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ST75C520 Datasheet(PDF) 21 Page - STMicroelectronics

Part # ST75C520
Description  HIGH SPEED FAX MODEM DATA PUMP
PDF  45 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST75C520 Datasheet(HTML) 21 Page - STMicroelectronics

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DSIT
Define Status Interrupt
DSIT
Opcode:
13
00010011
Synopsis
DSIT specifies the bit mask used with the STATUS[0] and STATUS[1] byte to generate an
interrupt IT4 to controller. Each time a bit change happens in the status words, assuming
the corresponding bit mask will be set, an interrupt will be generated.
Parameters
Field
Byte
Pos.
Value
Definition
STA_IT_MSK0
1
7..0
Status[0] bit mask pattern
STA_IT_MSK1
2
7..0
Status[1] bit mask pattern
Notes :
The default IT Status is 0x3F for STATUS[0] and 0xFF for STATUS[1].
FORM
Select Transmission Format
FORM
Opcode:
09
00001001
Synopsis
FORM defines the type of transmission used. This format is valid only in the parallel data
mode. The default format, unless specified, is synchronous.
Parameters
Field
Byte
Pos.
Value
Definition
X_SYNC
1
1..0
00*
01
10
11
Synchronous format
Transmit continous ”1”
(1)
HDLC framing
Transmit continous ”0”
(1)
Notes :
1. This format is only valid for the transmiter.
HSHK
Handshake
HSHK
Opcode:
04
00000100
Synopsis
HSHK is used to command the ST75C520 to begin the transmit handshake sequence
processing. The progress of the handshake is reported to the control processor.
Parameter
Non parametric command.
IDT
Identify
IDT
Opcode:
14
00010100
Synopsis
IDT Return the ST75C520 Hardware and Software release number. See paragraph VII.1.4.
Parameter
Non parametric command.
INIT
Initialization
INIT
Opcode:
06
00000110
Synopsis
INIT forces the ST75C520 to reset all parameters to their default conditions and restart
operations.
Parameter
Non parametric command.
Notes :
This command makes a software reset of the ST75C520 and so cannot have the regular handshake protocol. It does
not increment the COMACK, neither generate an Interrupt.
ST75C520
21/45



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