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ST7540 数据表(PDF) 20 Page - STMicroelectronics

部件名 ST7540
功能描述  FSK power line transceiver
PDF  44 Pages
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制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

ST7540 数据表(HTML) 20 Page - STMicroelectronics

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Functional description
ST7540
20/44
Figure 6.
Synchronous and Asynchronous ST7540/Host Controller interfaces
ST7540 allows to interface the Host Controller using a five line interface (RxD,TxD,RxTx,
CLR/T, & REG_DATA) in case of Synchronous mains access or using a 3 line interface
(RxD,TxD & RxTx) in Asynchronous mains access. Since Control Register is not accessible
in Asynchronous mode, in this case REG_DATA pin must be tied to GND.
6.5.1
Communication between Host and ST7540
The Host can achieve the Mains access by selecting REG_DATA=”0” and the choice
between Data Transmission or Data Reception is performed by selecting RxTx line (if RxTx
=“1” ST7540 receives data from mains, if RxTx=”0” ST7540 transmits data over the mains).
Communication between Host and ST7540 is different in Asynchronous and Synchronous
mode:
●
Asynchronous mode:
In Asynchronous Mode, data are exchanged without any data Clock reference. The
host controller has to recover the clock reference in receiving Mode and control the Bit
time in transmission mode.
If RxTx line is set to “1” & REG_DATA=”0” (Data Reception), ST7540 enters in an Idle
State. After Tcc time the modem starts providing received data on RxD line.
If RxTx line is set to “0” & REG_DATA=”0” (Data Transmission), ST7540 enters in an
Idle State and transmission circuitry is switched on. After Tcc time the modem starts
transmitting data present on TxD line.
RxD
CLR/T
REG_DATA
RxTx
ST7540
Host Controller
TxD
UART/Asynchronous
Data Interface
RxD
CLR/T
REG_DATA
RxTx
ST7540
Host Controller
TxD
SPI/Synchronous
Data Interface
D03IN1415



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