ST75C520PQFP View Datasheet(PDF) - STMicroelectronics
Part Name
Description
MFG CO.
'ST75C520PQFP' PDF : 45 Pages View PDF
ST75C520
CONF
Opcode
Synopsis
Parameters
Configure for Operations
20
0
0
1
0
0
0
0
0
CONF
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, ...).
Field
CONF_OPER
CONF_ANAL
CONF_PSTN
CONF_AO
CONF_V24
CONF_MODE
Byte
1
1
1
1
1
2
CONF_TXEQ
2
CONF_CAR
3
CONF_SP0
3
CONF_SP1
4
Pos.
3..0
4
5
6
7
5..0
7..6
0
7..5
2..0
Value
-
0
1
0
1
0
1
0
1
1
3
4
7
8
9
C
D
Other
0
1
2
3
0
1
xx1
x1x
1xx
xx1
x1x
1xx
Definition
Mode of operation, see below
Normal mode
Analog loop back (test mode only)
PSTN (carrier detect set to -43/-48dBm)
Leased line (carrier detect -33/-38dBm)
Answer mode (FSK full duplex only)
Originate mode (FSK full duplex only)
Do not use RTS pin signal
Use RTS pin signal
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
No transmit equalizer
Transmit equalizer #1
Transmit equalizer #2
Transmit equalizer #3
1800Hz carrier (V.17/V.33 only)
1700Hz carrier (V.17/V.33 only)
2400bps allowed (V.27)
4800bps allowed (V.27, V.29)
7200bps allowed (V.29, V.17)
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
0000*
0010
0100
0110
1000
1010
1111
Other
Transmit
Tones
Voice
Tone
Voice
Tones
Voice
Modem
Not allowed
Received
Tones
Tones
DTMF
DTMF
Voice
Voice
Modem
Not allowed
19/45
Share Link: 
