CMX624 데이터 시트보기 (PDF) - MX-COM Inc

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CMX624

Bell 202 and V.23 Modem with Call Progress and DTMF

MX-COM Inc  

Bell 202 and V.23 Compatible Modem

6

CMX624 Preliminary Information

4 General Description

The CMX624 contains a Bell 202 and V.23 compatible FSK modem. This device is capable of duplex

operation at 1200/75bps or 1200/150bps over a 2-wire line interface. It is also capable of 1200/1200bps over

a 4-wire line interface. This device also contains a flexible FSK data UART, a receive FSK or Call Progress

Tone energy detector, a 2100Hz detector, a DTMF generator, a Tx line driving buffer amplifier, a telephone

line Ringing Signal or Line Voltage Reversal detector and a 3.579545MHz Xtal oscillator. These functions are

controlled via a serial interface to the µC, which also carries the transmit and receive FSK modem data.

4.1 ‘C-BUS’ Serial Interface

This block provides for the transfer of data and control or status information between the CMX624’s internal

registers and the µC over the serial interface bus. Each ‘C-BUS’ transaction consists of a single Register

Address byte sent from the µC, as illustrated in Figure 3, which may be followed by either of:

1. A single data byte sent from the µC to be written into one of the CMX624’s Write Only Registers, as

illustrated in Figure 4.

2. A single byte of data read out from one of the CMX624’s Read Only Registers, as illustrated in Figure 5.

Data sent from the µC on the Command Data line is clocked into the CMX624 on the rising edge of the Serial

Clock input. Reply Data sent from the CMX624 to the µC is valid when the Serial Clock is high. The interface

is compatible with the most common µC serial interfaces such as SCI, SPI and Microwire, and may also be

easily implemented with general purpose µC I/O pins controlled by a simple software routine. See Figure 16

for detailed Serial Bus timing requirements.

CS

SERIAL CLOCK

COMMAND DATA

765432 10

REPLY DATA

Address (01 Hex = Reset)

Hi-Z

Note:

The SERIAL CLOCK

line may be high or low at

the start and end of each

transaction.

= Level not important

Figure 3: Serial Bus Transaction (Single byte from µC)

CS

SERIAL CLOCK

COMMAND DATA

765432 10

Address

REPLY DATA

Hi-Z

765432 10

Data to CMX624

Figure 4: Serial Bus Transactions (One Address and one Data byte from µC)

CS

SERIAL CLOCK

COMMAND DATA

765432 10

Address

REPLY DATA

Hi-Z

765432 10

Data from CMX624

Figure 5: Serial Bus Transactions (One Address byte from µC and one Reply byte from CMX624A)

©1999 MX-COM, Inc.

www.mxcom.com Tel: 800 638 5577 336 744 5050 Fax: 336 744 5054

Doc. # 20480180.108

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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