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參數(shù)資料
| 型號： | W925E240 |
| 英文描述： | Telephone Controller |
| 中文描述： | 電話控制器 |
| 文件頁數(shù)： | 50/66頁 |
| 文件大?。?/td> | 930K |
| 代理商： | W925E240 |
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W925E/C240
8-bit CID Microcontroller
Revision : A6
-50-
Release Date : 2002/7/2
CAS/DTAS Detection
In off-hook services (type II), the detection of CAS/DTAS will affect the quality of the call waiting
service. When the CAS/DTAS is sent from far end, sometimes the near end user maybe still
talking. The CPE must be able to detect the CAS/DTAS successfully in the presence of near end
speech. To detect CAS/DTAS from telephone hybrid receiver pair improves the detection.
However in BT’s on-hook CID system the CAS/DTAS detection is from Tip/Ring pair.
The dual tone alert signal is separated into high and low tones and detected by a high/low tone
detector. When the alert tone is recognized by the detector, the bit ALGO will go high and the
rising signal will set the bit ALGOF in CIDFG to produce the CID flag(CIDF). Figure 6-18 shows
the guard time waveform of detecting alert tone. The total recognition time is t
REC
=t
DP
+t
GP
, where
t
DP
is the tone present detect time and t
GP
is the tone present guard time. The total absent guard
time is t
ABS
=t
DA
+t
GA
where t
DA
is the tone absent detect time and t
GA
is the tone absent guard time.
The tone present/absent guard time is determined by guard-time timer which the input clock
period is 0.858mS. When the alert tone is detected the internal signal ALGR will be set and the
rising edge of ALGR resets the guard-time timer and the timer starts up counting from 00H. As
the content of the timer is the same as the register CASPT, the timer stops counting and the bit
ALGO will be set and the rising edge of ALGO triggers the flag ALGOF to become high. The
counting of tone absent time is similar to the counting of tone present time but the falling edge of
ALGR/ ALGO replaces the rising edge and the CASAT replaces the CASPT. The bit ALGO is
controlled by hardware only. The flag ALGOF is set by rising edge of ALGO and cleared by
software.
Vin
Dual Alert Tone Signal
ALGR
t
DP
t
GP
t
DA
t
GA
*
1: Guard time timer is reset and starts to up count from 00H.
2: Guard time timer is reset and starts to up count from 00H.
3: The content of the guard-time timer reaches the content of ASPT/ASAT.
t
REC
t
ABS
1
2
3
3
*ALGR is an internal signal in the uC.
+ Clear by software.
Figure 6-18 Guard Time Waveform of Alert Tone Signal Detection
DTMF Decoder
The DTMF decoder shares the same input pre-processor with FSK decoder. The dual tone is
separated into low group and high group by two SCFs (switched capacitor filter. The method of
DTMF detection is the same as alert tone detection. The present/absent guard time is adjusted by
registers DTMFPT/DTMFAT. As the DTMF signal is recognized and decoded, the bit DTMFD will
be set and the decoded DTMF data is stored in bit0 to bit3 of register DTMFDR. The rising edge
of DTMFD produces the flag DTMFDF. The bit DTMFD is controlled by hardware only. The flag
DTMFDF is set by rising edge of DTMFD and cleared by software.
ALGO
ALGOF
+
1
t
DP
t
DA
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| W925E240FG | 功能描述:IC MCU 8-BIT W/CID 100-PQFP RoHS:是 類別:集成電路 (IC) >> 嵌入式 - 微控制器， 系列:W925 標準包裝:250 系列:80C 核心處理器:8051 芯體尺寸:8-位 速度:16MHz 連通性:EBI/EMI，I²C，UART/USART 外圍設(shè)備:POR，PWM，WDT 輸入/輸出數(shù):40 程序存儲器容量:- 程序存儲器類型:ROMless EEPROM 大小:- RAM 容量:256 x 8 電壓 - 電源 (Vcc/Vdd):4.5 V ~ 5.5 V 數(shù)據(jù)轉(zhuǎn)換器:A/D 8x10b 振蕩器型:內(nèi)部 工作溫度:-40°C ~ 85°C 封裝/外殼:68-LCC（J 形引線） 包裝:帶卷 (TR) |
| W925E625 | 制造商:WINBOND 制造商全稱:Winbond 功能描述:8-bit CID MICROCONTROLLER |
| W925E625FG | 功能描述:IC MCU 8-BIT W/CID 160-PQFP RoHS:是 類別:集成電路 (IC) >> 嵌入式 - 微控制器， 系列:W925 標準包裝:250 系列:80C 核心處理器:8051 芯體尺寸:8-位 速度:16MHz 連通性:EBI/EMI，I²C，UART/USART 外圍設(shè)備:POR，PWM，WDT 輸入/輸出數(shù):40 程序存儲器容量:- 程序存儲器類型:ROMless EEPROM 大小:- RAM 容量:256 x 8 電壓 - 電源 (Vcc/Vdd):4.5 V ~ 5.5 V 數(shù)據(jù)轉(zhuǎn)換器:A/D 8x10b 振蕩器型:內(nèi)部 工作溫度:-40°C ~ 85°C 封裝/外殼:68-LCC（J 形引線） 包裝:帶卷 (TR) |
| W925EP01 | 制造商:WINBOND 制造商全稱:Winbond 功能描述:8-BIT CID MICROCONTROLLER |
| W925EP01FG | 制造商:WINBOND 制造商全稱:Winbond 功能描述:8-BIT CID MICROCONTROLLER |
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