source (Special modes)
When b4-3 = 11 bits 2-0 select the source of the Transmitted data as below:
b2 b1 b0
1
1
1 Synchronous , data bytes taken directly from the Tx Data Buffer
1
1
0 HDLC mode
1
0
x Reserved, do not use.
0
1
1 Continuous 1s
0
1
0 Continuous 0s
0
0
1 Continuous alternating 1s and 0s
0
0
0 Reserved, do not use.
© 2003 CML Microsystems Plc
23
D/869/1
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