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UM0934 Datasheet(PDF) 36 Page - STMicroelectronics

Part # UM0934
Description  ST7570 S-FSK power line networking System-on-Chip
PDF  113 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

UM0934 Datasheet(HTML) 36 Page - STMicroelectronics

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Host interface
UM0934
36/113
Doc ID 17389 Rev 2
5
Host interface
The host interface is a communication port used by the external host to exchange data with
the ST7570.
The host interface consists of a local port (a standard UART), a communication protocol,
and a set of commands exchanged between ST7570 and the external host. It manages the
communication and arbitration on the local port, and provides access to all the ST7570
internal services.
5.1
UART
The local communication is a half duplex asynchronous serial link (UART) using a receiving
input (RXD), a transmitting output (TXD), and a T_REQ signal to manage the
communication.
The connection diagram of the ST7570 using UART as the host interface port is shown in
Figure 13
:
Figure 13.
ST7570 and external host: UART connections
The communication baud rate is selected after the ST7570 reset, in accordance with the
status of local input ports BR0 and BR1 listed in Table 9:
Table 9.
UART baud rate
BR1
BR0
Baud rate (b/s)
0
0
9600
0
1
19200
1
0
38400
1
1
57600
UART
Local Port
TXD
RXD
T_REQ
BR1
BR0
External UART
Baudrate
selection



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