ST75C540 datasheet(45/84 Pages) STMICROELECTRONICS

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Starting at the adddress $08 the status area have the following format :

Add.

Name

Bit

432

$08

SYSERR ERR_RTK

ERR_IPRM

ERR_IOCD ERR_VOCO ERR_RX

ERR_TX

$09 STATUS0 STA_109F STA_CPT10 STA_CPT1

STA_CPT0

STA_RING

STA_106

STA_107 STA_109

STA_VAD

$0A STATUS1 STA_DTMF STA_FLAG

STA_CLR*

STA_RNEG

STA_HR

STA_RTRN*

STA_AT

STA_CCITT

STA-TIM

STA_H

$0B

STAQUA

Quality

$0C

STAOP0

Depend on operating mode (see below)

$0D

STAOP1

$0E

STAOP2

$0F

STAOP3

* ST75C540 only

VIII.2.2 - Error Status

The error status changes each time an error occurs. When the ST75C530/540 signals an error by setting

one of the SYSERR bit, it generates an interrupt IT0. These bits can only be cleared by the host controler

using the CSE command.

The meaning of the different bits of the SYSERR byte is discribed below :

SYSERR

Field

Pos.

Meaning when set

ERR_TX

Transmit buffer underflow. Loss of synchronisation between the host and ST75C530/540 transmit

data buffer managment.

ERR_RX

Receive buffer overflow. Loss of synchronisation between the host and ST75C530/540 receive

data buffer managment.

ERR_VOCO

Vocoder buffer underflow (Decoder) or overflow (Coder). Lost of synchronisation between the

Host and ST75C530/540 VOCODER Buffer management.

ERR_IOCD

Incorrect command

ERR_IPRM

Incorrect parameter for the command

ERR_RTK

Real time kernel error. ST75C530/540 not able to perform all its tasks within the baud period

(transmit or receive samples lost).

VIII - STATUS DESCRIPTION (continued)

ST75C530 - ST75C540

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