UM0934 datasheet(36/113 Pages) STMICROELECTRONICS

tên linh kiện	UM0934

Giải thích chi tiết về linh kiện	ST7570 S-FSK power line networking System-on-Chip

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Host interface

UM0934

36/113

Doc ID 17389 Rev 2

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)

9600

19200

38400

57600

UART

Local Port

TXD

RXD

T_REQ

BR1

BR0

External UART

Baudrate

selection

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