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ST75C520 数据表(PDF) 22 Page - STMicroelectronics

部件名 ST75C520
功能描述  HIGH SPEED FAX MODEM DATA PUMP
PDF  45 Pages
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制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

ST75C520 数据表(HTML) 22 Page - STMicroelectronics

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JSR
Call a Low Level Subroutine
JSR
Opcode:
18
00011000
Synopsis
JSR allows to execute a part of the ST75C520 firmware with a specific argument.
Parameters
Field
Byte
Pos.
Value
Definition
C_ADDR_L
1
7..0
Low byte of the call address
C_ADDR_H
2
7..0
High byte of the call address
C_DATA_L
3
7..0
Low byte of the argument
C_DATA_H
4
7..0
High byte of the argument
MODC
Modify Configuration
MODC
Opcode:
21
00100001
Synopsis
MODC allows modification of the configuration for special purpose. This command has no
effect while in data mode, the parameters are just sampled when starting to transmit or
receive. The value of these parameters are not affected when sending a CONF command.
Parameters
Field
Byte
Pos.
Value
Definition
MODC_SH
1
6
0*
1
Normal training sequence
Short training
(1) sequence
MODC_FPT
2
3..2
00*
01
10
No echo protection tone
Long echo protection tone (180ms)
Short echo protection tone (30ms)
Notes :
1. Short train sequence must be preceded by at least one normal training sequence.
MR
Memory Read
MR
Opcode:
10
00010000
Synopsis
MR allows the reading of a 16-bit parameter. The parameter specifies the parameter
address.
Parameters
Field
Byte
Pos.
Value
Definition
MR_ADDR_L
1
7..0
Low byte of the 16-bit address
MR_ADDR_H
2
7..0
High byte of the 16-bit address
MW
Memory Write
MW
Opcode:
12
00010010
Synopsis
MW allows the writing of a 16-bit parameter. The parameter specifies the address as well
as the value to be transferred.
Parameters
Field
Byte
Pos.
Value
Definition
MW_ADDR_L
1
7..0
Low byte of the 16-bit address
MW_ADDR_H
2
7..0
High byte of the 16-bit address
MW_VALUE_L
3
7..0
Low byte of the 16-bit value
MW_VALUE_H
4
7..0
High byte of the 16-bit value
ST75C520
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