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ST7538P データシート(PDF) 11 Page - STMicroelectronics

部品番号 ST7538P
部品情報  POWER LINE FSK TRANSCEIVER
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メーカー  STMICROELECTRONICS [STMicroelectronics]
ホームページ  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST7538P データシート(HTML) 11 Page - STMicroelectronics

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ST7538
Host Processor Interface
ST7538 exchanges data with the host processor thorough a serial interface.
The data transfer is managed by REG_DATA and RxTx Lines, while data are exchanged using RxD, TxD
and CLR/T lines.
Four are the ST7538 working modes:
s
Data Reception
s
Data Transmission
s
Control Register Read
s
Control Register Write
REG_DATA and RxTx lines are level sensitive inputs.
Table 4.
s
Mains Access
ST7538 features two type of communication interfaces:
- Asynchronous
- Synchronous
The selection can be done through the internal Control Register.
Figure 1.
– Asynchronous Mode.
ST7538 allows to interface the Host Controller using a 3 line interface (RXD,TXD & RxTx).
Data are exchange without any auxiliary Clock reference in an Asynchronous mode without adding any
protocol bits. The host controller has to recover the clock reference in receiving Mode and control the Bit
time in transmission mode. RxD line is forced to a low logic level when no carrier is detected.
REG_DATA
RxTx
Data Transmission
0
0
Data Reception
0
1
Control Register Read
1
1
Control Register Write
1
0
RxD
CLR/T
REG_DATA
RxTx
ST7538
Host Controller
TxD
Asynchronous
Data Interface
RxD
CLR/T
REG_DATA
RxTx
ST7538
Host Controller
TxD
Synchronous
Data Interface
D03IN1415


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