參數(shù)資料
型號(hào)： ST75C540FP-A
廠商： 意法半導(dǎo)體
英文描述： SUPER INTEGRATED DEVICESWITH DSP, AFE & MEMORIES FORTELEPHONY,MODEM, FAXOVERINTERNET& POTSLINES
中文描述： 超級(jí)綜合DEVICESWITH數(shù)字信號(hào)處理器，模擬前端
文件頁(yè)數(shù)： 46/84頁(yè)
文件大小： 599K
代理商： ST75C540FP-A
VIII.2.3- Modem General Status
Themodemgeneralstatuswordis composedof twobytes STATUS[0]andSTATUS[1].Anybit changecan
generatean IT4interrupt. Usingthe DSITcommand allows the selectionof the corresponding bit that will
generatean interrupt each time they will change. The default pattern is $3F for STATUS[0] and $FF for
STATUS[1].
The differentbits have the following meaning :
STATUS[0]
Field
Pos.
0
Meaning when set
STA_109
STA_VAD
In FAXMODEM and TONECID modes STA_109: CCITT Circuit109 (CarrierDetect). Indicates
that valid data are received.
In CODER and DECODER modes : VAD: Voice Activity Detected
CCITT Circuit 107 (Data Set Ready). Valid only in FAX & DATA MODEM modes.
CCITT Circuit 106 (Clear To Send). Indicates that the training sequence has been completed
and that any data in the Transmit Bufferwill betransmitted. Valid only in FAX & DATA MODEM
modes.
Ring Detected. A valid ring signal is present at the Ring pin. Valid only in Tones modes. The
precise frequency can be read in the optional status byte STAOP2.
In TONE and TONECID modes STA_CPT0: Call progress tone detector #0. Low pass filter
650Hz.
In TONE and TONECID modes STA_CPT1: Call progress tone detector #1. High pass filter
600Hz.
In TONE and TONECID modes STA_CPT10: Signal in Filter #0 is higher than #1.
In FAX MODEM mode, V.22bismode* and TONECID mode STA_109F: Fast Carrier Detect.
STA_107
STA_106
1
2
STA_RING
3
STA_CPT0
4
STA_CPT1
5
STA_CPT10
STA_109F
6
7
* ST75C540only
STATUS[1]
Field
Pos.
0
1
2
Meaning
STA_H
STA_TIM*
STA_CCITT
Transmit synchronisation in progress. Valid only in FAX & DATA MODEM modes.
Handshake timeout. Valid only in Data Modem mode.
CCITT 2100Hz versus 2225Hz answer tone detect. Valid if STA_AT is set. Valid only in Tone
mode.
Answer tone (either 2100Hz or 2225Hz)detected. Valid only inTone mode.
STA_HR : Receive synchronisation in progress. Valid only in Fax Modem mode.
STA_RTRN : Remote retrain detec, valid only in V.32bis/V.32/V.22bis Data Modem modes.
Remote rate negotiation detected, valid only inV.32bis/V.32/V.22bis Data Modem modes.
STA_FLAG : V.21 channel 2 flag detect. Valid only in FAX Modem mode and Tone mode.
STA_CLR : Remote clear down detected V.32bis/V.32 Data Modem modes.
DTMF digit detect. The digititself is availablein the optional status byte STAOP3.
STA_AT
STA_HR
STA_RTRN*
STA_RENEG*
STA_FLAG
STA_CLR*
STA_DTMF
3
4
5
6
7
* ST75C540only
VIII - STATUS DESCRIPTION
(continued)
ST75C530 - ST75C540
46/84
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