ST75C520 datasheet(19/45 Pages) STMICROELECTRONICS

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CONF

Configure for Operations

CONF

Opcode

00100000

Synopsis

CONF allows the complete definition of the ST75C520 operation, including the mode of

operation (tone, FAX transmit, FAX receive, voice transmit, voice receive, DTMF receive, ...)

and the modem parameters (standard, speed, ...).

Parameters

Field

Byte

Pos.

Value

Definition

CONF_OPER

3..0

Mode of operation, see below

CONF_ANAL

Normal mode

Analog loop back (test mode only)

CONF_PSTN

PSTN (carrier detect set to -43/-48dBm)

Leased line (carrier detect -33/-38dBm)

CONF_AO

Answer mode (FSK full duplex only)

Originate mode (FSK full duplex only)

CONF_V24

Do not use RTS pin signal

Use RTS pin signal

CONF_MODE

5..0

Other

Bell 103 (full duplex)

V.21 (full duplex)

V.23 (full duplex)

V.27ter

V.29

V.17

V.33 (half duplex)

V.21 channel 2

Reserved

CONF_TXEQ

7..6

No transmit equalizer

Transmit equalizer #1

Transmit equalizer #2

Transmit equalizer #3

CONF_CAR

1800Hz carrier (V.17/V.33 only)

1700Hz carrier (V.17/V.33 only)

CONF_SP0

7..5

xx1

x1x

1xx

2400bps allowed (V.27)

4800bps allowed (V.27, V.29)

7200bps allowed (V.29, V.17)

CONF_SP1

2..0

xx1

x1x

1xx

9600bps allowed (V.29, V.17)

12000bps allowed (V.17, V.33)

14400bps allowed (V.17, V.33)

According with the 4 first bits of the CONF_OPER the ST75C520 is put into the following

mode of operation.

CONF_OPER

Transmit

Received

0000*

Tones

0010

Voice

Tones

0100

Tone

DTMF

0110

Voice

DTMF

1000

Tones

Voice

1010

Voice

1111

Modem

Other

Not allowed

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