ST75C540 datasheet(24/84 Pages) STMICROELECTRONICS

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VI.1.3 - Host Interface Summary

Address (hex)

Description

Size (Byte)

Mnemonic

COMMAND AREA

$00

Command

COMSYS

$01-$04

Command Parameters

COMPAR[0..3]

REPORT AREA

$05

Acknowledge Counter

COMACK

$06-$07

Report

COMREP[0..1]

STATUS AREA

$08

Error Status

SYSERR

$09-$0A

General Status

STATUS[0..1]

$0B

Quality Monitor

STAQUA

$0C-$0F

Optional Report

STAOPT[0..3]

DATA BUFFER AREA (FAX Modes and Data Modes)

$1C

Data Rx Buffer 0 Status

DTRBS0

$1D-$24

Data Rx Buffer 0

DTRBF0[0..7]

$25

Data Rx Buffer 1 Status

DTRBS1

$26-$2D

Data Rx Buffer 1

DTRBF1[0..7]

$2E

Data Tx Buffer 0 Status

DTTBS0

$2F-$36

Data Tx Buffer 0

DTTBF0[0..7]

$37

Data Tx Buffer 1 Status

DTTBS1

$38-$3F

Data Tx Buffer 1

DTTBF1[0..7]

VOCODER BUFFER AREA (Vocoder Mode)

$1C

Vocoder Buffer Status

VOCSTA

$1D-$2E

Vocoder Buffer Data

VOCDATA

$2F-$30

Vocoder Buffer Corrector

VOCCORR

INTERRUPT AREA

$40-$46

Reset Interrupt Register

ITREST[0..6]

$4F

Interrupt Mask Register

ITMASK

$50

Interrupt Source Register

ITSRCR

GENERAL IO AND RELAY

$60

I/O Direction 0

IODIR0

$61

I/O Direction 1

IODIR1

$62

I/O Data 0

IODATA0

$63

I/O Data 1

IODATA1

$64

I/O Relay Register

IORELAY

Note : Registers which address is higher or equal to $40 are not affected by a INIT Command or a Low Power wake-up. They are reseted

only by a Hardware RESET.

VI - USER INTERFACE (continued)

ST75C530 - ST75C540

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