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CMX860D6

Telephone Signaling Transceiver

MX-COM Inc  

Telephone Signaling Transceiver

11

CMX860 Advance Information

4. General Description

The CMX860 transmit and receive operating modes are independently programmable.

The transmit mode can be set to any one of the following:

• V.23 modem. 1200 or 75bps FSK.

• Bell 202 modem. 1200 or 150bps FSK

• DTMF transmit.

• Single tone transmit (from a range of modem calling, answer and other tone frequencies)

• User programmed tone or tone pair transmit (programmable frequencies and levels)

• Disabled.

The receive mode can be set to any one of the following:

• V.23 modem. 1200 or 75bps FSK.

• Bell 202 modem. 1200 or 150bps FSK

• DTMF decode.

• 2100Hz and 2225Hz answer tone detect.

• Call progress signal detect.

• User programmed tone or tone pair detect.

• Disabled.

The CMX860 may also be set into a Powersave mode that disables all circuitry except for the C-BUS

interface, the Ring Detector and the Hook Detector.

4.1 Tx USART

A flexible Tx USART is provided. It can be programmed to transmit continuous patterns, Start-Stop characters

or Synchronous Data.

In both Synchronous Data and Start-stop modes the data to be transmitted is written by the µC into the 8-bit

C-BUS Tx Data Register from which it is transferred to the Tx Data Buffer.

If Synchronous Data mode has been selected the 8 data bits in the Tx Data Buffer are transmitted serially, b0

being sent first.

In Start-stop mode a single Start bit is transmitted, followed by 5, 6, 7 or 8 data bits from the Tx Data Buffer -

b0 first - followed by an optional Parity bit then - normally - one or two Stop bits. The Start, Parity and Stop

bits are generated by the USART as determined by the Tx Mode Register settings and are not taken from the

Tx Data Register.

'C-BUS' Interface

Tx Data Register

7

0

Tx data

from µC

Tx Data Buffer

Parity bit generator

Start/Stop

Tx USART

bits

USART Control

Modem bit rate clock

Continuous

patterns

Figure 7: Tx USART

To FSK

Modulator

ã2000 MX-COM, Inc.

www.mxcom.com tel: 800 638 5577 336 744 5050 fax: 336 744 5054

Doc. # 20480222.002

4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA All trademarks and service marks are held by their respective companies.

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